2005年03月, 日本鉄鋼協会 俵論文賞, 日本鉄鋼協会
池田輝之,青木健,中嶋英雄

2002年05月, 本多記念研究奨励賞, 本多記念会

Determination of the entire existence composition range of CrMnFeCoNi high-entropy alloys using sintered diffusion multiple method
Ryuta Yurishima, Ayako Ikeda, Teruyuki Ikeda, ラスト(シニア)オーサー
Materials, 2025年01月, ［査読有り］

Microstructure Optimization of Thermoelectric τ1-Al2Fe3Si3 via Graded Temperature Heat Treatments
Ryuta Yurishima; Yoshiki Takagiwa; Ayako Ikeda; Teruyuki Ikeda, ラスト(シニア)オーサー
Materials, 2024年12月, ［査読有り］

Optimization of Pore Formation Process of Lotus Aluminum by Phase Field Simulation　　　　　　　　　　　　　　　
K. Takahashi; K. Yamaguchi; Y. Sasajima; T. Ikeda
ECS Advances, 2023年08月, ［査読有り］

Pore Formation and Shape Control Simulation of Lotus Aluminum by Phase Field Method
K. Takahashi; Y. Sasajima; T. Ikeda, ラスト(シニア)オーサー
ACS Omega, 2022年04月19日, ［査読有り］

Fe–Al–Si Thermoelectric (FAST) Materials and Modules: Diffusion-Couple and Machine-Learning Assisted Materials Development
Yoshiki Takagiwa; Zhufeng Hou; Koji Tsuda; Teruyuki Ikeda; and Hiroyasu Kojima
ACS Applied Materials & Interfaces, 2021年05月21日, ［査読有り］

Evaluation of Bonding Strength and Interfacial Resistance of Diffusion-Bonded Ag/Si Interfaces
Yasutaka Hashimoto; Takafumi Kojima; Teruyuki Ikeda, 責任著者
Materials Transactions, 2021年02月19日, ［査読有り］

熱物性顕微鏡を用いたPbTe-Sb2Te3系化合物の熱浸透率分布測定　　　　　　　　　　　　　　　
伊藤 俊亮,黒江 怜史,西 剛史,太田 弘道,池田 輝之,羽鳥 仁人
熱物性, 2021年02月, ［査読有り］

Earth-Abundant Fe–Al–Si Thermoelectric (FAST) Materials: From Fundamental Materials Research to Module Development
Yoshiki Takagiwa; Teruyuki Ikeda; Hiroyasu Kojima
ACS Applied Materials & Interfaces, 2020年10月, ［査読有り］

Effective pore size control method for lotus aluminum by phase field method
K. Iitsuka; Y. Sasajima; T. Ikeda, ラスト(シニア)オーサー
Materials Science & Engineering B, 2020年08月, ［査読有り］

Activated reactive consolidation method as a new approach to enhanced thermoelectric properties of n-type nanostructured Mg2Si
Babak Alinejad; Yoshiki Takagiwa; Teruyuki Ikeda, ラスト(シニア)オーサー
ACS Applied Energy Materials, 2020年04月09日, ［査読有り］

Thermal microscope measurement of thermal effusivity distribution in compositionally graded PbTe–Sb2Te3–Ag2Te alloy system
Tsuyoshi Nishi; Suguru Yamamoto; Mori Okawa; Kimihito Hatori; Teruyuki Ikeda; Hiromichi Ohta
Thermochimica Acta, 2018年, ［査読有り］

Phase-field simulation of the Si precipitation process in Mg2Si under an applied stress
Bin Liu; Teruyuki Ikeda; Yasushi Sasajima
Mater. Sci. Eng. B, 2018年, ［査読有り］

ロータスアルミニウムにおけるポア成長のフェーズフィールドシミュレーション　　　　　　　　　　　　　　　
劉濱,池田輝之,篠嶋妥
軽金属, 2018年, ［査読有り］

Low temperature rapid fabrication of magnesium silicide for thermoelectric application　　　　　　　　　　　　　　　
Babak Alinejad; Teruyuki Ikeda, 責任著者
Funct. Mater. Lett., 2018年, ［査読有り］

Simulation of the Si Precipitation Process in Mg2Si Using a Phase-Field Kinetic Model
Bin Liu; Teruyuki Ikeda; Yasushi Sasajima, The Si precipitation process in an Mg2Si matrix has been simulated by the phase-field kinetic model, considering the eigen strain at the interface between precipitates and the matrix. We observed that the shape of the precipitate changed during the course of heat treatment from circular to lenticular. As the Si precipitate grew larger, the adjacent precipitate aggregated to form a lamellar microstructure. This microstructure is suitable for thermo-electric materials because the scattering of phonons will frequently occur at the interface between the Si precipitates and the Mg2Si matrix. Our present simulation suggests drastic improvements of thermo-electric properties of this type of material are possible due to the eigen strain., JAPAN INST METALS
MATERIALS TRANSACTIONS, 2016年, ［査読有り］

Applying Quantitative Microstructure Control in Advanced Functional Composites
Nicholas A. Heinz; Teruyuki Ikeda; Yanzhong Pei; G. Jeffrey Snyder, Microstructure control in functional materials draws from a historical reserve rich in established theory and experimental observation of metallurgy. Methods such as rapid solidification, eutectoid reaction, and nucleation and growth precipitation have all proven to be effective means to produce microstructure relevant for a wide array of applications. Here, the available parameters to control structure morphology, size, and spacing are discussed using thermoelectric composites as an example. Moreover, exploiting different aspects of a material system's phase diagram enables a controlled introduction of nanostructures. While much of this discussion is pertinent to the rapidly developing field of thermal conductivity control in thermoelectric composites, these techniques can be applied to a variety of other material systems where their use may lead to novel electrical, optical, as well as thermal properties of semiconductors and insulators as it has in the past for the mechanical properties of metals., WILEY-V C H VERLAG GMBH
ADVANCED FUNCTIONAL MATERIALS, 2014年04月, ［査読有り］

Rational design of p-type thermoelectric PbTe: temperature dependent sodium solubility
Sima Aminorroaya Yamini; Teruyuki Ikeda; Aaron Lalonde; Yanzhong Pei; Shi Xue Dou; G. Jeffrey Snyder, We develop a solid understanding of the temperature-dependent solubility of sodium in p-type PbTe, the most efficient thermoelectric material. The maximum solubility of sodium telluride (NaTe) in PbTe is measured to be 1.4 +/- 0.3 at% and the heat of solution is evaluated as 26(-11)(+19) kJ mol(-1) that addresses fundamental issues regarding the formation of nano-precipitates., ROYAL SOC CHEMISTRY
JOURNAL OF MATERIALS CHEMISTRY A, 2013年, ［査読有り］

Hot pressing and nanostructuring of Bi90Sb10 alloys to concurrently improve mechanical and thermoelectric properties
Nicholas A. Heinz; Sarah Howell; Heng Wang; Teruyuki Ikeda; G. Jeffrey Snyder, The microstructure of Bi90Sb10 composites with separate additions of Ag and As was studied, and measurements of the room temperature transport properties were made to see the effects of hot pressing with and without precipitates. The most successful nanostructured Bi90Sb10 samples were those containing As when annealed for durations of 3 days or less near the solidus temperature. The transport measurements showing similar electrical resistivity and decreased thermal conductivity with the addition of precipitates at room temperature demonstrates the potential of this bulk nanostructuring and synthesis approach in this material system. With further study, this work could be helpful in creating similar complex nanostructured systems which have the potential to yield high-efficiency thermoelectric materials for low temperature applications. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, WILEY-V C H VERLAG GMBH
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 2012年12月, ［査読有り］

A combinatorial approach to microstructure and thermopower of bulk thermoelectric materials: the pseudo-ternary PbTe–Ag2Te–Sb2Te3 system
Teruyuki Ikeda; Shiho Iwanaga; Hsin-jay Wu; Nathan J. Marolf; Sinn-wen Chen; G. Jeffrey Snyder, The microstructures and Seebeck coefficients of thermoelectric alloys in the pseudo-ternary PbTe-Ag2Te-Sb2Te3 system were examined using samples that were compositionally graded by unidirectional solidification by the Bridgman method and diffusion couples. At compositions near the middle of the pseudo-binary PbTe-AgSbTe2 line, a compositionally modulated microstructure has been found. From diffusion couple experiments, it is found that the PbTe-AgSbTe2 system exhibits a miscibility gap at low temperatures while it forms a complete solid solution at high temperatures; the critical temperature is between 400 degrees C and 450 degrees C. The modulated microstructure originates from the decomposition of the high-temperature solid solution during cooling. Scanning Seebeck coefficient measurement on these samples covers a wide compositional space of the pseudo-ternary system. The Seebeck coefficient transitions from positive values at AgSbTe2-rich compositions to negative values at PbTe-rich compositions on the pseudo-binary PbTe-AgSbTe2 line. Composition-graded samples prepared by the Bridgman method are thus useful to investigate thermoelectric materials in multi-component systems., ROYAL SOC CHEMISTRY
Journal of Materials Chemistry, 2012年12月, ［査読有り］

Reduced thermal conductivity in Pb-alloyed AgSbTe2 thermoelectric materials
Hsin-jay Wu; Sinn-wen Chen; Teruyuki Ikeda; G. Jeffrey Snyder, Pb-alloyed AgSbTe2 (PbxAg20Sb30-x Te-50 (x = 3, 4, 5 and 6)) composites were synthesized using a modified Bridgman method with a graphite mold to form plate-like samples. The Bridgman-grown specimens were dense, with few solidification cavities, and were sufficiently mechanically robust for a variety of electronic/thermal transport measurements. Inhomogeneity was found on the grain boundary, and was embedded with the nanoprecipitates of delta-Sb2Te with a feature size of 100 nm of the 5 at.% Pb and 6 at.% Pb specimens. A combined effect of alloying, inhomogeneity and nanoprecipitates leads to a low thermal conductivity of 0.3-0.4W m(-1) K-1, which approaches the theoretical minimum thermal conductivity of the amorphous material ((K)min similar to 0.36W m-1 K-1). A peak of the zT value, ranging from 0.7 to 0.8, is achieved at 425 K. Further annealing at 673 K increases the grain size and causes a reduction in the value of the zT peak to 0.4. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 2012年10月, ［査読有り］

Nanostructuring of Thermoelectric Mg2Si via a Nonequilibrium Intermediate State
Teruyuki Ikeda; Laura Haviez; Youli Li; G. Jeffrey Snyder, WILEY-V C H VERLAG GMBH
SMALL, 2012年08月, ［査読有り］

Formation of highly oriented large nanoscale In2Te3 precipitates in bulk Bi2Te3
Nicholas A. Heinz; Teruyuki Ikeda; G. Jeffrey Snyder, Nucleation and growth precipitation experiments were conducted on samples of In-alloyed Bi2Te3 with a starting composition of Bi1.65In0.35Te3 (7 at.% In) to investigate the phase diagram of the Bi2Te3-In2Te3 system. Temperature-dependent equilibrium solubilities were determined at 500 and 450 degrees C and also the maximum solubility of In in Bi2Te3 was verified by unidirectional solidification using the Bridgman method. The In2Te3 structures formed during precipitation are either plates or elongated ribbons with thicknesses of the order of hundreds of nanometers with a heavily temperature-dependent spacing distribution. All in-grain precipitation occurs along the {0 0 0 1} family of planes in Bi2Te3. The orientation relationship between Bi2Te3-In2Te3 was found to be {0001}Bi2Te3 parallel to {111}In2Te3 and consequently < 11 (2) over bar0 > Bi2Te3 parallel to < 1 1 0 > In2Te3, which aligns the close-packed planes and directions. The resulting matrix is expected to be lightly doped and may be suitable for microstructure engineering for near room temperature thermoelectric applications. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 2012年06月, ［査読有り］

Formation of ordered nano-wire microstructures in thermoelectric Pb–Ag–Sb–Te
H.-J. Wu; S.-W. Chen; T. Ikeda; G.J. Snyder, Regular arrays of nano-wire microstructures containing Ag2Te rods with diameter <400 nm and inter-rod distance <1 mu m are formed in a matrix of AgSbTe2 + delta-Sb2Te, which makes an ordered nano-wire composite thermoelectric material. This microstructure is formed during eutectic solidification processing. To understand and guide production of uniform bulk samples of this composite, the liquidus projection of quaternary Pb-Ag-Sb-Te system at 36.0 at.% Te isoplethal section is constructed experimentally, using quenched samples. A three-phase univariant reaction of the quaternary Pb-Ag-Sb-Te system, L --> AgSbTe2 + Ag2Te + delta-Sb2Te, is investigated, between a ternary-eutectic melt (Ag-40.0 at.% Sb-36.0 at.% Te) and a quaternary melt (Pb-22.0 at.% Ag-40.0 at.% Sb-36.0 at.% Te), at 496.1 degrees C and 503.9 degrees C, respectively. High-resolution transmission electron microscopy confirms that these three phases are simultaneously present at the nanometer scale. Furthermore, unidirectional solidification experiments of the ternary eutectic alloy using the Bridgman method are carried out to examine the alloy's solidification behavior. (C) 2011 Acta Materialia inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
Acta Materialia, 2012年02月, ［査読有り］

3D MICROSTRUCTURES OF Sb2Te3 PRECIPITATES IN PbTe MATRIX WITH PREDICTION BY A WEAK COMPATIBILITY CONDITION
Xian Chen; Shanshan Cao; Teruyuki Ikeda; Vijay Srivastava; G. Jeffrey Snyder; Dominique Schryvers; Richard D. James, We propose that a weak compatibility condition predicts the elongated directions for Widmanstatten type precipitates. The distribution of the elongated directions of precipitates lies on a family of crystallographically equivalent cones in 3D determined by a certain transformation stretch matrix obtained independently. A 3D visualization and digitization method is developed to show how the cone variants control the preferred growth directions during precipitation of Sb2Te3 in a (5 mu m)(3) PbTe matrix. A series of two-dimensional secondary electron images are acquired along the direction perpendicular to the imaging plane. By pixelating all the images and calculating the position vectors on the surface of each precipitate, the elongation directions are calculated using a 3-dimensional ellipsoidal fitting for 182 precipitates. The 3D plot of the elongation directions shows that their spacial orientations are close to four predicted cones with a standard deviation of 5.6 degrees. The length along the elongation directions reveals an asymmetric distribution with a mean value of about 240 nm. The total volume fraction of the precipitates is 8.3 %. The average area of the precipitates per volume is 0.68 mu m(-1) by one point statistical calculation. These results build on our study presented in [1] by analyzing a significantly bigger data set and by including the length distribution and 1-point statistics., JOHN WILEY & SONS
PROCEEDINGS OF THE 1ST INTERNATIONAL CONFERENCE ON 3D MATERIALS SCIENCE, 2012年, ［査読有り］

Solubility and microstructure in the pseudo-binary PbTe-Ag2Te system
Kristin Bergum; Teruyuki Ikeda; G. Jeffrey Snyder, The solvus lines of the PbTe and Ag2Te phases in the pseudo-binary PbTe-Ag2Te system have been determined using diffusion couples and unidirectional solidification by the Bridgman method. The solubilities of both Ag2Te in PbTe and PbTe in Ag2Te decrease with decrease in temperature. For the former, this change is from 14.9 at% Ag (694 degrees C) to 0.5 at% Ag (375 degrees C), while for the latter it is from 12.4 at% Pb (650 degrees C) to 3.1 at% Pb (375 degrees C). The decrease in solubilities leads to the formation of precipitates of Ag2Te in PbTe and PbTe in AB(2)Te. In particular, fast atomic diffusion in Ag2Te results in the precipitation of PbTe even in quenched samples. From the temperature dependence of these solubilities, heats of solution have been determined. In the diffusion couple, the phase boundary moves toward PbTe. In the region between the phase boundary and the initial interface, PbTe transforms to beta-Ag2Te (cubic) retaining the cube-on-cube orientation relationship. (C) 2011 Elsevier Inc. All rights reserved., ACADEMIC PRESS INC ELSEVIER SCIENCE
JOURNAL OF SOLID STATE CHEMISTRY, 2011年09月

A weak compatibility condition for precipitation with application to the microstructure of PbTe-Sb2Te3 thermoelectrics
Xian Chen; Shanshan Cao; Teruyuki Ikeda; Vijay Srivastava; G. Jeffrey Snyder; Dominique Schryvers; Richard D. James, We propose a weak condition of compatibility between phases applicable to cases exhibiting full or partial coherence and Widmanstatten microstructure. The condition is applied to the study of Sb2Te3 precipitates in a PbTe matrix in a thermoelectric alloy. The weak condition of compatibility predicts elongated precipitates lying on a cone determined by a transformation stretch tensor. Comparison of this cone with the long directions of precipitates determined by a slice-and-view method of scanning electron microscopy combined with focused ion beam sectioning shows good agreement between theory and experiment. A further study of the morphology of precipitates by the Eshelby method suggests that interfacial energy also plays a role and gives an approximate value of interfacial energy per unit area of 250 dyn cm(-1). (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 2011年09月

Zone Leveling Crystal Growth of Thermoelectric PbTe Alloys with Sb2Te3 Widmanstatten Precipitates
Teruyuki Ikeda; Nathan J. Marolf; G. Jeffrey Snyder, Unidirectional solidification of PbTe-rich alloys in the pseudobinary PbTe-Sb2Te3 system using the zone leveling technique enables the production of large regions of homogeneous solid solutions for the formation of precipitate nanocomposites as compared with Bridgman solidification. (PbTe)(0.940)(Sb2Te3)(0.060) and (PbTe)(0.952)(Sb2Te3)(0.048) alloys were successfully grown using (PbTe)(0.4)(Sb2Te3)(0.6) and (PbTe)(0.461)(Sb2Te3)(0.539) as seed alloys, respectively, with 1 mm h(-1) withdrawal velocity. In the unidirectionally solidified regions of both alloys, Widmanstatten precipitates are formed due to the decrease in solubility of Sb2Te3 in PbTe. To determine the compositions of the seed alloys for the zone leveling experiments, the solute distribution in solidification in the PbTe-richer part of the pseudobinary PbTe-Sb2Te3 system has been examined from the concentration profiles in the samples unidirectionally solidified by the Bridgman method., AMER CHEMICAL SOC
CRYSTAL GROWTH & DESIGN, 2011年09月

Solubility and formation of ternary Widmanstatten precipitates in PbTe in the pseudo-binary PbTe-Bi2Te3 system
Teruyuki Ikeda; Marcus B. Toussaint; Kristin Bergum; Shiho Iwanaga; G. Jeffrey Snyder, A unidirectional solidification experiment by Bridgman method has been performed for the Pb14Bi28.8Te57.2 composition, which lies on the pseudo-binary PbTe-Bi2Te3 system, resulting in the formation of Widmanstatten precipitates of a ternary compound, most likely with the structure of PbBi2Te4 in the PbTe matrix. The formation of the precipitates is caused by the decrease of bismuth solubility in the PbTe phase with decreasing temperature. The PbTe-rich part of the PbTe-Bi2Te3 phase diagram was investigated from the compositional variations in the unidirectionally solidified sample and the diffusion couples. This proved that the solubility decreases with decreasing temperature: 15.6 +/- A 0.9 (583 A degrees C) to (450 A degrees C) at.% Bi. The orientation relationship between the matrix and precipitates has been examined by electron backscatter diffraction technique; precipitation occurs on {111} habit planes in PbTe with orientation relationship (0001)(precipitate)//{111}(PbTe) and The thermoelectric properties in PbTe with Widmanstatten precipitates as examined by the scanning Seebeck probe method is -46 +/- A 2 mu VK-1., SPRINGER
JOURNAL OF MATERIALS SCIENCE, 2011年06月

Size control of Sb2Te3 Widmanstatten precipitates in thermoelectric PbTe
Teruyuki Ikeda; Nathan J. Marolf; Kristin Bergum; Marcus B. Toussaint; Nicholas A. Heinz; Vilupanur A. Ravi; G. Jeffrey Snyder, The number density and area per unit volume of Sb2Te3 Widmanstatten plates in thermoelectric PbTe were controlled through two types of heat treatments of (PbTe)(1-x)-(Sb2Te3)(x), where x = 0.04 and 0.06: isothermal annealing at various temperatures and cooling from a solid-solution regime to a two-phase region with various rates. The microstructure was quantified by image analysis of scanning electron micrographs and Rietveld refinements of X-ray diffraction profiles. Isothermal annealing of (PbTe)(0.94)-(Sb2Te3)(0.06), results in increasing number density and area per volume of precipitates with decreasing temperature. In controlled cooling rate experiments, faster cooling rates or smaller x result in higher number density and area per volume. These trends are discussed using phase transformation theories. Overall the number density and area per volume of precipitates were controlled in the ranges from 0.4 to 44 mu m(-3) and from 0.5 to 1.8 mu m(-1) respectively. Isothermal annealing was performed for time periods from 10 to 166 h at 723 K to check the stability of the microstructure at the (PbTe)(0.94)-(Sb2Te3)(0.06) composition. While the Boyd and Nicholson model of the Greenwood-Lifshitz-Slyozov Wagner theory for the average diameter of plates gives a reasonable value for peripheral interfacial energy, the time dependence was found to decelerate more than the t(1/3) rule. It has also been found that the coarsening mechanism involves the elongation of plates. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 2011年04月

Rapid consolidation of powdered materials by induction hot pressing
Aaron D. LaLonde; Teruyuki Ikeda; G. Jeffrey Snyder, A rapid hot press system in which the heat is supplied by RF induction to rapidly consolidate thermoelectric materials is described. Use of RF induction heating enables rapid heating and consolidation of powdered materials over a wide temperature range. Such rapid consolidation in nanomaterials is typically performed by spark plasma sintering (SPS) which can be much more expensive. Details of the system design, instrumentation, and performance using a thermoelectric material as an example are reported. The Seebeck coefficient, electrical resistivity, and thermal diffusivity of thermoelectric PbTe material pressed at an optimized temperature and time in this system are shown to agree with material consolidated under typical consolidation parameters. (C) 2011 American Institute of Physics. [doi:10.1063/1.3534080], AMER INST PHYSICS
REVIEW OF SCIENTIFIC INSTRUMENTS, 2011年02月, ［査読有り］

Interfacial disconnections at Sb2Te3 precipitates in PbTe: Mechanisms oFstrain accommodation and phase transformation at a tetradymite/rocksalt telluride interface　　　　　　　　　　　　　　　
N. Heinz; T. Ikeda; G.J. Snyder; D.L. Medlin
Acta Mater., 2011年, ［査読有り］

Effective thermal conductivity of polycrystalline materials with randomly oriented superlattice grains
Fan Yang; Teruyuki Ikeda; G. Jeffrey Snyder; Chris Dames, A model has been established for the effective thermal conductivity of a bulk polycrystal made of randomly oriented superlattice grains with anisotropic thermal conductivity. The in-plane and cross-plane thermal conductivities of each superlattice grain are combined using an analytical averaging rule that is verified using finite element methods. The superlattice conductivities are calculated using frequency dependent solutions of the Boltzmann transport equation, which capture greater thermal conductivity reductions as compared to the simpler gray medium approximation. The model is applied to a PbTe/Sb2Te3 nanobulk material to investigate the effects of period, specularity, and temperature. The calculations show that the effective thermal conductivity of the polycrystal is most sensitive to the in-plane conductivity of each superlattice grain, which is generally four to five times larger than the cross-plane conductivity of a grain. The model is compared to experimental measurements of the same system for periods ranging from 287 to 1590 nm and temperatures from 300 to 500 K. The comparison suggests that the effective specularity increases with increasing annealing temperature and shows that these samples are in a mixed regime where both Umklapp and boundary scattering are important. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3457334], AMER INST PHYSICS
JOURNAL OF APPLIED PHYSICS, 2010年08月

Microstructure Size Control through Cooling Rate in Thermoelectric PbTe-Sb2Te3 Composites
Teruyuki Ikeda; Vilupanur A. Ravi; G. Jeffrey Snyder, Microstructures of alloys with three compositions in the pseudobinary PbTe-Sb2Te3 system cast in copper molds using the injection molding technique were examined by scanning electron microscopy (SEM), energy-dispersive spectrometry, and X-ray diffraction (XRD). The microstructural length scales such as interlamellar spacing (ILS) and secondary dendrite arm spacing vary over two orders of magnitude, e.g., from 0.2 to 20 mu m for SDAS in the hypereutectic alloy, depending on injection pressure, distance from surface, or thickness. The decrease in the microstructural length scale with the decrease in distance from the surface, thickness, and increase in injection pressure is attributed to an increase in the cooling rates estimated using the heat-transfer theory in solids. The difference in the injection pressures is represented as the difference in the heat-transfer coefficients., SPRINGER
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2010年03月

Nanostructure formation in bulk thermoelectric compounds in the pseudo binary PbTe-Sb2Te3 system
Teruyuki Ikeda; G. Jeffrey Snyder, Studies on microstructures in thermoelectric compounds in the pseudobinary PbTe-Sb2Te3 system are overviewed and strategies to control the microstructure of thermoelectric compounds are discussed on the basis of the phase diagram and phase transformation theories. The morophology of solidification from the melt results in dendrite or lamellar structure depending on composition. The size-scales of the microstructures obtained by solidification can be controlled from the order of micrometers to tens of micrometers by controlling cooling rates (dendrites) or solidification velocity (lamellae). Lamellar and Widmanstatten structures are obtained by eutectoid (Pb2Sb6Te11 -> PbTe + Sb2Te3) and precipitation (PbTe (Sb2Te3). PbTe + Sb2Te3) reactions, respectively. These solid-state transformations show features with nanometer size-scales. For the eutectoid reaction the size-scale depends on annealing temperature and time. For precipitation, the size-scale depends on composition as well as cooling rate or annealing temperature. Such behavior can be understood in terms of phase transformation theories., MATERIALS RESEARCH SOC
THERMOELECTRIC MATERIALS 2010 - GROWTH, PROPERTIES, NOVEL CHARACTERIZATION METHODS AND APPLICATIONS, 2010年

Nanostructure formation in bulk thermoelectric compounds in the pseudo binary PbTe-Sb₂Te₃ system　　　　　　　　　　　　　　　
Teruyuki Ikeda; G. Jeffrey Snyder
Mater. Res. Soc. Symp. Proc., 2010年

In situ observation of eutectoid reaction forming a PbTe-Sb2Te3 thermoelectric nanocomposite by synchrotron X-ray diffraction
Teruyuki Ikeda; Eric S. Toberer; Vilupanur A. Ravi; G. Jeffrey Snyder; Shinobu Aoyagi; Eiji Nishibori; Makoto Sakata, In situ high-temperature powder X-ray diffraction experiments have been performed on Pb10.5Sb31.6Te57.9 using a synchrotron X-ray source to observe the eutectoid reaction from Pb2Sb6Te11 to PbTe and Sb2Te3. Molar fractions of the constituent phases and fraction transformed were obtained as functions of time. The experimental fraction transformed vs. time curve were well fitted by the Kolmogorov-Johnson-Mehl-Avrami equation with an Avrami index n = 1.4. The small n value suggests that the growth of the new (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
SCRIPTA MATERIALIA, 2009年03月

Formation of Sb2Te3 Widmanstatten precipitates in thermoelectric PbTe
Teruyuki Ikeda; Vilupanur A. Ravi; G. Jeffrey Snyder, Unidirectional solidification experiments have been performed with a thermoelectric alloy with a starting composition of Pb10.5Sb31.6Te57.9 in the pseudobinary PbTe-Sb2Te3 system. The bottom of the resulting rod consists of PbTe phase with Widmanstatten precipitates of Sb2Te3. The precipitation is due to a decrease in the solubility of Sb2Te3 with temperature: the solubility at 450 degrees C was determined to be 2.1 +/- 0.2 at.% Sb. The average thickness of plates was estimated to be similar to 100 nm. The spacings between neighboring plates has a distribution in the 200-3000 nm range, peaking around 900 nm. The habit planes of precipitation are of the {1 1 1}PbTe family. An orientation relationship of (0001)Sb2Te3//{1 1 1}PbTe and < 1 1 (2) over bar0 > Sb2Te3//< 110 > PbTe was found with a maximum misorientation of 15 degrees. The Seebeck coefficient after annealing at 450 degrees C was -50 +/- 10 mu V degrees C-1 at room temperature. To improve the thermoelectric properties, tuning of the carrier concentration would be necessary. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 2009年02月

Structure and high-temperature thermoelectric properties of SrAl2Si2
Susan M. Kauzlarich; Cathie L. Condron; Jonathan K. Wassei; Teruyuki Ikeda; G. Jeffrey Snyder, Single crystals of SrAl2Si2 were synthesized by reaction of the elements in an aluminum flux at 1000 degrees C. SrAl2Si2 is isostructural to CaAl2Si2 and crystallizes in the hexagonal space group P-3m1 (90K, a = 4.1834 (2), c = 7.4104 (2) angstrom, Z = 1, R1 = 0.0156, wR2 = 0.0308). Thermal analysis shows that the compound melts at similar to 1020 degrees C. Low-temperature resistivity on single crystals along the c-axis shows metallic behavior with room temperature resistivity value of similar to 7.5 m Omega cm. High-temperature Seebeck, resistivity, and thermal conductivity measurements were made on hot-pressed pellets. The Seebeck coefficient shows negative values in entire temperature range decreasing from similar to-78 mu V K-1 at room temperature to -34 mu V K-1 at 1173K. Seebeck coefficients are negative indicating n-type behavior; however, the temperature dependence is consistent with contribution from minority p-type carriers as well. The lattice contribution to the thermal conductivity is higher than for clathrate structures containing Al and Si, approximately 50 mW cm(-1) K, and contributes to the overall low zT for this compound. (C) 2008 Elsevier Inc. All rights reserved., ACADEMIC PRESS INC ELSEVIER SCIENCE
JOURNAL OF SOLID STATE CHEMISTRY, 2009年02月, ［査読有り］

Traversing the Metal-Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb14Mn1-xAlxSb11
Eric S. Toberer; Catherine A. Cox; Shawna R. Brown; Teruyuki Ikeda; Andrew F. May; Susan M. Kauzlarich; G. Jeffrey Snyder, For high temperature thermoelectric applications, Yb14MnSb11 has a maximum thermoelectric figure of merit (zT) of similar to 1.0 at a high zT is found despite a carrier concentration that is higher than typical thermoelectric materials. Here, we reduce the carrier concentration with the discovery of a continuous transition between metallic Yb14MnSb11 and semiconducting Yb(1)4AlSb(11). Yb14Mn1-xAlxSb11 forms a solid solution where the free carrier concentration gradually changes as expected from the Zintl valence formalism. Throughout this transition the electronic properties are found to obey a rigid band model with a band gap of 0.5 eV and an effective mass of 3 m(c). As the carrier concentration decreases, an increase in the Seebeck coefficient is observed at the expense of an increased electrical resistivity. At the optimum carrier concentration. a maximum zT of 1.3 at 1223 K is obtained, which is more than twice that of the state-of-the-art Si0.8Ge0.2 flown by NASA., WILEY-V C H VERLAG GMBH
ADVANCED FUNCTIONAL MATERIALS, 2008年09月, ［査読有り］

Evaluation of true interlamellar spacing from microstructural observations
Teruyuki Ikeda; Vilupanur A. Ravi; G. Jeffrey Snyder, A method for evaluating true interlamellar spacing from micrographs is proposed for a multidomained lamellar structure. The microstructure of these materials is assumed to be composed of many domains with the lamellae aligned roughly parallel to each other within each domain and with the domains themselves randomly oriented relative to one another. An explicit expression for the distribution of apparent interlamellar spacing is derived assuming that the distribution of the true interlamellar spacing is Gaussian. The average interlamellar spacing is close to the peak interlamellar spacing observed in the distribution. The theoretical distributions are compared with experimental ones obtained by analyzing micrographs of PbTe-Sb2Te3 lamellar composites., MATERIALS RESEARCH SOC
JOURNAL OF MATERIALS RESEARCH, 2008年09月, ［査読有り］

Synthesis, structure, and high-temperature thermoelectric properties of boron-doped Ba(8)Al(14)Si(31) clathrate I phases
Cathie L. Condron; Susan M. Kauzlarich; Teruyuki Ikeda; G. Jeffrey Snyder; Frank Haarmann; Peter Jeglic, Single crystals of boron-doped Ba(8)Al(14)Si(31) clathrate I phase were prepared using Al flux growth. The structure and elemental composition of the samples were characterized by single-crystal and powder X-ray diffraction; elemental analysis; and multinuclear (21)Al, (11)B, and (29)Si solid-state NMR. The samples' compositions of Ba(8)B(0.17)Al(14)Si(31), Ba(8)B(0.19)Al(15)Si(31), and Ba(8)B(0.32)Al(14)Si(31) were consistent with the framework-deficient clathrate I structure Ba8Al(x)Si(42-3/4x)square(4-1/4x) (X = 14, square = lattice defect). Solid-state NMR provides further evidence for boron doped into the framework structure. Temperature-dependent resistivity indicates metallic behavior, and the negative Seebeck coefficient indicates that transport processes are dominated by electrons. Thermal conductivity is low, but not significantly lower than that observed in the undoped Ba(8)Al(14)Si(31) prepared in the same manner., AMER CHEMICAL SOC
INORGANIC CHEMISTRY, 2008年09月, ［査読有り］

High thermoelectric efficiency in lanthanum doped Yb(14)MnSb(11)
Eric S. Toberer; Shawna R. Brown; Teruyuki Ikeda; Susan M. Kauzlarich; G. Jeffrey Snyder, Lanthanum doping of the high-temperature p-type thermoelectric material Yb(14)MnSb(11) enhances the figure of merit (zT) through carrier concentration tuning. This is achieved by substituting La(3+) on the Yb(2+) site to reduce the free hole concentration as expected from the change in valence. The high-temperature transport properties (Seebeck coefficient, electrical resistivity, Hall mobility, and thermal conductivity) of Yb(13.6)La(0.4)MnSb(11) are explained by the change in carrier concentration using a simple rigid parabolic band model, similar to that found in Yb(14)Mn(1-x)Al(x)Sb(11). Together, use of these two dopant sites enables the partial decoupling of electronic and structural properties in Yb(14)MnSb(11)-based materials. (C) 2008 American Institute of Physics., AMER INST PHYSICS
APPLIED PHYSICS LETTERS, 2008年08月, ［査読有り］

Improved thermoelectric performance in Yb14Mn1-xZnxSb11 by the reduction of spin-disorder scattering
Shawna R. Brown; Eric S. Toberer; Teruyuki Ikeda; Catherine A. Cox; Franck Gascoin; Susan M. Kauzlarich; G. Jeffrey Snyder, Rare-earth transition metal compounds Yb14Mn1-xZnxSb11, isostructural with Ca14AlSb11, have been prepared using a metal flux growth technique for thermoelectric property measurements (with x = 0.0, 0.2, 0.3, 0.4, 0.7, 0.9, and 1.0). Single-crystal X-ray diffraction and electron microprobe analysis data indicate the successful synthesis of a solid-solution for the Yb14Mn1-xZnxSb11 structure type for 0 < x < 0.4. Hot-pressed polycrystalline samples showed that the product from the flux reaction was a pure phase from x = 0 through x = 0.4 with the presence of a minor secondary phase for compositions x > 0.4. High-temperature (298 K-1275 K) measurements of the Seebeck coefficient, resistivity, and thermal conductivity were performed on hot-pressed, polycrystalline samples. As the concentration of Zn increases in Yb14Mn1-xZnxSb11, the Seebeck coefficient remains unchanged for 0 <= x <= 0.7 indicating that the free carrier concentration has remained unchanged. However, as the nonmagnetic Zn2+ ions replace the magnetic Mn2+ ions, the spin disorder scattering is reduced, lowering the resistivity. Replacing the magnetic Mn2+ with non magnetic Zn2+ provides an independent means to lower resistivity without deleterious effects to the Seebeck values or thermal conduction. Alloying the Mn site with Zn reduces the lattice thermal conductivity at low temperatures but has negligible impact at high temperatures. The reduction of spin disorder scattering leads to an similar to 10% improvement over Yb14MnSb11, revealing a maximum thermoelectric figure of merit (zT) of similar to 1.1 at 1275 K for Yb14Mn0.6Zn0.4Sb11., AMER CHEMICAL SOC
CHEMISTRY OF MATERIALS, 2008年05月, ［査読有り］

Lattice thermal conductivity of self-assembled PbTe-Sb2Te3 composites with nanometer lamellae
Teruyuki Ikeda; Eric S. Toberer; Vilupanur A. Ravi; Sossina M. Haile; G. Jeffrey Snyder, In the system of PbTe and Sb2Te3, a metastable compound Pb2Sb6Te11 appears by solidification processing. It has been reported that heat treatments decomposes this compound into two immiscible thermoelectric materials forming nanosized lamellar structure. The fraction transformed and the interlamellar spacing was systematically investigated. In this work, the thermal conductivities and the electrical resistivities have been measured as functions of annealing time through the transformation and the coarsening processes to clarify the effect of the fraction transformed and the inter-lamellar spacing. The thermal conductivity of Pb2Sb6Te11 is lower than that after the decomposition. The lattice part of the thermal conductivity of PbTe/Sb2Te3 lamellar samples decreases with deccreasing inter-lamellar spacing. This is considered to be due to the coarsening of the microstructure., IEEE
PROCEEDINGS ICT 07: TWENTY-SIXTH INTERNATIONAL CONFERENCE ON THERMOELECTRICS, 2008年, ［査読有り］

TiAl金属間化合物単結晶における拡散
野瀬嘉太郎; 寺下直宏; 池田輝之; 中嶋英雄, The Japan Institute of Metals and Materials
まてりあ, 2007年09月01日

TiAl金属間化合物単結晶における拡散
野瀬 嘉太郎; 寺下 直宏; 池田 輝之; 中嶋 英雄, 日本金属学会
まてりあ : 日本金属学会会報, 2007年09月01日

Development and evolution of nanostructure in bulk thermoelectric Pb-Te-Sb alloys
Teruyuki Ikeda; Vilupanur A. Ravi; Lauren A. Collins; Sossina M. Haile; G. Jeffrey Snyder, Motivated by reports of exceptionally high zT > 2 in thin film superlattices or "quantum well" materials with nanometer sized features, we have undertaken a study of composite materials with nanoscale features that promise to provide similar structures in bulk material. Nanometer scale layers of PbTe and Sb2Te3 with periodicities of 180 nm to 950 nm form when quenched eutectic PbTe-Sb2Te3 melt, crystallizing as Pb2Sb6Te11, subsequently annealed. The lamellar spacing depends on the temperature and time of the anneal. The mechanism for the development of the nanostructures is probed by examining the fraction of material transformed as a function of anneal time. Preliminary analysis of the shape factor exponent reveals that the transformation to the nanostructured lamellae bears similarities to the thickening of very large plates. The coarsening of the lamellar spacing is also examined as a function of time and temperature., MINERALS METALS MATERIALS SOC
JOURNAL OF ELECTRONIC MATERIALS, 2007年07月, ［査読有り］

** Anisotropic fusion profile and joint strength of lotus-type porous magnesium by laser welding
Taichi Murakami; Takuya Tsumura; Teruyuki Ikeda; Hideo Nakajima; Kazuhiro Nakata, レーザ溶接実験とレーザ溶接数値解析によって、ロータス型ポーラスマグネシウム溶接継手の機械的特性と溶接ビードの溶融領域形状に及ぼす気孔方向の影響が調査された。溶融領域形状の気孔方向依存性がABAQUS有限要素コードとユーザサブルーチンにより計算された温度分布に基づいて評価された。計算された溶融領域形状は実験結果と良い一致を示した。このことにより、熱伝導率が溶融領域形状に著しい影響を与える事が示唆された。さらに、ポーラスマグネシウムの継手強度に及ぼす気孔方向の影響が検討された。気孔成長方向に関連したポーラスマグネシウムの引張強度の異方性が観察された。引張方向に対して気孔が平行な場合は溶融境界部で破断し、気孔が垂直な場合は母材部で破断した。
Materials Science and Engineering A, 2007年05月, ［査読有り］

Solidification processing of alloys in the pseudo-binary PbTe-Sb2Te3 system
Teruyuki Ikeda; Sossina M. Haile; Vilupanur A. Ravi; Hesham Azizgolshani; Franck Gascoin; G. Jeffrey Snyder, The effects of composition and cooling rate on the microstructures of alloys in the pseudo-binary PbTe-Sb2Te3 system were investigated as a first step towards the design of nanostructured materials with enhanced thermoelectric properties. Liquid alloys of three different compositions were cooled in three distinct ways: water quenching, air cooling and furnace cooling. The resultant structures and phases were examined by electron microscopy, electron microprobe chemical analysis and electron backscatter diffraction. The compound Pb2Sb6Te11 precipitated as a metastable phase (in conjunction with PbTe and/or Sb2Te3) under all conditions. Furthermore, whereas PbTe exhibited dendritic morphology, Sb2Te3 and Pb2Sb6Te11 I crystallized as lamellar platelets with preferred (00 1) orientation. The range of cooling rates was from similar to 1 to 26 K/s, while the characteristic microstructural feature size ranged from 10 to 35 pm for dendrites, and from 15 to 50 mu m for lamella. The prospects for achieving nanoscale structure are discussed. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 2007年02月

Self-assembled nanometer lamellae of thermoelectric PbTe and Sb2Te3 with epitaxy-like interfaces
Teruyuki Ikeda; Lauren A. Collins; Vilupanur A. Ravi; Franck S. Gascoin; Sossina M. Haile; G. Jeffrey Snyder, Utilizing the decomposition of metastable Pb2Sb6Te11 into PbTe and Sb2Te3, we produced a layered (lamellar) microstructure of PbTe and Sb2Te3 in which the interlamellar spacing can be controlled by the temperature and time of the decomposition process. Adjacent PbTe and Sb2Te3 lamellae are crystallographically oriented, indicating high-quality epitaxy-like interfaces. Average lamellar spacings as small as 180 nm are observed, corresponding to a PbTe layer thickness of 40 nm. These nanoscale multilayers, formed by bulk processing, resemble thin-film superlattice thermoelectric materials, which have shown exceptionally high thermoelectric efficiency., AMER CHEMICAL SOC
CHEMISTRY OF MATERIALS, 2007年02月

Fabrication of lotus-type porous magnesium and its alloys by unidirectional solidification under hydrogen atmosphere　　　　　　　　　　　　　　　
H. Hoshiyama; T. Ikeda; H. Nakajima
High Temp. Mater. Proc., 2007年, ［査読有り］

高分解能粉末回折によるPbTe‐Sb₂Te₃熱電変換材料の相分離過程のその場観察
青柳忍; 山田健一郎; 西堀英治; 坂田誠; 池田輝之; SUYDER G. Jeffrey
日本結晶学会年会講演要旨集, 2007年

ポーラス金属の作製と機能的特性 ロータス型ポーラス金属の物性および特性 3‐7 圧縮降伏応力(ロータス型ポーラスステンレス鋼)
井手拓哉; 多根正和; 池田輝之; 中嶋英雄
ポーラス金属の作製と機能的特性 平成15−18年度, 2007年

ポーラス金属の作製と機能的特性 ロータス型ポーラス金属の物性および特性 3‐11 熱伝導性(ロータス型ポーラス銅)
大串哲朗; 千葉博; 池田輝之; 中嶋英雄
ポーラス金属の作製と機能的特性 平成15−18年度, 2007年

ポーラス金属の作製と機能的特性 ロータス型ポーラス金属の作製 2‐2 連続帯溶融法 2‐2‐4 ロータス型ポーラスNi₃Al金属間化合物
玄丞均; 池田輝之; 中嶋英雄
ポーラス金属の作製と機能的特性 平成15−18年度, 2007年

ポーラス金属の作製と機能的特性 ロータス型ポーラス金属の作製 2‐2 連続帯溶融法 2‐2‐1 ロータス型ポーラスステンレス鋼
池田輝之; 青木健; 中嶋英雄
ポーラス金属の作製と機能的特性 平成15−18年度, 2007年

Synthesis, structure, and high temperature thermoelectric properties of Yb11Sb9.3Ge0.5
Japheth F. Rauscher; Susan M. Kauzlarich; Teruyuki Ikeda; G. Jeffrey Snyder, Zintl phase compounds with large unit cells and complex anionic structures such as Yb11Sb10 hold potential for being good thermoelectric materials. Single crystals of Ge-doped Yb11Sb10 were synthesized using a molten Sn-flux technique. Single crystal X-ray diffraction data were obtained and resulted in a composition of Yb11Sb9.3Ge0.5 which was verified by microprobe. Yb11Sb9.3Ge0.5 is isostructural to Ho11Ge10, crystallizing in a body-centered, tetragonal unit cell, space group I4/mmm, with Z = 4. The unit cell parameters of Yb11Sb9.3Ge0.5 are a = 11.8813(4), c = 17.1276(13) angstrom with a volume of 2417.8(2) angstrom(3). These parameters correlate well with the structural refinement of previously published Yb11Sb10. The structure consists of 16 isolated Sb3- anions, 8 Sb-2(4-) dumbbells, 2 Sb-4(4-) square planar rings and 44 Yb2+ cations. The Ge, doped in at 28% occupancy, was found to be site specific, residing on the 2 Sb-4(4-) square planar rings. Single crystal X-ray diffraction is most consistent with the site that makes up the square ring being less than fully occupied. The doped compound is additionally characterized by X-ray powder diffraction, differential scanning calorimetry and thermogravimetry. High temperature (300-1200 K) thermoelectric properties show that the doped compound has extremely low thermal conductivity (10-30 mW/cmK), lower than that of Yb11Sb10. Temperature dependent resistivity is consistent with a heavily doped semiconductor. Yb11Sb9.3Ge0.5 shows p-type behavior increasing from similar to 22 mu V/K at room temperature to similar to 31 mu V/K at 1140 K. The low value and the temperature dependence of the Seebeck coefficient suggest that bipolar conduction produces a compensated Seebeck coefficient and consequently a low zT., WILEY-V C H VERLAG GMBH
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 2007年, ［査読有り］

Fabrication of lotus-type porous Ni-(15, 28 and 31) at.% al alloys by unidirectional solidification in hydrogen atmosphere
Soong-Keun Hyun; Teruyuki Ikeda; Hideo Nakajima, Lotus-type porous Ni-(15, 28 and 3 1) at.% Al alloys whose long cylindrical pores are aligned in one direction were fabricated by continuous zone melting technique under high-pressure gas of hydrogen of 2.5 MPa. A part of 5-10 mm in length of the rod in the vicinity of the coil was melted by high frequency induction heating, and was moved downwards by electric motors at a constant velocity of 330 mu ms(-1) to 500 mu ms(-1) for unidirectional solidification. The pores are formed as a result of precipitation from the supersaturated hydrogen gas when the liquid metals dissolved with gas atoms is solidified. The porosity and the pore size decrease with increasing aluminum content. An increase of solidification velocity from 330 mu ms(-1) to 500 mu ms(-1) leads to a decrease of pore diameter and an increase of pore number in the porous Ni-28at%Al., TRANS TECH PUBLICATIONS LTD
ECO-MATERIALS PROCESSING AND DESIGN VIII, 2007年, ［査読有り］

Fabrication of lotus-type porous copper-aluminum alloy by unidirectional solidification in hydrogen atmosphere
Soong-Keun Hyun; Tsuyoshi Awadu; Teruyuki Ikeda; Hideo Nakajima, Lotus-type porous Cu-5at.%Al alloy whose elongated pores are aligned in one direction was fabricated by unidirectional solidification in pressurized hydrogen gas atmosphere. The porosity of the Cu-Al alloy was higher than that of pure copper under the same fabrication conditions because of difference in hydrogen solubility. The pore structure was not round shape because the directional pore growth was interrupted with dendrite arms formed during the solidification; the pores grew to detour the obstacle of the dendrite arms., TRANS TECH PUBLICATIONS LTD
THERMEC 2006, PTS 1-5, 2007年, ［査読有り］

ロータス型ポーラスアルミニウムとマグネシウムの製造
HYUN Soong‐Keun; PARK Jae‐Soung; 池田輝之; 鈴木進補; 中嶋英雄
軽金属学会シンポジウム, 2006年10月27日

Impurity diffusion in gamma-TiAl single crystals
Y Nose; N Terashita; T Ikeda; H Nakajima, The diffusion coefficient of In in gamma-TiAl single crystals has been measured using the ion implantation technique and secondary ion mass spectrometry in order to clarify the diffusion anisotropy: the diffusion perpendicular and parallel to the [001] axis. The diffusion of In perpendicular to the [001] axis is faster than that parallel to the [001] axis. Such diffusion anisotropy is similar to that of Ti previously investigated by our group. The diffusion coefficients of Fe and Ni have also been measured. The diffusion anisotropies of Fe and Ni show an opposite trend to those of In and Ti, namely the diffusion parallel to the [001] axis is faster than that perpendicular to this axis. The predominant process of diffusion perpendicular to the [001] axis is discussed from the viewpoint of activation energy using the expressions of the diffusion coefficients in Ll(0)-ordered alloys. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 2006年05月, ［査読有り］

Self- and impurity diffusion in gamma-TiAl single crystals
H. Nakajima; Y. Nose; T. Ikeda, The diffusion coefficients of Ti-14, Ni-63 and Fe-59 in gamma-TiAl single crystals have been measured by ion-beam sputter-sectioning technique, while those of In have been measured using ion implantation technique and secondary ion mass spectroscopy (SIMS) in order to clarify the diffusion anisotropy: the diffusion perpendicular and parallel to the [001] axis. The diffusion of Ti and In perpendicular to the [00 1] axis is faster than that parallel to the [001] axis. However, the diffusion anisotropies of Fe and Ni show opposite trend to those of Ti and In, namely the diffusion parallel to the [001] axis is faster than that perpendicular to the axis. The predominant process of diffusion perpendicular to the [001] axis has been discussed from a viewpoint of activation energy using the expression of the diffusion coefficients in L1(0)-ordered alloys., TRANS TECH PUBLICATIONS LTD
DIFFUSION IN SOLIDS AND LIQUIDS, 2006年, ［査読有り］

Compressive properties of lotus-type porous stainless steel
T. Ide; M. Tane; T. Ikeda; S.K. Hyun; H. Nakajima
Journal of Materials Research, 2006年01月, ［査読有り］

Fabrication and Tensile Properties of Lotus-Type Porous Iron and SUS304L Stainless Steel
S.K. Hyun; T. Ikeda; M. Tane; H. Nakajima
Materials Science Forum, 2005年11月, ［査読有り］

Fabrication of lotus-type porous stainless steel by Unidirectional Solidification under hydrogen aumosphere
T. Ikeda; T. Aoki; H. Nakajima
Metallugical and Materials Transactions, 2005年

Tracer diffusion of Fe and Pd in FePt and FePt(3)
Y Nose; T Ikeda; H Nakajima; H Numakura, The tracer diffusion coefficients of Fe and Pd have been measured in FePt and FePt(3) by standard radiotracer experiments. In FePt(3) the diffusion coefficients are lower than extrapolations of those in the high-temperature disordered state, exhibiting curved Arrhenius plots below the transformation temperature. The diffusion of Pd is faster than that of Fe, and noticeable dependence on composition is found for the latter. In the L1(0) ordered FePt, the diffusion of Fe has been verified to be slower in the direction of the tetragonal axis, but the case of Pd appears more complex. The diffusion coefficients of Fe and Pd are similar in magnitude in the L1(0) ordered state., TRANS TECH PUBLICATIONS LTD
DIFFUSION IN MATERIALS: DIMAT 2004, PTS 1 AND 2, 2005年, ［査読有り］

Fabrication of Lotus-type porous stainless steel by continuous zone melting technique and mechanical property
T Ikeda; T Aoki; H Nakajima, Lotus-type porous stainless steel (SUS304L) rods were fabricated by the continuous zone melting technique under a pressurized mixed gas of hydrogen and inert gas such as argon or helium. Pores with cylindrical shape, whose growth direction is parallel to the solidification direction are observed in the rods. The dependence of the porosity and averaged pore diameter on the partial pressure of hydrogen or the total pressure and on the transference velocity of rods was investigated. It was found that the porosity increases with increasing partial pressure of hydrogen under a constant total pressure and the pore diameter decreases with increasing transference velocity. The maximum porosity was about 60 pct under the experimental conditions in the present work. The observation of the microstructure and the. measurement of the tensile strength were also carried out., MINERALS METALS MATERIALS SOC
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2005年01月, ［査読有り］

Diffusion in L-1(0)-type single crystal TiAl and FePt intermetallic compounds
H Nakajima; Y Nose; N Terashita; T Ikeda; H Numakura, The diffusion coefficient of In in TiAl has been measured using ion implantation technique and secondary ion mass spectrometry. The diffusion coefficients of Fe and Pd in FePt have been measured at two compositions by radioactive tracer method. In order to clarify diffusion anisotropy, single crystal of each alloy was used. The In diffusion perpendicular to the [001] axis is faster than that parallel to the [001] axis. Such trend is similar to Ti diffusion previously measured in our group. The diffusion of Fe in FePt perpendicular to the [00 1] axis is faster than that parallel to the [001] axis at each composition, while the anisotropy of the Pd diffusion is different with composition. The predominant process of the diffusion in perpendicular to the [001] has been discussed on the basis of the expressions of the diffusion coefficients., TRANS TECH PUBLICATIONS LTD
DIFFUSION IN MATERIALS: DIMAT 2004, PTS 1 AND 2, 2005年, ［査読有り］

Fabrication of lotus-type porous stainless steel by Unidirectional Solidification under hydrogen aumosphere
T. Ikeda; T. Aoki; H. Nakajima
Metallurgical and Materials Transactions, 2005年

Titanium coating of lotus-type porous stainless steel by vapour deposition technique
T Ikeda; H Nakajima, Titanium film was deposited by vapour deposition method on lotus-type porous stainless steel SUS304L fabricated by continuous zone melting technique in hydrogen atmosphere in order to obtain good biocompatibility. Titanium film of several micrometers in thickness was coated on the surface inside pores, while that of 20-30 mum was on the flat surface of the specimen. Tensile tests were carried out to evaluate the adhesive strength between titanium layer and substrate of stainless steel. It was found that the adhesive strength was strong enough for the use for biomedical devices. (C) 2004 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE BV
MATERIALS LETTERS, 2004年11月, ［査読有り］

Sound absorption characteristics of lotus-type porous copper fabricated by unidirectional solidification
ZK Xie; T Ikeda; Y Okuda; H Nakajima, Lotus-type porous copper with large number of unidirectional cylindrical pores was fabricated by unidirectional solidification of melt dissolving hydrogen in a pressurized hydrogen atmosphere. The sound absorption coefficient of the porous copper plate, which has many open pores, was measured by standing-wave method in the frequency range up to 4 kHz. The absorption coefficient increases with increasing frequency. The absorption coefficient increases with increasing porosity and specimen thickness, while it decreases with increasing pore diameter. In addition, it was understood that the absorption coefficient of lotus-type porous materials could be evaluated by using the attenuation constant. (C) 2004 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE SA
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004年11月, ［査読有り］

L12型およびL10型金属間化合物,規則合金における原子の拡散 (特集2 金属拡散研究のすべて(下))
野瀬 嘉太郎; 池田 輝之; 中嶋 英雄, アグネ技術センター
金属, 2004年10月

金属拡散研究のすべて(下)L1₂型およびL1₀型金属間化合物,規則合金における原子の拡散
野瀬嘉太郎; 池田輝之; 中嶋英雄, アグネ技術センター
金属, 2004年10月01日

Characteristics of sound absorption in lotus-type porous magnesium
ZK Xie; T Ikeda; Y Okuda; H Nakajima, Lotus-type porous magnesium with many unidirectional cylindrical pores was fabricated by unidirectional solidification of a melt dissolving hydrogen in a pressurized hydrogen atmosphere. The sound absorption coefficient of porous magnesium whose specimen face has many open pores was measured by the standing-wave method in the sound frequency range up to 4 kHz. The absorption coefficient increases with decreasing pore size, while it increases with porosity. Moreover, the peak value with a high absorption coefficient is shifted toward a higher sound frequency when the thickness of the porous magnesium specimen decreases. It is suggested that lotus-type porous magnesium exhibits excellent sound absorption characteristics., INST PURE APPLIED PHYSICS
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 2004年10月, ［査読有り］

Tracer diffusion in Pt3Fe ordered alloys
Y Nose; T Ikeda; H Nakajima; H Numakura, Tracer diffusion coefficients of Fe and Pd in L1(2)-Pt3Fe ordered alloys have been measured in the temperature range between 1223 K and 1663 K, which is through the order-disorder transformation temperature. The diffusion coefficient of Fe, D-Fe(*), increases with increasing Fe composition, while that of Pd, D-Pd(*), is almost independent of the composition. Both diffusion coefficients obey the Arrhenius law at temperatures up to 1374 K, while in the higher temperature range approaching the order-disorder transformation temperature, they show upward curvature. In the higher temperature range it has also been observed that the diffusion coefficient of Fe is larger than that of Pd, which is opposite to the diffusion behavior at lower temperatures. Using defect concentrations calculated by the thermodynamic model, the diffusion behavior in Pt3Fe ordered alloys can be understood within the framework of the alpha sublattice vacancy mechanism., CARL HANSER VERLAG
ZEITSCHRIFT FUR METALLKUNDE, 2004年10月, ［査読有り］

ロータス型ポーラス金属の疲労特性
佐々木新悟; 関宏範; 山崎信哉; 大塚正久; 玄丞均; 池田輝之; 中嶋英雄
日本金属学会講演概要, 2004年09月28日

ロータス型ポーラスマグネシウムおよびその合金の作製と機械的性質
池田輝之; 星山英男; 中嶋英雄
軽金属, 2004年09月

Heat transfer capacity of lotus-type porous copper heat sink
H Chiba; T Ogushi; H Nakajima; T Ikeda, Lotus-type porous copper is a form of copper that includes many straight pores, which are produced by the precipitation of supersaturated gas dissolved in the molten metal during solidification. The lotus-type porous copper is attractive as a heat sink because a higher heat transfer capacity is obtained as the pore diameter decreases. We investigate a fin model for predicting the heat transfer capacity of the lotus-type porous copper. Its heat transfer capacity is verified to be predictable via the straight fin model, in which heat conduction in the porous metal and the heat transfer to the fluid in the pores are taken into consideration by comparison with a numerical analysis. We both experimentally and analytically determine the heat transfer capacities of three types of heat sink: with conventional groove fins, with groove fins that have a smaller fin gap (micro-channels) and with lotus-type porous copper fins. The conventional groove fins have a fin gap of 3 mm and a fin thickness of 1 mm, the micro-channels have a fin gap of 0.5 mm and a fin thickness of 0.5 mm, and the lotus-type porous copper fins have pores with a diameter of 0.3 mm and a porosity of 0.39. The lotus-type porous copper fins were found to have a heat transfer capacity 4 times greater than the conventional groove fins and 1.3 times greater than the micro-channel heat sink under the same pumping power., JAPAN SOC MECHANICAL ENGINEERS
JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING, 2004年08月

連続帯溶融法による一方向微細孔を有するポーラスステンレス鋼の作製 (特集「ポーラス金属の開発最前線」)
池田 輝之; 青木 健; 中嶋 英雄, アグネ技術センター
金属, 2004年07月

204 3次元FEMによるロータス型ポーラス金属のレーザ溶け込み形状の検討
津村 卓也; 村上 太一; 中田 一博; 池田 輝之; 中嶋 英雄, 社団法人溶接学会
溶接学会全国大会講演概要, 2004年03月21日

一方向凝固法によって作製されたロータス型ポーラス銅の吸音特性
謝 振凱; 池田 輝之; 奥田 良行; 中嶋 英雄, Lotus-type porous copper with a high number of unidirectional cylindrical pores was fabricated by unidirectional solidification of melt dissolving hydrogen in a pressurized hydrogen atmosphere.
The sound absorption coefficient of porous copper whose specimen face has many open pores was measured by a standing-wave method in the range up to the sound frequency of 4 kHz. The absorption coefficient increases with increasing frequency.
The absorption coefficient increases with increasing porosity and specimen thickness, while it decreases with increasing pore size. In addition, it was understood that the absorption coefficient of lotus-type porous materials can be determined by using the attenuation constant., 日本金属学会
日本金屬學會誌 = Journal of the Japan Institute of Metals, 2004年03月

Anisotropic Fusion Zone of Lotus-type Porous Metals by Laser Welding　　　　　　　　　　　　　　　
Taichi Murakami; Takuya Tsumura; Kazuhiro Nakata; Teruyuki Ikeda; Hideo Nakajima; Masao Ushio
International Symposium on Novel Materials Processing by Advanced Electromagnetic Energy Sources, 2004年03月, ［査読有り］

ロータス型ポーラスNi_3Al金属間合物の作製
玄 丞均; 池田 輝之; 中嶋 英雄, Lotus-type porous Ni(3)AI intermetallics (Ni-15 mol%Al, Ni-28 mol%Al and Ni-31 mol%Al) whose long cylindrical pores are aligned in one direction have been fabricated by unidirectional solidification of the melt in a pressurized hydrogen gas. The porosity and the pore size are decreased with increasing aluminum content. An increase of solidification velocity from 0.33 to 0.50 mms(-1) leads to a decrease of pore diameter and an increase of pore number in lotus-type porous Ni-28 mol% Al., 日本金属学会
日本金屬學會誌 = Journal of the Japan Institute of Metals, 2004年02月

連続帯溶融法によるロータス型ポーラス炭素鋼の作製と引張・圧縮特性
久次米 利彦; 玄 丞均; 池田 輝之; 山嶋 英雄
高温学会誌, 2004年01月30日

Measurement and analysis of effective thermal conductivities of lotus-type porous copper　　　　　　　　　　　　　　　
T. Ogushi; H. Chiba; H. Nakajima; T. Ikeda
J. Appl. Phys., 2004年, ［査読有り］

協会の活動から 戦略的研究課題報告要旨(平成13,14年度) ロータス型ポーラス鉄鋼を用いた軽量構造材料の開発
中島 英雄; 池田 輝之; 村上 健児, 日本鉄鋼協会
ふぇらむ, 2004年

一方向に伸びた多数の微細孔を有するポーラス金属
玄丞均,池田輝之,中嶋英雄, ティ-・アイ・シ-
マテリアルインテグレーション, 2004年

連続帯溶融法によるロータス型ポーラスステンレス鋼の作製
池田 輝之; 青木 健; 中嶋 英雄, Lotus-type porous stainless steel (SUS304L) rods were fabricated by continuous zone melting technique under pressurised gases of hydrogen and inert gas such as argon or helium. The pores with cylindrical shape, whose growth direction is parallel to the solidification direction, were observed in the rods. The dependence of the porosity and pore diameter on the partial pressure of hydrogen or the total pressure and on the transference velocity of rods was investigated. It was found that the porosity increases with increasing partial pressure of hydrogen under the constant total pressure and t..., 社団法人日本鉄鋼協会
鐵と鋼 : 日本鐡鋼協會々誌, 2004年01月

Measurement and aanalysis of sound absorption of porous magnesium
ZK Xie; T Ikeda; Y Okuda; H Nakajima, Lotus-type porous magnesium whose long cylindrical pores were aligned in one direction was fabricated by unidirectional solidification of the melt dissolving hydrogen in a pressurized hydrogen atmosphere. The sound absorption coefficient of porous magnesium whose specimen face has many open pores was measured by standing-wave method in the range up to the frequency of sound of 4 kHz. The relationship between absorption coefficient and pore structure of porous magnesium was studied. The absorption coefficient increases with decrease of the pore size, while it increases with increase of the porosity. Moreover, the peak value with high absorption coefficient is shifted toward higher frequency of sound when the thickness of the porous magnesium specimen decreases., TRANS TECH PUBLICATIONS LTD
DESIGNING, PROCESSING AND PROPERTIES OF ADVANCED ENGINEERING MATERIALS, PTS 1 AND 2, 2004年, ［査読有り］

Elastic constants of lotus-type porous magnesium: Comparison with effective-mean-field theory
M. Tane; T. Ichitsubo; M. Hirao; T. Ikeda; H. Nakajima
Journal of Applied Physics, 2004年, ［査読有り］

Temperature dependence of elastic constants of lotus-type porous copper
M. Tane; T. Ichitsubo; M. Hirao; R. Takeda; T. Ikeda; H. Nakajima
Materials Letters, 2004年, ［査読有り］

水素雰囲気下で一方向凝固法により作製したポーラスマグネシウム合金のポア形態とミクロ組織
星山 英男; 池田 輝之; 村上 健児; 中嶋 英雄, Porous magnesium alloys, Mg-9Al-0.75Zn(AZ91D), Mg 3Al-1Zn(AZ31B), Mg-3Al-0.25Zn(AZ91D dilution with magnesium), were fabricated by unidirectional solidification under various pressures of hydrogen. Optical micrographic observation of cross-sections of the porous magnesium alloys shows that cylindrical pores are aligned in the direction parallel to the solidification direction in the vicinity of bottom of the ingots, while spherical pores are evolved in the region apart from the bottom. The number of the cylindrical pores depends on the concentration of the alloying elements and the solidification velocity. The difference in pore morphology was discussed in the light of the equilibrium phase diagrams., 日本金属学会
日本金屬學會誌, 2003年12月

ロータス型ポーラスマグネシウムの吸音特性
謝 振凱; 池田 輝之; 奥田 良行; 中嶋 英雄, Lotus-type porous magnesium was fabricated by unidirectional solidification of melt dissolving hydrogen in a pressurized hydrogen atmosphere, which possesses many unidirectional cylindrical pores.
The sound absorption coefficient of porous magnesium whose sample face has many open pores was measured by standing-wave method in the range up to the frequency of sound of 4 kHz.
The absorption coefficient increases with decrease of the pore size, while it increases with increase of the porosity. Moreover, the peak value with high absorption coefficient is shifted toward higher frequency of sound when the thickness of the porous magnesium sample decreases., 日本金属学会
日本金屬學會誌, 2003年12月

ハイドロキシアパタイト超薄膜／ロータス型ポーラス金属複合インプラントの作製　　　　　　　　　　　　　　　
川島将実; 本津茂樹; 西川博昭; 細井美彦; 樋口裕一; 池田輝之; 中嶋英雄
Orthopaedic Ceramic Implants, 2003年12月, ［査読有り］

Anisotropic elastic constants of lotus-structured porous metals
M. Tane; T. Ichitsubo; H. Ogi; M. Hirao; T. Ikeda; H. Nakajima
Cellular Metals: Manufacture, Properties and Applications (Eds: J. Banhart, N. Fleck, and A. Mortensen), 2003年12月, ［査読有り］

Re-examination of phase diagram of Fe-Pt system
Y Nose; A Kushida; T Ikeda; H Nakajima; K Tanaka; H Numakura, The phase boundaries pertaining to gamma(2) (FePt) and gamma(3) (FePt3) phases in the Fe-Pt system have been re-exammed by measuring (1) the compositions of interphase boundaries in diffusion couples, (2) the equilibrium compositions in two-phase alloys and (3) the electrical resistivity as a function of temperature. The results obtained by the three methods are consistent with each other. The gamma (fcc solid solution) <----> gamma(2) + gamma(3) eutectoid has been found to be located at a point higher in Pt concentration and lower in temperature than in the currently adopted phase diagram, the stability range of the gamma(2) phase exhibits considerable asymmetry. Other phase boundaries, as well as the ferromagnetic <----> paramagnetic transition in the gamma(2) phase detected by the resistivity measurements, are in fair agreement with the data in the literature., JAPAN INST METALS
MATERIALS TRANSACTIONS, 2003年12月

B12-114 Heat Transfer Capacity of Lotus-Type Porous Copper Heat Sink
CHIBA Hiroshi; OGUSHI Tetsuro; NAKAJIMA Hideo; IKEDA Teruyuki, Lotus-type porous copper is a porous metal made of copper with many straight pores that are formed by the precipitation of the supersaturated gas dissolved in the melted metal when it is solidified. The lotus-type porous copper is attractive as a heat sink, because the larger heat transfer capacity is obtained as the diameter of the pore is becoming smaller. A fin model for predicting the heat transfer capacity of the lotus-type porous copper was investigated. The heat transfer capacity of it was verified to be predictable from the straight fin model in which heat conduction in the porous m..., 一般社団法人日本機械学会
International Symposium on Micro-Mechanical Engineering : ISMME, 2003年11月30日

第3回セル状金属および発泡金属に関する国際会議報告 : MetFoam 2003
池田 輝之; 玄 丞均
まてりあ : 日本金属学会会報, 2003年11月20日

超音波共鳴法によるロータス型ポーラスマグネシウムの弾性定数測定
多根 正和; 市坪 哲; 武田 亮; 平尾 雅彦; 池田 輝之; 中嶋 英雄, We measured the anisotropic elastic constants of a lotus-type porous magnesium, which possesses cylindrical pores aligned unidirectionally. We used the combination of resonant ultrasound spectroscopy and electromagnetic acoustic resonance methods to determine a complete set of the elastic constants. The acoustic measurements revealed that lotus magnesium shows hexagonal elastic symmetry with the c-axis along the longitudinal direction of the pores. Young's modulus E-parallel to parallel to the pore direction decreases linearly with porosity, while the normal Young's modulus E-perpendicular to drops rapidly., 日本金属学会
日本金屬學會誌, 2003年09月

TiAl単結晶における不純物拡散
野瀬 嘉太郎; 寺下 直宏; 池田 輝之; 中嶋 英雄
高温学会誌, 2003年07月20日

ロータス型ポーラスステンレス鋼の組織と機械的性質
池田 輝之; 青木 健; 塚本 道玄; 玄 丞均; 中嶋 英雄
材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2003年03月01日

水素雰囲気下における一方向凝固によるロータス型ポーラスステンレス鋼の作製
池田 輝之; 青木 健; 塚本 道玄; 玄 丞均; 中嶋 英雄
材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2003年03月01日

連続凝固法によって作製したロータス型ポーラス鉄の機械的性質
玄 丞均; 池田 輝之; 中嶋 英雄
材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2003年03月01日

窒素雰囲気でのロータス型ポーラス鉄の作製
玄 丞均; 池田 輝之; 中嶋 英雄
材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2003年03月01日

連続帯溶融法によるロータス型ポーラス鉄鋼の製造法の開発
中嶋 英雄; 玄 丞均; 池田 輝之
材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2003年03月01日

金属系新素材・ポーラスマグネシウムの吸音性
謝 振凱; 奥田 良行; 玄 丞均; 池田 輝之; 村上 健児; 中嶋 英雄
高温学会誌, 2003年01月20日

Diffusion of 59Fe in g-TiAl single crystals　　　　　　　　　　　　　　　
N. Terashita; Y. Nose; T. Ikeda; H. Nakajima; H. Inui; M. Yamaguchi
Mater. Lett., 2003年, ［査読有り］

Self-diffusion of titanium in single crystalline g-TiAl　　　　　　　　　　　　　　　
T. Ikeda; H. Nakajima
Def. Diff. Forum, 2003年, ［査読有り］

Weld fusion property of lotus-type porous cooper by laser beam irradiation
T. Murakami; K. Nakata; T. Ikeda; H. Nakajima; Masao Ushio
Mater. Sci. Eng., 2003年, ［査読有り］

Fabrication of lotus-type porous brass by zinc diffusion into porous copper
T Aoki; T Ikeda; H Nakajima, Lotus-type porous brass has been fabricated by utilizing solid-state diffusion of zinc into porous copper which has been made by unidirectional solidification in pressurized hydrogen gas. The Zn diffusion has been carried out by thermal annealing of the porous copper. Zn was deposited by electroplating or vapor deposition method. It has been shown that the diffusion method is a very efficient okay to synthesize the lotus-type porous alloys with a suitable composition., JAPAN INST METALS
MATERIALS TRANSACTIONS, 2003年01月

ロータス型ポーラス銅の異方的弾性定数
多根正和; 市坪哲; 荻博次; 平尾雅彦; 池田輝之; 中嶋英雄, 日本伸銅協会
銅と銅合金, 2003年01月, ［査読有り］

Tracer and chemical diffusion in L1(2)-ordered Pt3Fe
Y Nose; T Ikeda; H Nakajima; H Numakura, The tracer diffusion coefficient of Fe and the chemical diffusion coefficient in L1(2)-ordered Pt3Fe have been measured at temperatures below the order-disorder transition temperature. The tracer diffusion coefficient of Fe in a nearly stoichiometric alloy is curved upwards in the Arrhenius plot on approaching the order-disorder transition temperature. The chemical diffusion coefficient is about 10-30 times larger than the diffusion coefficient of Fe. The tracer diffusion coefficient is influenced by composition, namely, it increases with increasing the concentration of Fe through the stoichiometric composition, but this trend almost vanishes at higher temperatures. The chemical diffusion coefficient is virtually independent of composition. The tracer diffusion coefficient of Pt has been estimated from the Darken-Manning relation. At 1223 K, it is in between the chemical diffusion coefficient and the tracer diffusion coefficient of Fe., JAPAN INST METALS
MATERIALS TRANSACTIONS, 2003年01月

Tracer and chemical diffusion in L1(2)-ordered Pt3Fe
Y Nose; T Ikeda; H Nakajima; H Numakura, The tracer diffusion coefficient of Fe and the chemical diffusion coefficient in L1(2)-ordered Pt3Fe have been measured at temperatures below the order-disorder transition temperature. The tracer diffusion coefficient of Fe in a nearly stoichiometric alloy is curved upwards in the Arrhenius plot on approaching the order-disorder transition temperature. The chemical diffusion coefficient is about 10-30 times larger than the diffusion coefficient of Fe. The tracer diffusion coefficient is influenced by composition, namely, it increases with increasing the concentration of Fe through the stoichiometric composition, but this trend almost vanishes at higher temperatures. The chemical diffusion coefficient is virtually independent of composition. The tracer diffusion coefficient of Pt has been estimated from the Darken-Manning relation. At 1223 K, it is in between the chemical diffusion coefficient and the tracer diffusion coefficient of Fe., JAPAN INST METALS
MATERIALS TRANSACTIONS, 2003年01月

ロータス型ポーラスマグネシウムの作製と機械的性質
池田 輝之; 中嶋 英雄, Lotus-type porous magnesium, in which countless small pores elongated in the solidification direction are dispersed, was fabricated by unidirectional solidification under hydrogen atmosphere. Ingots with various sets of porosities and averaged pore diameter can be obtained by controlling the pressure of hydrogen atmosphere. In the present experiments, porous magnesium ingots with porosities and averaged pore diameters in the range of 0～50% and 60～800μm were fabricated. These materials are very light weight ; porous magnesium with 50% porosity has a density of 0.87g/cm³ and floats in water. The anisotropy in tensile strength of porous magnesium was observed and it was found that the tensile strength in the direction parallel to the pores is higher than that perpendicular., 日本鋳造工学会
鋳造工学 = Journal of Japan Foundry Engineering Society, 2002年12月25日

Fabrication of lotus-type porous stainless steel by unidirectional solidification under hydrogen atmosphere
T Ikeda; M Tsukamoto; H Nakajima, Lotus-type porous stainless steel SUS304L has been fabricated by unidirectional solidification under mixed gases of hydrogen and argon. The atmospheric pressure dependence of porosity and pore diameter has been investigated. The porosity is lower if the partial pressure of argon is higher under a constant partial pressure of hydrogen and is higher if the partial pressure of hydrogen is higher under a constant total pressure of atmosphere composing of hydrogen and argon. Average pore diameter increases with increasing distance from the bottom chill plane. From tensile tests, the ultimate tensile strength of the porous stainless steel with porosity about 50% has been found to be about 7 times lower than nonporous alloy in the direction perpendicular to pore growth direction., JAPAN INST METALS
MATERIALS TRANSACTIONS, 2002年11月

ロータス型ポーラスマグネシウムの構造と機械的性質
関 宏範; 村岡 浩太郎; 大塚 正久; 池田 輝之; 中嶋 英雄
大会講演概要, 2002年10月16日

ロータス型ポーラス鉄-クロム合金およびステンレス鋼の作製と機械的性質
池田 輝之; 塚本 道玄; 中嶋 英雄
材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2002年09月01日

ロータス型ポーラス鉄の機械的性質
中嶋 英雄; 玄 丞均; 池田 輝之
材料とプロセス : 日本鉄鋼協会講演論文集 = Current advances in materials and processes : report of the ISIJ meeting, 2002年09月01日

Anisotropic Elastic Constants of Lotus-Type Porous Copper : Measurements and Micromechanics Modeling
T. Ichitsubo; M. Tane; H. Ogi; M. Hirao; T. Ikeda; H. Nakajima, We studied the elastic constants of a lotus-type porous copper, regarding it as a composite material showing hexagonal elastic symmetry with the c-axis along the longitudinal direction of the pores. We used the combination of resonance ultrasound spectroscopy and electromagnetic acoustic resonance methods to determine the elastic constants of the composite. The resulting Young's modulus E-parallel to decreases linearly and c(33) does slowly with porosity, while E-perpendicular to and c(11) drop rapidly and then slowly. Micromechanics calculations considering the elastic anisotropy of the copper matrix can reproduce the measured anisotropic elastic constants. This indicates that the elastic properties of various types of porous metals can be predicted and designed with the present approach using micromechanics modeling., PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Acta Materialia, 2002年09月, ［査読有り］

金属間化合物や規則合金における原子の拡散 (特集 大阪大学産業科学研究所 マテリアルインテグレーション--材料・生体・情報の融合を目指して(2))
池田 輝之; 中嶋 英雄, ティ-・アイ・シ-
マテリアルインテグレ-ション, 2002年08月

ロータス型ポーラス金属の作製と機械的性質 (特集 大阪大学産業科学研究所 マテリアルインテグレーション--材料・生体・情報の融合を目指して(2))
玄 丞均; 池田 輝之; 村上 健児, ティ-・アイ・シ-
マテリアルインテグレ-ション, 2002年08月

Anisotropic elastic constants of unidirectional porous copper measured with resonance ultrasound spectroscopy　　　　　　　　　　　　　　　
T. Ichitsubo; M. Tane; H. Ogi; M. Hirao; T. Ikeda; H. Nakajima
Proceedings of 11th International Symposium on Nondestructive Characterization of Materials, 2002年06月, ［査読有り］

ハイドロキシアパタイト薄膜被覆ロータス型ポーラスステンレス鋼インプラントの作製
本津 茂樹; 赤井 正哉; 池田 輝之; 西川 博昭; 細井 美彦; 中嶋 英雄, 日本バイオマテリアル学会
生体材料, 2001年10月10日

Diffusion of 44Ti and 63Ni in TiAl single crystal
T. Ikeda; H. Kadowaki; H. Nakajima, Tracer diffusion of 44Ti and 63Ni in γ-TiAl has been investigated using single crystal samples by the ion-beam sputter-sectioning technique in the temperature range from 1133 to 1307 K and from 1053 to 1278 K, respectively. The tracer diffusion coefficients have been measured in the directions parallel and perpendicular to [001] axis. The diffusion of 44Ti in the direction perpendicular to the [001] axis is almost an order of magnitude faster than that parallel to the [001] direction. The cause of the anisotropy of the diffusion coefficient has been discussed in view of the defect structure and the correlation of the jump vectors of successive vacancy jumps. On the other hand, the anisotropy for 63Ni diffusion is less significant. It is suggested that Ni atoms diffuse more randomly in the two kinds of sublattices. © 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
Acta Materialia, 2001年10月09日

Diffusion of Ti-44 and Ni-63 in TiAl single crystal
T Ikeda; H Kadowaki; H Nakajima, Tracer diffusion of Ti-44 and Ni-63 in gamma -TiAl has been investigated using single crystal samples by the ion-beam sputter-sectioning technique in the temperature range from 1133 to 1307 K and from 1053 to 1278 K. respectively. The tracer diffusion coefficients have been measured in the directions parallel and perpendicular to [001] axis. The diffusion of Ti-44 in the direction perpendicular to the [001] axis is almost an order of magnitude faster than that parallel to the [001] direction. The cause of the anisotropy of the diffusion coefficient has been discussed in view of the defect structure and the correlation of the jump vectors of successive vacancy jumps. On the other hand, the anisotropy for Ni-63 diffusion is less significant. It is suggested that Ni atoms diffuse more randomly in the two kinds of sublattices. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 2001年10月

ハイドロキシアパタイト薄膜被覆ロータス型ポーラスステンレス鋼インプラントの作製　　　　　　　　　　　　　　　
本津茂樹; 赤井正哉; 池田輝之; 西川博昭; 細井美彦; 中嶋英雄
生体材料, 2001年10月, ［査読有り］

Thermodynamic activity of Ga in Ni3Ga (Reprinted from Journal of the Japan Institute of Metals, vol 64, pg 202-206, 2000)
A Kushida; T Ikeda; H Numakura; M Koiwa, Thermodynamic activity of Ca in the Lit-ordered intermetallic phase Ni3Ga has been determined by measuring the electromotive force of a galvanic cell with zirconia solid-electrolyte,
Ni-Ga, Ga2O3/ZrO2(+Y2O3)/Ga, Ga2O3
in the temperature range between 1050 and 1300K for six compositions. The activity of Ga varies with composition most steeply at the stoichiometric composition (25 mol%Ga), the dependence being more pronounced at low temperatures. By applying a thermodynamic model based on the Bragg-Williams approximation (Ikeda et ral.: Acta Mater. 46 (1998) 6605-6613), the effective pair interaction energy between Ni and Ga atoms has been determined to be 9.75 +/- 0.19 kJ/mol. The thermodynamic factor in chemical diffusion in the L1(2) phase has been derived from the composition dependence of the thermodynamic activity., JAPAN INST METALS
MATERIALS TRANSACTIONS, 2001年03月

ロータス型ポーラス銅の圧縮強度
玄 丞均; 池田 輝之; 村上 健児; 中嶋 英雄
高温学会誌, 2001年01月20日

Diffusion in Ni3Al, Ni3Ga, Ni3Ge　　　　　　　　　　　　　　　
H. Numakura; T. Ikeda; H. Nakajima; M. Koiwa
Mater. Sci. Eng., 2001年, ［査読有り］

Diffusion of 44Ti and 63Ni in single crystal TiAl　　　　　　　　　　　　　　　
H. Kadowaki; T. Ikeda; H. Nakajima; H. Inui; M. Yamaguchi
Def. Diff. Forum, 2001年, ［査読有り］

Thermodynamic activity of Ga in Ni3Ga　　　　　　　　　　　　　　　
A. Kushida; T. Ikeda; H. Numakura; M. Koiwa
Mater. Trans., 2001年, ［査読有り］

Tracer diffusion of 44Ti in TiAl single crystal　　　　　　　　　　　　　　　
T. Ikeda; H. Kadowaki; H. Nakajima; H. Inui; M. Yamaguchi; M. Koiwa
Mater. Sci. Eng., 2001年, ［査読有り］

Tracer diffusion of Ni and Ge in L1(2)-type intermetallic compound Ni3Ge
T Ikeda; H Nakajima; H Numakura; M Koiwa, The diffusion coefficients of Ni-63 and Ge-68 in Ni3Ge with three compositions from 23.2 to 24.5 at.% Ge have been measured by the conventional radioactive tracer technique in the temperature range from 1064 to 1323 K. The diffusion coefficient of Ge at 1223 K. for example, is from 100 to 300 times smaller than that of Ni. The diffusion coefficient of Ni is almost independent of composition, whereas that of Ge decreases with increasing the concentration of Ge towards the exact stoichiometry. On the basis of the experimental data, the mechanism of diffusion is discussed., SCITEC PUBLICATIONS LTD
DIFFUSIONS IN MATERIALS: DIMAT2000, PTS 1 & 2, 2001年, ［査読有り］

Tracer diffusion in Ni3Ga and its relation to thermodynamic properties
T Ikeda; H Numakura; H Nakajima; M Koiwa, The tracer diffusion coefficients of Ni and Ga in Ni3Ga at compositions of 24.2, 25.6 and 26.2 at.% Ga have been measured at temperatures from 1123 K to 1323 K. The ratio of the diffusion coefficients, D-Ga*/D-Ni*, is in the range between 0.25 and 1.3 for the temperatures and compositions studied. The diffusion coefficients of Ni and Ga both increase with the increase in the Ga concentration, the dependence on composition being stronger for Ga. The relation between the diffusion coefficients and the thermodynamic properties, in particular, the equilibrium concentrations of point defects, is discussed., SCITEC PUBLICATIONS LTD
DIFFUSIONS IN MATERIALS: DIMAT2000, PTS 1 & 2, 2001年, ［査読有り］

Tracer and chemical diffusion in Pt3Fe
Y Nose; H Numakura; M Koiwa; T Ikeda; H Nakajima, The tracer diffusion coefficient of Fe and the chemical diffusion coefficient in the L1(2)-ordered alloy Pt3Fe have been measured at temperatures in the range from 1223 to 1374 K. The tracer diffusion coefficient of Fe is markedly smaller than that of Fe in pure Pt. It increases with increasing the Fe concentration. The chemical diffusion coefficient is about 10 times larger than the tracer diffusion coefficient of Fe, and is independent of the composition. The tracer diffusion coefficient of Pt in Pt3Fe is estimated by the Darken-Manning relation. Its magnitude is in between the tracer diffusion coefficient of Fe and the chemical diffusion coefficient., SCITEC PUBLICATIONS LTD
DIFFUSIONS IN MATERIALS: DIMAT2000, PTS 1 & 2, 2001年, ［査読有り］

Point defects and diffusion in nickel-based L1(2)-ordered compounds
H Numakura; T Ikeda; H Nakajima; M Koiwa, The properties of intrinsic point defects and the mechanism of atomic diffusion in nickel-based L1(2)-ordered intermetallic compounds, Ni3Al, Ni3Ga and Ni3Ge, are discussed. Experimental data show that the tracer diffusion coefficients of the majority component, Ni, in the three compounds are of the same order of magnitude, while in contrast those of the minority component are widely different from each other. These common and distinctive features can be understood in terms of a recently-proposed model of diffusion, where both of the two species of atoms are assumed to diffuse over the sublattice of the majority component by the ordinary vacancy mechanism. The diffusion of the majority species is essentially the self-diffusion in the sublattice of its own, while that of the minority species is a sort of impurity diffusion of antisite atoms. The wide differences in the diffusivities of the minority species must stem from differences in the concentration of antisite atoms. The degree of order has a direct influence on diffusion of the minority species., SCITEC PUBLICATIONS LTD
DIFFUSIONS IN MATERIALS: DIMAT2000, PTS 1 & 2, 2001年, ［査読有り］

ロータス型ポーラス銅の機械的性質
玄 丞均; 池田 輝之; 村上 健児; 中嶋 英雄
鋳物 : 講演大会講演概要集, 2000年09月25日

窒素ガスを用いたロータス型ポーラスニッケルの作製
山村 聡; 池田 輝之; 太田 健一; 中嶋 英雄
鋳物 : 講演大会講演概要集, 2000年09月25日

L1_2 型金属間化合物 Ni_3Ge 中の拡散
池田 輝之; 古良田 卓; 中嶋 英雄; 沼倉 宏; 小岩 昌宏, 日本金属学会
まてりあ : 日本金属学会会報, 2000年06月20日

NI_3Ga中の熱力学的活量
櫛田 亜矢子; 池田 輝之; 治倉 宏; 小岩 昌宏, Thermodynamic activity of Ga in the Lit-ordered intermetallic phase Ni3Ga has been determined by measuring the electromotive force of a galvanic cell with zirconia solid electrolyte,
Ni-Ga, Ga2O3\ZrO2(+Y2O3)\Ga, Ga2O3
in the temperature range of 1050-1350 K for six compositions. The activity of Ga varies with composition most steeply at the stoichiometry composition (25%Ga). The dependence on composition is more pronounced at low temperatures. The effective pair interaction energy has been determined to be 9.75+/-0.19 kJ/mol by applying a thermodynamic model based on Bragg-Williams approximation (Ikeda et al., Acta. Mater., 46 (1998), 6605-6613). The thermodynamic factor in diffusion has been derived from the composition dependence of the thermodynamic activity., 日本金属学会
日本金屬學會誌, 2000年03月

γ-TiAl単結晶中におけるNiおよびTiの拡散
門脇 宏和; 池田 輝之; 中嶋 英雄; 乾 晴行; 山口 正治
高温学会誌, 2000年01月20日

「物質」と「材料」- 基礎研究と応用研究のあいだで
池田輝之
まてりあ, 2000年

A Bragg-Williams model for the thermodynamic activity and the thermodynamic factor in diffusion for ordered alloys with substitutional defects
T Ikeda; H Numakura; M Koiwa, A pair interaction model for describing the thermodynamic activities in binary ordered alloys with substitutional defects (antisite atoms) has been formulated in the framework of the Bragg-Williams approximation, taking the ordering energy as the basic parameter. Analytical expressions have been derived for the thermodynamic factor in chemical diffusion. The thermodynamic factor can readily be calculated using the ordering energy obtained by analysing activity data. As examples, experimental data of the thermodynamic activity in AgMg (B2), NiZn (L1(0)) and Ni3Al (L1(2)) have been analysed and the thermodynamic factor vs composition curves are presented. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 1998年11月

Single-phase interdiffusion in Ni3Al
T Ikeda; A Almazouzi; H Numakura; M Koiwa; W Sprengel; H Nakajima, Interdiffusion experiments have been made using single-phase diffusion couples of Ni3Al over the temperature range from 1223 to 1473 K. The interdiffusion coefficient has been obtained from the concentration profiles measured by electron-probe microanalysis. The interdiffusion coefficient, (D) over tilde, is 4-8 times larger than the tracer-diffusion coefficient of Ni, D-Ni*, and increases with increasing Al concentration. For the stoichiometric composition, it is expressed as
(D) over tilde = 10-2.6+/-0.7 exp(-305 +/- 17 kJ/mol/RT) m(2)/s.
reported in the literature and the thermodynamic factor evaluated from experimental data of the thus estimated is smaller by a factor of 3-4 at 1400 K than thermodynamic activity. The magnitude of D-Al* that of D-Ni* in the temperature range examined. For example, D-Al* approximate to (0.25 - 0.38)D-Ni* at 1400 K. (C) 1998 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 1998年09月

Self-diffusion mechanism in Ni-based L1(2) type intermetallic compounds
H Numakura; T Ikeda; M Koiwa; A Almazouzi, We propose a model for the self-diffusion in Ll(2) type A(3)B ordered compounds. In this structure, the atoms of the major element A can diffuse on their own sublattice (alpha sublattice) via the ordinary vacancy mechanism without disturbing the ordered arrangement. For the atoms of the minor element B, the same mechanism is possible for those distributed over the alpha sublattice as antisite atoms. If the number of the antisite atoms is not negligibly small, the long-range diffusion of B can be due largely to their migration over the alpha sublattice as impurity diffusion. The self-diffusion data in Ni3Al, Ni3Ga and Ni3Ge are discussed in the light of this model., TAYLOR & FRANCIS LTD
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1998年04月

Absolute stability conditions in a fuzzy phase-lead compensation and their extension to MIMO systems
K Tanaka; T Ikeda, This paper presents absolute stability conditions in a fuzzy phase-lead compensation and their extension to multi-input-multi-output (MIMO) systems. A theorem which realizes an effective phase-lead compensation is recalled. A so-called "transformation matrix" is derived in the theorem. A fuzzy phase-lead compensator (FPLC) is constructed by using the transformation matrix. The circle condition is employed to derive absolute stability conditions of feedback systems in a fuzzy phase-lead compensation. Next, a generalized class of FPLC's is defined, and its stability conditions are derived from the viewpoints of H-infinity norm and quadratic stability. It is found that the stability conditions realize stability analysis not only for single-input-single-output (SISO) systems, but also for MIMO systems., IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, 1998年04月, ［査読有り］

Point defects and diffusion in Ni3Ga
T Ikeda; A Almazouzi; A Funao; H Numakura; M Koiwa; Y Shirai; K Nonaka; W Sprengel; H Nakajima, The properties of intrinsic point defects and the self-diffusion behaviour of the constituent elements in Ni3Ga have been studied by positron annihilation, tracer diffusion and interdiffusion experiments. Thermal vacancies have been detected by positron lifetime measurements for specimens quenched from high temperatures. The vacancy formation energy is in the range between 1.7 and 1.8 eV, and is not dependent strongly on the composition. The tracer diffusion coefficients of Ni and Ga are of the same order of magnitude, and the interdiffusion coefficient is about 10 times larger than the diffusion coefficient of Ni. The diffusion in Ni3Ga has been found to satisfy the Darken-Manning equation, as expected from the model of the self-diffusion in this type of materials, where both the species of atoms are assumed to migrate primarily in the sublattice of the major element via the ordinary vacancy mechanism., MATERIALS RESEARCH SOCIETY
DIFFUSION MECHANISMS IN CRYSTALLINE MATERIALS, 1998年, ［査読有り］

Self-diffusion in L1(2)-type intermetallic compounds Ni3Ge and Ni3Ga
K Nonaka; T Arayashiki; H Nakajima; A Almazouzi; K Tanaka; T Ikeda; H Numakura; M Koiwa, Self-diffusion coefficients of constituent elements in Lk-type intermetallic compound Ni3Ge and Ni3Ga have been measured with the radioactive isotope tracer of Ni-63, Ge-68 and Ga-67 using an ion-beam sputter-sectioning technique. Temperature dependence of the diffusivities is, respectively, expressed as in Ni3Ge compound,
D-Ni = 2.5 x 10(-4) exp(-258 +/- 2 kJmol(-1)/RT) m(2)s(-1), D-Ge = 3.5 x 10(-3) exp(-333 +/- 11 kJmol(-1)/RT) m(2)s(-1), and in Ni3Ga compound, D-Ni = 1.7 x 10(-4) exp(-259 +/- 12 kJmol(-1)/RT) m(2)s(-1), D-Ga = 5.3 x 10(-6) exp(-233 +/- 17 kJmol(-1)/RT) m(2)s(-1).
The Ni diffusivity is 127 to 392 times higher than the Ge diffusivity in the temperature range from 1048 to 1206K. This trend is consistent with the expectation based on the geometrical arrangement of Ni and Ge in Ni3Ge. However, the Ni diffusivity is only 1.2 to 2.3 times larger than the Ga diffusivity in the temperature range from 963 to 1177K in Ni3Ga. It is suggested that some Ga atoms are located in both sublattices, and diffuse through jumps between right-site and wrong-site in both sublattices., TRANS TECH-SCITEC PUBLICATIONS LTD
DEFECT AND DIFFUSION FORUM, 1997年, ［査読有り］

Interdiffusion in Ni3Al
T Ikeda; A Almazouzi; H Numakura; M Koiwa; W Sprengel; H Nakajima, Interdiffusion experiments have been made for Ni3Al using single-phase diffusion couples over the temperature range from 1273 K to 1473 K. The interdiffusion coefficient is larger than the self-diffusion coefficient of Ni by about an order of magnitude, and increases with increasing the Al concentration. For the stoichiometric composition, the apparent activation energy and. the pre-exponential factor for the interdiffusion coefficient are 243 +/- 16 kJ mol(-1) and 10(-4.9 +/- 0.6) m(2)s(-1), respectively. An attempt has been made to estimate the self-diffusion coefficient of Al on the basis of the Darken-Manning equation., TRANS TECH-SCITEC PUBLICATIONS LTD
DEFECT AND DIFFUSION FORUM, 1997年, ［査読有り］

Diffusion mechanisms in some Ni-based intermetallic compounds
T Ikeda; H Numakura; M Koiwa, Mechanisms of diffusion are discussed for intermetallic compounds of two common structures, B2 and L1(2). For a B2 compound, NiAl, the temperature dependence of the diffusion coefficient via the six jump cycle is calculated by using numerical data for the energy-displacement curve by Mishin and Farkas. For L1(2) compounds, the experimental data for self-diffusion coefficients in Ni3Al, Ni3Ga and Ni3Ge are compared; the self diffusion coefficient of Al in Ni3Al has been estimated by analysing the interdiffusion data. The sublattice vacancy mechanism is suggested to be operative for the diffusion of both the major element (Ni) and the minor element (Al, Ga or Ge)., MINERALS, METALS & MATERIALS SOC
THERMEC '97 - INTERNATIONAL CONFERENCE ON THERMOMECHANICAL PROCESSING OF STEELS AND OTHER MATERIALS, VOLS I-II, 1997年, ［査読有り］

Local atomic structures of Zn70Ga10Ni20 amorphous alloys by the anomalous X-ray scattering method
T. Ikeda; E. Matsubara; Y. Waseda; A. Inoue; T. Chang; T. Masumoto, The atomic structures of Zr₇₀Ga₁₀Ni₂₀ amorphous alloys exhibiting a wide supercooled liquid region have been studied by the anomalous X-ray scattering (AXS) method. The local atomic structures around Zr, Ga and Ni have been determined in the amorphous samples as-quenched and annealed in the supercooled liquid region so that the atomic structure in the supercooled liquid region was compared with the one in the as-quenched state. The structural analyses and differential scanning calorimetry (DSC) traces in the as-quenched and annealed samples indicate that a structural change in the environment for Zr due to annealing in the supercooled liquid region is closely related with the thermal stability in the present amorphous alloy. In the crystallized sample prepared by annealing the as-quenched amorphous alloy for a long time in a supercooled liquid region, the precipitated phases have been determined to be Zr₂Ni and Zr₆Ga₂Ni by analyzing the energy-differential intensity profiles at Zr, Ga and Ni K absorption edges., 社団法人 日本金属学会
Mater. Trans. JIM, 1995年, ［査読有り］

Stability analysis of feedback systems in fuzzy phase-lead compensation
K TANAKA; T IKEDA, I E E E
1995 IEEE INTERNATIONAL CONFERENCE ON SYSTEMS, MAN AND CYBERNETICS, VOLS 1-5, 1995年, ［査読有り］

焼結拡散マルチプル法を用いた多元素組成空間における材料探索
池田輝之; 百合嶋隆太; 趙至洋; 池田亜矢子
まてりあ, 2025年01月
筆頭著者

日本金属学会第173回講演大会報告
池田輝之
日本熱電学会誌, 2023年12月
筆頭著者

多元素組成空間における環境親和型熱電材料のハイスループット探索
池田輝之,池田亜矢子
金属, 2023年01月01日, ［招待有り］
筆頭著者

汎用元素のみで構成する熱電発電モジュールの開発
高際 良樹、池田 輝之、小島 宏康
クリーンエネルギー, 2020年02月

流体透過性多孔質熱電材料を用いた新しい熱電変換モジュール
池田輝之,佐々木誠,永野隆敏
クリーンエネルギー, 2020年01月, ［招待有り］

平成30 年度物質科学研究会
池田輝之
日本熱電学会誌, 2019年04月, ［招待有り］
筆頭著者

ロータス型多孔質熱電材料を用いた新しい熱電変換デバイスの可能性
池田輝之,永野隆敏,篠嶋妥
機能材料, 2019年, ［招待有り］
筆頭著者

組織便り — グリーンデバイス教育研究センターの活動
池田輝之
多賀工業会会報, 2018年, ［招待有り］
筆頭著者

茨城大学工学部マテリアル工学科「材料組織と機能の研究室」
日本熱電学会誌, 2016年

熱電材料の組織制御のために (3) 組織の定量化
池田輝之
日本熱電学会誌, 2015年12月21日

熱電材料の組織制御のために (2) サイズと形態の制御
池田輝之
日本熱電学会誌, 2015年08月24日

熱電材料の組織制御のために (1) 平衡状態図と各種反応
池田輝之
日本熱電学会誌, 2015年04月14日

バルク熱電材料のナノ構造化
池田輝之
まてりあ, 2014年07月01日

カルテックに滞在して
池田輝之
日本熱電学会誌, 2014年03月26日

高エネルギー非平衡状態を介したナノコンポジット熱電材料の創製
池田 輝之
財団法人日本板硝子材料工学助成会成果報告書 Nippon Sheet Glass Foundation for Materials Science and Engineering report, 2014年

バルク熱電材料への「ハイスループット (high-throughput)」なアプローチ
池田輝之,太田弘道
金属, 2013年10月01日

Structure and high temperature thermoelectric properties of SrAl2Si2 (vol 182, pg 240, 2009)
Susan M. Kauzlarich; Cathie L. Condron; Jonathan K. Wassei; Teruyuki Ikeda; G. Jeffrey Snyder
JOURNAL OF SOLID STATE CHEMISTRY, 2013年02月

Effect of applied-stress direction on compressive properties of lotus-type porous stainless steel
T. Ide; M. Tane; T. Ikeda; S.K. Hyun; H. Nakajima
Porous Metals and Metal Foaming Technology, Ed. H. Nakajima, N. Kanetake, Japan Inst. Met., 2006年

Development of Nanostructures in Thermoelectric Pb-Te-Sb Alloys
T. Ikeda; V.A. Ravi; L. A. Collins; S. M. Haile; G. J. Snyder
25th Int. Conf. on Thermoelect. Proc., Ed. M. Rotter, IEEE, 2006年, ［査読有り］

Solidification processing of Te-Sb-Pb alloys For thermoelectric applications
T. Ikeda; H. Azizgolshani; S. M. Haile; G. J. Snyder; V. A. Ravi
24th Int. Conf. on Thermoelect. Proc., IEEE, 2005年, ［査読有り］

Fabrication of lotus-type porous metals and their physical properties
H Nakajima; T Ikeda; SK Hyun
ADVANCED ENGINEERING MATERIALS, 2004年06月

Compressive deformation behavior of lotus-type porous stainless steel
T. Ide; T. Ikeda; S.K. Hyun; M. Tane; H. Nakajima
Proc. Int. Conf. New Front. Proc. Sci. Eng. Adv. Mater., Ed. M. Naka, T.Yamane, High Temp. Soc. Japan, 2004年

Fabrication of lotus-type porous carbon steel by continuous zone melting method and its mechanical properties
T. Kujime; S.K. Hyun; T. Ikeda; H. Nakajima
Proc. 6th Pacific Rim Int. Conf. Model. Cast. Solid. Proc., 2004年

Fabrication of lotus-type porous iron and its mechanical properties
SK Hyun; T Ikeda; H Nakajima
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, 2004年01月

ロータス型ポーラス金属の溶接溶け込み形状のポア方向依存性
村上太一; 中田一博; 津村卓也; 池田輝之; 中嶋英雄; 牛尾誠夫
日本金属学会講演概要, 2003年10月11日

Fabrication of lotus-type porous metals and physical properties
H. Nakajima; T. Ikeda; S.K. Hyun
3rd Int. Conf. Cell. Met. Met. Foam. Technol., Ed. J. Banhart, N. Fleck, A. Mortensen, Verlag MIT Publ., 2003年, ［査読有り］

Measurement and analysis of effective thermal conductivities of lotus-type porous copper
T. Ogushi; H. Chiba; H. Nakajima; T. Ikeda
3rd Int. Conf. Cell. Met. Met. Foam. Technol., Ed. J. Banhart, N. Fleck, A. Mortensen, Verlag MIT Publ., 2003年, ［査読有り］

Melting of lotus-type porous copper in laser beam welding
T. Murakami; K. Nakata; T. Ikeda; H. Nakajima; M. Ushio
3rd Int. Conf. Cell. Met. Met. Foam. Technol., Ed. J. Banhart, N. Fleck, A. Mortensen, Verlag MIT Publ., 2003年, ［査読有り］

Fabrication of lotus-type porous iron and steel and the mechanical properties
S.K. Hyun; H. Nakajima; T. Ikeda
Proc. 8th Japan Int. SAMPE Symp., Ed. N. Takeda, H. Hamada, S. Ogihara, A. Nakai, 2003年, ［査読有り］

Fe tracer diffusion in L1₀ ordered FePt
Y. Nosé; T. Ikeda; H. Nakajima; K. Tanaka; H. Numakura
Materials Research Society Symposium - Proceedings, 2003年, ［査読有り］

Tracer diffusion of Ti and Ni in TiAl single crystal
H. Nakajima; H. Kadowaki; T. Ikeda; H. Inui; M. Yamaguchi
Proc. Int. Conf. Des. Interfac. Struct. Adv. Mater. their Joints, Ed. M. Naka, High Temp. Soc. Japan, 2002年

Fabrication and mechanical properties of lotus-structured porous copper and magnesium
H. Nakajima; S.K. Hyun; T. Ikeda
Acta Techn. Napocensis, 45, 2002年

Pore anisotropy in laser welding of lotus-type porous copper
T. Murakami; K. Nakata; T. Ikeda; H. Nakajima; M. Ushio
Proc. Int. Conf. Des. Interfac. Struct. Adv. Mater. their Joints, Ed. M. Naka, High Temp. Soc. Japan, 2002年

Tracer and chemical diffusion in Fe-Pt ordered alloys
Y. Nose; A. Kushida; T. Ikeda; H. Nakajima; H. Numakura
Proc. Int. Conf. Des. Interfac. Struct. Adv. Mater. their Joints, Ed. M. Naka, High Temp. Soc. Japan, 2002年

Diffusion of 59Fe in TiAl single crystal
N. Terashita; Y. Nose; T. Ikeda; H. Nakajima; H. Inui; M. Yamaguchi
Proc. Int. Conf. Des. Interfac. Struct. Adv. Mater. their Joints, Ed. M. Naka, High Temp. Soc. Japan, 2002年

レンコンのような孔がたくさんあいた金属
池田輝之
The News oFEngineering, Osaka University, 2002年

Diffusion in Ni3Al, Ni3Ga and Ni3Ge
H. Numakura; T. Ikeda; H. Nakajima; M. Koiwa
Materials Science and Engineering A, 2001年

The homogeneity ranges of the L1(2)-type intermetallic compounds Ni3Ga and Ni3Ge
T Ikeda; Y Nose; T Korata; H Numakura; M Koiwa
JOURNAL OF PHASE EQUILIBRIA, 1999年12月

A Bragg-Williams model for the thermodynamic activity and the thermodynamic factor in diffusion for ordered alloys with substitutional defects (vol 46, pg 6605, 1999)
T Ikeda; H Numakura; M Koiwa
ACTA MATERIALIA, 1999年04月

Diffusion of constituent elements in Ni3Ge studied by tracer and interdiffusion experiments
K. Nonaka; T. Arayashiki; H. Nakajima; K. Tanaka; T. Korata; T. Ikeda; H. Numakura; M. Koiwa
The Third Pacific Rim Int. Conf. Adv. Mater. Proc., Ed. M. A. Imam, R. DeNale, S. Hanada, Z. Zhong, D. N. Lee, Min. Met. Mater. Soc., 1998年, ［査読有り］

Thermoelectric Materials
Teruyuki Ikeda, 共著
du Gruyter GmbH, 2020年06月08日
9783110596489

次世代熱電変換材料・モジュール開発と信頼性　　　　　　　　　　　　　　　
池田輝之,池田亜矢子, 共著
シーエムシー出版, 2020年03月05日
9784781314921

米国で得たダイバーシティの恩恵をエネルギー材料の研究と自らの家庭に活かして—研究者ローモデル集　　　　　　　　　　　　　　　
池田輝之, 単著
茨城大学ダイバーシティ推進室, 2018年12月

熱電変換技術の基礎と応用　　　　　　　　　　　　　　　
池田 輝之, 共著
シーエムシー出版, 2011年11月

熱電変換技術の基礎と応用―クリーンなエネルギー社会をめざして― (編 舟橋良次他)　　　　　　　　　　　　　　　
池田輝之, 共著
シーエムシー出版, 2011年11月
9784781304809

熱電変換技術ハンドブック (監修 梶川武信)　　　　　　　　　　　　　　　
池田輝之,ジェフリー・スナイダー, 共著
エヌ・ティー・エス, 2008年12月
9784860432577

Handbook of thermoelectric technology　　　　　　　　　　　　　　　
NTS, 2008年
9784860432577

マルチプル拡散法による熱電材料研究の加速～新規熱電材料の探索および金属電極材料の選定～　　　　　　　　　　　　　　　
伏見 渉; 尾曽竜之介; 趙至洋; 池田輝之
第 21回日本熱電学会学術講演会 (TSJ2024), 2024年09月25日

熱電材料Al2Fe3Si3 と金属電極の接合と界面の性質　　　　　　　　　　　　　　　
物江海音; 金子笙; 岩本知広; 池田輝之
第 21回日本熱電学会学術講演会 (TSJ2024), 2024年09月25日

拡散対を用いたτ1-Al2Fe3Si3 熱電変換材料へのドーピング効果 の効率的測定　　　　　　　　　　　　　　　
阿部龍清; 真家拓海; 鈴木優大; 池田輝之
第 21回日本熱電学会学術講演会 (TSJ2024), 2024年09月25日

マルチプ拡散法による4元系 Fe-Al-Si-X(X=Ca, Mg, Ti, Mn)における熱電材料の探索　　　　　　　　　　　　　　　
趙至洋; 尾曽竜之介; 池田輝之
第 21回日本熱電学会学術講演会 (TSJ2024), 2024年09月24日

浮遊帯溶融法による緩やかな組成傾斜試料の作製法　　　　　　　　　　　　　　　
百合嶋 隆太; 池田 亜矢子; 池田 輝之
日本金属学会2024年秋期講演大会, 2024年09月20日

超音波接合による FAST 材料と Al の接合界面微細組織観察　　　　　　　　　　　　　　　
金子 笙; 岩本 知広; 市川 海人; 池田 輝之; 物江 海音; 濱田 賢祐
日本金属学会2024年秋期講演大会, 2024年09月18日

焼結マルチプル拡散法を用いた4元系状態図決定法　　　　　　　　　　　　　　　
本田 卓生; 百合嶋 隆太; 池田 輝之
日本金属学会2024年秋期講演大会, 2024年09月18日

焼結マルチプル拡散法による状態図作成に必要な測定粒子数の調査　　　　　　　　　　　　　　　
西野 紗衣; 本田 卓生; 池田 輝之
日本金属学会2024年秋期講演大会, 2024年09月18日

熱電材料と端子材料の超音波接合　　　　　　　　　　　　　　　
金子笙; 岩本知広; 池田輝之; 物江海音; 濱田賢祐
日本金属学会2024年春期講演大会, 2024年03月12日

最適なFAST材料探索のための熱浸透率測定　　　　　　　　　　　　　　　
西場穂佳; 河野紗佳; 池田輝之; 西剛史; 太田弘道
日本金属学会2024年春期講演大会, 2024年03月12日

ブリッジマン法で作製した多孔質Siにおける移動速度と孔の生成形態の関係　　　　　　　　　　　　　　　
渡部善貴; 太田将悟; 池田輝之
日本金属学会2024年春期講演大会, 2024年03月12日

Al2Fe3Si3-FeSiナノコンポジット中のFeSi粒子の体積分率及びサイズと熱電特性の関係　　　　　　　　　　　　　　　
趙至洋; 池田輝之
日本金属学会2024年春期講演大会, 2024年03月12日

Al2Fe3Si3熱電材料の開発　　　　　　　　　　　　　　　
池田輝之
第52回結晶成長国内会議, 2023年12月04日, 日本結晶成長学会, ［招待有り］
20231204, 20231206

High-throughput exploration of multicomponent material systems using composition graded materials　　　　　　　　　　　　　　　
Teruyuki Ikeda; Ryuta Yurishima; Ayako Ikeda
The 6th Symposium on International Joint Graduate Program in Materials Science and Spintronics, 2023年11月30日, ［招待有り］
20231128, 20231201

Determination of the existence composition range of CrMnFeCoNi high-entropy alloys using multiple diffusion method　　　　　　　　　　　　　　　
Ryuta YURISHIMA; Ayako IKEDA; Teruyuki IKEDA
PRICM11 (The 11th Pacific Rim International Conference on Advanced Materials and Processing), 2023年11月21日
20231119, 20231123

High-throughput phase diagram examinations on multicomponent systems using sintered diffusion multiples　　　　　　　　　　　　　　　
Teruyuki Ikeda; Ryuta Yurishima; Ayako Ikeda
PRICM11 (The 11th Pacific Rim International Conference on Advanced Materials and Processing), 2023年11月20日
20231119, 20231123

High-throughput search for high-performance materials using composition-graded bulk specimens　　　　　　　　　　　　　　　
R. Yurishima; A. Ikeda; T. Ikeda
NIMS Arard Symposium, 2023年11月07日
20231106, 20231107

τ1-Al2Fe3Si3の一方向凝固と熱電特性　　　　　　　　　　　　　　　
河野 紗佳,西場 穂佳,工藤 直人,西 剛史,池田 輝之
第 20 回日本熱電学会学術講演会, 2023年09月25日, 日本熱電学会
20230925, 20230927

Al2Fe3Si3のナノ構造化および熱電性能　　　　　　　　　　　　　　　
チョウ シヨウ,池田 輝之
第 20 回日本熱電学会学術講演会, 2023年09月25日, 日本熱電学会
20230925, 20230927

ブリッジマン法による多孔質Siの作製　　　　　　　　　　　　　　　
太田 将悟、渡部 善貴、池田 輝之
日本金属学会2023年秋期講演大会, 2023年09月19日, 日本金属学会
20230919, 20230922

τ₁-Al₂Fe₃Si₃熱電変換材料への環境親和性元素のドーピング　　　　　　　　　　　　　　　
真家 拓海、岡野 利哉、阿部 龍清、池田 輝之
日本金属学会2023年秋期講演大会, 2023年09月19日, 日本金属学会
20230919, 20230922

マルチプル拡散法による4,5 元系Fe-Al-Si-X1-X2 における熱電材料の探索　　　　　　　　　　　　　　　
尾曽竜之介、中山成哉、趙至洋、池田輝之、池田亜矢子、高際良樹
日本金属学会2023年春期講演大会, 2023年03月09日, 日本金属学会
20230307, 20230310

ナノコンポジット構造化Al2Fe3Si3-FeSiの作製と熱電特性　　　　　　　　　　　　　　　
趙至洋,池田輝之,高際良樹
日本金属学会2023年春期講演大会, 2023年03月07日, 日本金属学会
20230307, 20230310

CrMnFeCoNiハイエントロピー合金の存在組成範囲の網羅的把握　　　　　　　　　　　　　　　
百合嶋隆太、本田卓生、趙至洋、池田亜矢子、 池田輝之
日本金属学会2023年春期講演大会, 2023年03月07日, 日本金属学会
20230307, 20230310

環境調和型熱電材料Al2Fe3Si3のナノ構造化と熱物性への影響　　　　　　　　　　　　　　　
趙至洋,池田輝之
日本鉄鋼協会 評価・分析・解析部会 高温における最適な材料プロセス制御を目指した材料特性評価フォーラム シンポジウム「材料プロセス制御に向けた熱物性評価および今後の課題」, 2023年02月09日, 日本鉄鋼協会
20230209, 20230209

多元素組成空間における材料探索—環境調和型熱電材料の開発に向けて　　　　　　　　　　　　　　　
池田輝之
東北大学金属材料研究所先端エネルギー材料理工共創研究センター2022年度ワークショップ, 2022年12月22日, 東北大学金属材料研究所, ［招待有り］
20221222, 20221222

High throughput search for novel compounds in multi elementary spaces　　　　　　　　　　　　　　　
R. Yurishima; A. Ikeda; T. Ikeda
The 7th International Symposium of Quantum Beam Science, 2022年12月03日

Low temperature synthesis of thermoelectric β-FeSi2 via reactive sinterin　　　　　　　　　　　　　　　
S. Sumi; T. Ikeda; Y. Takagiwa
The 7th International Symposium of Quantum Beam Science, 2022年12月03日

マルチプル拡散法による状態図解析と妥当性評価　　　　　　　　　　　　　　　
中山 成哉、青木 優太、百合嶋 隆太、池田 亜矢子、池田 輝之
日本金属学会2022年秋期講演大会, 2022年09月22日, 日本金属学会
20220920, 20220923

温度傾斜熱処理による効率的な状態図調査　　　　　　　　　　　　　　　
百合嶋 隆太、池田 亜矢子、池田 輝之、高際 良樹
日本金属学会2022年秋期講演大会, 2022年09月22日, 日本金属学会
20220920, 20220923

反応焼結法により作製したβ-FeSi2系熱電材料の特性評価　　　　　　　　　　　　　　　
角 俊輔、池田 輝之、高際 良樹
日本金属学会2022年秋期講演大会, 2022年09月21日, 日本金属学会
20220920, 20220923

マルチプル拡散法による状態図決定における諸問題と解決法　　　　　　　　　　　　　　　
山川 海斗、西野 紗衣、尾曽 竜之介、池田 亜矢子、池田 輝之
日本金属学会2022年秋期講演大会, 2022年09月20日, 日本金属学会
20220920, 20220923

マルチプル拡散法による4,5元系Fe-Al-Si-X 1-X2における熱電材料の探索　　　　　　　　　　　　　　　
尾曽 竜之介、中山 成哉、池田 輝之、池田 亜矢子、高際 良樹
日本金属学会2022年秋期講演大会, 2022年09月20日, 日本金属学会
20220920, 20220923

焼結マルチプル拡散法によるAl-Fe-Si系熱電材料の探索　　　　　　　　　　　　　　　
中山 成哉、百合嶋 隆太、池田 亜矢子、池田 輝之
日本金属学会2022年春期講演大会, 2022年03月22日

マルチプル拡散法によるCrMnFeCoNi合金の部分系調査　　　　　　　　　　　　　　　
尾曽 竜之介、百合嶋 隆太、池田 輝之、池田 亜矢子
日本金属学会2022年春期講演大会, 2022年03月22日

マルチプル拡散による Mg2Si-Mg2Ge-Mg2Sn擬三元系状態図の作成　　　　　　　　　　　　　　　
山川 海斗、池田 輝之、池田 亜矢子
日本金属学会2022年春期講演大会, 2022年03月22日

マルチプル拡散による高効率な相境界組成の決定　　　　　　　　　　　　　　　
百合嶋 隆太、池田 亜矢子、池田 輝之
日本金属学会2022年春期講演大会, 2022年03月17日

反応焼結法による β-FeSi2熱電材料の単相作製　　　　　　　　　　　　　　　
角 俊輔、池田 輝之、高際 良樹
日本金属学会2022年春期講演大会, 2022年03月15日

Examination of partial systems of CrMnFeCoNi alloys by multiple diffusion method　　　　　　　　　　　　　　　
R. Yurishima; A. Ikeda; T. Ikeda
The 6th International Symposium of Quantum Beam Science, 2022年02月21日

新規熱電材料探索に向けたハイスループットなアプローチ　　　　　　　　　　　　　　　
池田輝之
日本鉄鋼協会 評価・分析・解析部会, 2021年12月22日

マルチプル拡散法によるCrMnFeCoNi系合金の部分系調査　　　　　　　　　　　　　　　
百合嶋 隆太、池田 輝之、池田 亜矢子
日本金属学会2021年秋期講演大会, 2021年09月15日

β-FeSi2熱電材料の合成に向けた反応焼結法の条件探索　　　　　　　　　　　　　　　
角 俊輔、池田 輝之
日本金属学会2021年秋期講演大会, 2021年09月14日

Fe-Al-Si 熱電材料および発電モジュールの研究開発　　　　　　　　　　　　　　　
高際 良樹,池田 輝之,小島 宏康
応用物理学会秋季学術講演会, 2021年09月10日

実験・計算科学・機械学習を用いたFe-Al-Si熱電材料(FAST材)の研究　　　　　　　　　　　　　　　
高際 良樹; Zhufeng Hou; 津田 宏治; 池田 輝之; 小島 宏康
日本熱電学会学術講演会, 2021年08月23日

多孔質Siを用いた流体透過型熱電変換デバイスの作製とその特性評価　　　　　　　　　　　　　　　
あべ松雄太朗、永野隆敏、池田輝之
日本熱電学会学術講演, 2021年08月23日

Fabrication of Fluid-permeable Thermoelectric Conversion Devices Using Porous Si　　　　　　　　　　　　　　　
Yutaro Abematsu; Yasutaka Hashimoto; Yohei Hiyama; Takatoshi Nagano; Teruyuki Ikeda
Virtual Conference on Thermoelectrics (VCT 2021), 2021年07月20日

Fabrication of β-FeSi2 with low energy consumption via ball milling process　　　　　　　　　　　　　　　
Shunsuke Sumi; Teruyuki Ikeda
Virtual Conference on Thermoelectrics (VCT 2021), 2021年07月20日

マルチプル拡散法におけるAl-Fe-Si系熱電材料の状態図決定　　　　　　　　　　　　　　　
中山 成哉、青木 優太、松井 裕貴、池田 亜矢子、池田 輝之
日本金属学会2021年春期講演大会, 2021年03月17日

多孔質Siを用いた流体透過型熱電変換デバイスの作製とその特性　　　　　　　　　　　　　　　
あべ松 雄太朗、橋本 康孝、日山 洋平、永野 隆敏、池田 輝之
日本金属学会2021年春期講演大会, 2021年03月16日

焼結マルチプル拡散法を利用した多元系状態図の決定法　　　　　　　　　　　　　　　
山川 海斗、青木 優太、池田 亜矢子、池田 輝之
日本金属学会2021年春期講演大会, 2021年03月16日

熱電材料の高性能化に向けて―ハイスループット測定によるアプローチ　　　　　　　　　　　　　　　
池田輝之
日本金属学会九州支部および日本鉄鋼協会九州支部 2021年度 春季講演会, 2021年03月09日, ［招待有り］

多孔質熱電材料を用いた新しい熱流体透過型熱電変換デバイスの提案　　　　　　　　　　　　　　　
池田輝之
マイクロ接合研究委員会, 2021年03月05日, 溶接学会, ［招待有り］
20210305, 20210305

低消費エネルギー化のためのFeSi2熱電材料のボールミルプロセスの検討　　　　　　　　　　　　　　　
角 俊輔、山本 悠眞、Babak Alinejad、池田 輝之
日本金属学会2021年春期講演大会, 2021年03月

A new environmentally friendly Al-Fe-Si thermoelectric material and its thermoelectric properties"　　　　　　　　　　　　　　　
A new environmentally friendly Al-Fe-Si thermoelectric material and its thermoelectric properties"
The 5th International Symposium of Quantum Beam Science, 2020年11月20日

Examination of the existing range of CrMnFeCoNi high entropy alloys using multiple diffusion method　　　　　　　　　　　　　　　
Ryuta Yurishima; Ayako Ikeda; Teruyuki Ikeda
The 5th International Symposium of Quantum Beam Science, 2020年11月20日

High-throughput survey of multicomponent material systems using compositiongraded materials　　　　　　　　　　　　　　　
Teruyuki Ikeda
The 5th International Symposium of Quantum Beam Science, 2020年11月20日, ［招待有り］

熱物性顕微鏡を用いたFe-Al-Si系拡散対の熱浸透率分布測定　　　　　　　　　　　　　　　
伊藤俊亮,西剛史,太田弘道,池田輝之,黒江怜史,松井裕貴,羽鳥仁人,大槻哲也
第41回熱物性シンポジウム, 2020年10月
20201028, 20201030

連続鋳造法によるポーラス熱電材料の作製　　　　　　　　　　　　　　　
日山洋平,橋本康孝,池田輝之
日本熱電学会学術講演会, 2020年09月29日

多孔質Si を用いた高熱伝達型熱電変換デバイスの作製　　　　　　　　　　　　　　　
橋本康孝,佐々木誠,日山洋平,棈松雄太朗,永野隆敏,池田輝之
日本熱電学会学術講演会, 2020年09月29日

ボールミリング法を用いたAl-Fe-Si系熱電材料の作製と特性評価　　　　　　　　　　　　　　　
山本悠眞, Babak Alinejad,池; 田輝之,高際良樹
日本熱電学会学術講演会, 2020年09月29日

マルチプ拡散法によるマルチプ拡散法による多元状態図におけるタイライン決定法の確立　　　　　　　　　　　　　　　
青木優太; 松井裕貴; 池田亜矢子,池田輝之
日本金属学会2020年秋期講演大会, 2020年09月17日

多元系合金の簡便な状態図決定法　　　　　　　　　　　　　　　
池田輝之、百合嶋隆太、青木優太、松井裕貴、池田亜矢子
日本金属学会2020年秋期講演大会, 2020年09月17日, ［招待有り］

Al2Fe3Si3の存在組成範囲の存在組成範囲と熱電特性の組成依存性　　　　　　　　　　　　　　　
松井裕貴、西峯広智、山本悠真、池田亜矢子、高際良樹、池田輝之
日本金属学会2020年秋期講演大会, 2020年09月15日

マルチプル拡散法によるCrMnFeCoNi 系合⾦の相境界の調査　　　　　　　　　　　　　　　
百合嶋隆太、池⽥輝之,池⽥亜⽮⼦
日本金属学会2020年秋期講演大会, 2020年09月15日

Existing composition range of the Al2Fe3Si3 phase and its composition,dependent thermoelectric properties　　　　　　　　　　　　　　　
Hiroki Matsui; Hirotoshi Nishimine; Yuta Aoki; Ayako Ikeda; Yoshiki Takagiwa; Teruyuki Ikeda
Virtual Conference on Thermoelectrics (VCT 2020), 2020年07月21日

Development of multiple diffusion method to facilitate phase diagram,investigations　　　　　　　　　　　　　　　
Yuta Aoki; Ryuta Yurishima; Ayako Ikeda; Teruyuki Ikeda
Virtual Conference on Thermoelectrics (VCT 2020), 2020年07月21日

Fabrication of lotus-type porous thermoelectric materials by continuous,casting method　　　　　　　　　　　　　　　
Yohei Hiyama; Yasutaka Hashimoto; Teruyuki Ikeda
Virtual Conference on Thermoelectrics (VCT 2020), 2020年07月21日

Reactive consolidation of Al-Fe-Si powder activated via ball-milling　　　　　　　　　　　　　　　
Yuma Yamamoto; Babak Alinejad; Teruyuki Ikeda; Yoshiki Takagiwa
Virtual Conference on Thermoelectrics (VCT 2020), 2020年07月21日

Fabrication of thermoelectric conversion devices using porous Si with enhanced heat transfer capabilities　　　　　　　　　　　　　　　
Yasutaka Hashimoto; Makoto Sasaki; Yohei Hiyama; Takatoshi Nagano; Teruyuki Ikeda
Virtual Conference on Thermoelectrics (VCT 2020), 2020年07月21日

マルチプル拡散法の確立とAl-Fe-Si系状態図の作成　　　　　　　　　　　　　　　
青木優太、松井裕貴、池田亜矢子、池田 輝之
日本金属学会2020年春期講演大会, 2020年03月19日

粒子法シミュレーションにより評価した流体透過性多孔質熱電材料の熱伝達係数の形状パラメータ依存性　　　　　　　　　　　　　　　
佐々木 誠、橋本 康孝、永野 隆敏、池田 輝之
日本金属学会2020年春期講演大会, 2020年03月18日

ボールミル法を用いたAl-Fe-Si系熱電材料の合成とその特性評価　　　　　　　　　　　　　　　
山本 悠眞、Alinejad Babak、池田 輝之、高際 良樹
日本金属学会2020年春期講演大会, 2020年03月18日

連続鋳造法によるロータス型ポーラスシリコンの作製　　　　　　　　　　　　　　　
日山 洋平、橋本 康孝、池田 輝之
日本金属学会2020年春期講演大会, 2020年03月17日

マルチプル拡散法によるCrMnFeCoNi系HEAsの存在組成範囲調査　　　　　　　　　　　　　　　
百合嶋 隆太、池田輝之、池田 亜矢子
日本金属学会2020年春期講演大会, 2020年03月17日

Al2Fe3Si3相の存在組成範囲の決定　　　　　　　　　　　　　　　
松井裕貴、青木優太、池田亜矢子、池田 輝之
日本金属学会2020年春期講演大会, 2020年03月17日

多孔質Siを用いた熱電変換デバイスの作製条件検討　　　　　　　　　　　　　　　
橋本 康孝、佐々木 誠、日山 洋平、永野 隆敏、池田 輝之
日本金属学会2020年春期講演大会, 2020年03月17日

A high-throughput approach to thermoelectric materials with enhanced properties in complex material systems　　　　　　　　　　　　　　　
Teruyuki IKEDA
Materials Researchmeeting 2019 (MRM2019), 2019年12月13日, ［招待有り］

Activated reactive consolidation as a new approach to fabricate highly pure intermetallic thermoelectric materials　　　　　　　　　　　　　　　
Babak ALINEJAD; Yuma YAMAMOTO; Teruyuki IKEDA
Materials Researchmeeting 2019 (MRM2019), 2019年12月13日

Examination of Fabrication Condition of Thermoelectric Conversion Devices Using Porous Thermoelectric Materials　　　　　　　　　　　　　　　
Yasutaka HASHIMOTO; Makoto SASAKI; Yohei HIYAMA; Takatoshi NAGANO; Teruyuki IKEDA
Materials Researchmeeting 2019 (MRM2019), 2019年12月11日

Fabrication of porous thermoelectric materials and their applications　　　　　　　　　　　　　　　
Yasutaka Hashimoto; Makoto Sasaki; Yohei Hiyama; Takatoshi Nagano; Teruyuki Ikeda
The 4th International Symposium of Quantum Beam Science, 2019年11月01日, Institute of Quantum Beam Science at Ibaraki University

Examination of phase diagrams of high entropy alloys using multiple diffusion method　　　　　　　　　　　　　　　
Ryuta Yurishima; Teruyuki Ikeda
The 4th International Symposium of Quantum Beam Science, 2019年10月31日, Institute of Quantum Beam Science at Ibaraki University

Fabrication of a single phase τ1-Al2Fe3Si3 thermoelectric material via unidirectional solidification　　　　　　　　　　　　　　　
Hirotoshi Nishimine; Akiko Saitoh; Teruyuki Ikeda; Yoshiki Takagiwa
The 4th International Symposium of Quantum Beam Science, 2019年10月31日, Institute of Quantum Beam Science at Ibaraki University

Evaluation of heat transfer coefficient of fluid-transmissive porous thermoelectric material by particle method simulation　　　　　　　　　　　　　　　
Makoto Sasaki; Teruyuki Ikeda
The 4th International Symposium of Quantum Beam Science, 2019年10月31日, Institute of Quantum Beam Science at Ibaraki University

Influence of solidification rate on pore formation in lotus silicon　　　　　　　　　　　　　　　
Yohei Hiyama; Yasutaka Hashimoto; Teruyuki Ikeda
The 4th International Symposium of Quantum Beam Science, 2019年10月31日, Institute of Quantum Beam Science at Ibaraki University

Examination of the phase diagram of the Al-Fe-Si system using multiple diffusion method　　　　　　　　　　　　　　　
Yuta Aoki; Hiroki Matsui; Ayako Ikeda; Teruyuki Ikeda
The 4th International Symposium of Quantum Beam Science, 2019年10月31日, Institute of Quantum Beam Science at Ibaraki University

Reactive Consolidation of Al-Fe-Si Powder Activated via Ball-milling　　　　　　　　　　　　　　　
Yuma Yamamoto; Babak Alinejad; Yoshiki Takagiwa; Teruyuki Ikeda
The 4th International Symposium of Quantum Beam Science, 2019年10月31日, Institute of Quantum Beam Science at Ibaraki University

Solid state modification via activated reactive consolidation for fabrication of intermetallic thermoelectric materials　　　　　　　　　　　　　　　
Babak Alinejad; Yuma Yamamoto; Yoshiki Takagiwa; Teruyuki Ikeda
The 4th International Symposium of Quantum Beam Science, 2019年10月31日, Institute of Quantum Beam Science at Ibaraki University

多孔質Siを用いた熱電変換デバイス作製に向けて　　　　　　　　　　　　　　　
橋本康孝,佐々木誠,日山洋平,永野隆敏,池田輝之
日本金属学会2019年秋期講演大会, 2019年09月13日

Al-Fe-Si粉末の短時間低温焼結とその特性評価　　　　　　　　　　　　　　　
山本悠眞,Alinejad Babak,池田輝之,高際良樹
日本金属学会2019年秋期講演大会, 2019年09月13日

粒子法シミュレーションによる熱流体透過型多孔質熱電材料の熱伝達係数の精度評価　　　　　　　　　　　　　　　
佐々木誠,橋本康孝,永野 隆敏,池田輝之
日本金属学会2019年秋期講演大会, 2019年09月13日

Al-Fe-Si系材料におけるマルチプル拡散法の有効性と状態図の作成　　　　　　　　　　　　　　　
青木優太,松井裕貴,池田亜矢子,池田輝之
日本金属学会2019年秋期講演大会, 2019年09月13日

熱物性顕微鏡を用いたPbTe-Sb2Te3系化合物の熱浸透率分布測定　　　　　　　　　　　　　　　
伊藤俊亮,太田弘道,池田輝之,西剛史,真山知大,羽鳥仁人,粟野孝昭,大槻哲也
日本金属学会2019年秋期講演大会, 2019年09月11日

Al-Fe-Si系熱電材料の単相測定　　　　　　　　　　　　　　　
西峯広智,齊藤明子,池田輝之,高際良樹
日本金属学会2019年秋期講演大会, 2019年09月11日

多孔質シリコンの孔形成に及ぼす凝固速度の影響　　　　　　　　　　　　　　　
日山 洋平,池田 輝之
日本金属学会2019年秋期講演大会, 2019年09月11日

IoTセンサ用自立電源に向けたAl-Fe-Si系熱電材料の創製とモジュール開発　　　　　　　　　　　　　　　
高際良樹、池田輝之、小島宏康
日本熱電学会, 2019年09月02日

Microstructure tailoring of Al2Fe3Si3 for thermoelectric applications　　　　　　　　　　　　　　　
Babak Alinejad; Yuma Yamamoto; Yoshiki Takagiwa; Teruyuki Ikeda
日本熱電学会, 2019年09月02日

Recent TE projects at the Ibaraki University　　　　　　　　　　　　　　　
Teruyuki Ikeda
2019 North American Thermoelectric (Na-Te) Workshop, 2019年09月02日

Rapid solid state reaction synthesis of nanostructured Mg2Si via activated reactive mechanical milling at room temperature　　　　　　　　　　　　　　　
Babak Alinejad; Teruyuki Ikeda
The Fifth Asia-Pacific Conference on Semiconducting Silicides and Related Materials, 2019年07月20日

Towards enhanced thermoelectronic conversion-from a structural approach　　　　　　　　　　　　　　　
Teruyuki Ikeda
The Second Asian Workshop of Experiment and Theory in Quantum Beam Molecular Sciences, 2019年07月13日

Fabrication of porous thermoelectric materials with elongated pores and its applications　　　　　　　　　　　　　　　
Teruyuki Ikeda
The 38th International Conference on Thermoelectrics & The 4th Asian Conference on Thermoelectrics, 2019年07月02日, ［招待有り］

Towards fabrication of thermoelectric conversion devices using porous thermoelectric materials　　　　　　　　　　　　　　　
Yasutaka Hashimoto; Makoto Sasaki; Takatoshi Nagano; Teruyuki Ikeda
The 38th International Conference on Thermoelectrics & The 4th Asian Conference on Thermoelectrics, 2019年07月02日, ［招待有り］

流体透過性多孔質熱電材料を用いた新しい熱電変換モジュール　　　　　　　　　　　　　　　
池田輝之
JST新技術説明会, 2019年06月27日, ［招待有り］

Solid state reaction modification to enhance nanostructured Mg2Si thermoelectric properties via activated reactive consolidation　　　　　　　　　　　　　　　
Babak Alinejad,山本悠眞,高際良樹,池田輝之
日本金属学会2019年春期講演大会, 2019年03月21日

多孔質熱電変換材料を用いた熱電変換デバイスの作製条件の検討　　　　　　　　　　　　　　　
橋本康孝,佐々木誠,永野隆敏,池田輝之
日本金属学会2019年春期講演大会, 2019年03月21日

ボールミリングを用いたMg2Siの低温・短時間合成法の確立　　　　　　　　　　　　　　　
山本悠眞,Alinejad Babak,池田輝之
日本金属学会2019年春期講演大会, 2019年03月20日

Al-Fe-Si系平衡状態図におけるAl2Fe3Si3相の存在組成範囲の決定　　　　　　　　　　　　　　　
青木優太,齊藤明子,池田輝之,高際良樹
日本金属学会2019年春期講演大会, 2019年03月20日

ロータスアルミニウムにおけるポア成長のフェーズフィールドシミュレーション　　　　　　　　　　　　　　　
飯塚恒太,篠嶋妥,湯地隆介,遠藤基史,池田輝之
日本金属学会2019年春期講演大会, 2019年03月20日

高効率熱電変換材料の研究動向―材料中の構造に着目して　　　　　　　　　　　　　　　
池田輝之
平成30 年度物質科学研究会, 2018年12月14日, ［招待有り］

多孔質熱電材料を用いた熱電変換デバイス開発における基礎的検討　　　　　　　　　　　　　　　
橋本康孝,佐々木誠,山崎拓矢,池田輝之
日本熱電学会学術講演会, 2018年09月

粒子法シミュレーションによる熱流体透過型多孔質熱電材料の熱伝達係数評価　　　　　　　　　　　　　　　
佐々木誠,永野隆敏,池田輝之,井手拓哉,中嶋英雄
日本熱電学会学術講演会, 2018年09月

Low temperature rapid fabrication of Mg2Si via activated reactive consolidation　　　　　　　　　　　　　　　
Babak Alinejad; Teruyuki Ikeda
日本熱電学会学術講演会, 2018年09月

ブリッジマン法を用いた組成傾斜試料の作製と新規熱電材料の探索　　　　　　　　　　　　　　　
西峯 広智,池田 輝之
日本金属学会2018年秋期講演大会, 2018年09月

一方向に伸びた孔をもつ多孔質シリコンの熱電特性　　　　　　　　　　　　　　　
山崎拓矢,井手拓哉,池田輝之,中嶋英雄
日本金属学会2018年秋期講演大会, 2018年09月

Development of Low-cost and Non-toxic Thermoelectric Material for Sensor Application　　　　　　　　　　　　　　　
Yoshiki Takagiwa; Yukihiro Isoda; Masahiro Goto; Yoshikazu Shinohara; Akiko Saito; Teruyuki Ikeda
15TH INTERNATIONAL SYMPOSIUM ON FUNCTIONALLY GRADED MATERIALS, 2018年08月07日

An efficient way of exploring microstructure and thermoelectric properties of multicomponent systems using composition-graded bulk materials　　　　　　　　　　　　　　　
Akiko Saitoh; Hirotoshi Nishimine; Ayako Ikeda; Yoshiki Takagiwa; Tsuyoshi Nishi; Hiromichi Ohta; Teruyuki Ikeda
15TH INTERNATIONAL SYMPOSIUM ON FUNCTIONALLY GRADED MATERIALS, 2018年08月07日

Unidirectional solidification and multiple diffusion couple technique as tools to accelerate the study of thermoelectric materials　　　　　　　　　　　　　　　
Akiko Saitoh; Hirotoshi Nishimine; Ayako Ikeda; Teruyuki Ikeda
15TH INTERNATIONAL SYMPOSIUM ON FUNCTIONALLY GRADED MATERIALS, 2018年08月06日

Porous thermoelectric materials and their applications　　　　　　　　　　　　　　　
Teruyuki Ikeda; Takatoshi Nagano; Takuya Ide; Hideo Nakajima
The 35th International Conference & The 1st Asia Conference on Thermoelectrics, 2018年07月04日

Significant Enhancement of Thermoelectric Properties of Nanostructured Mg2Si via low temperature consolidation　　　　　　　　　　　　　　　
Alinejad Babak; Teruyuki Ikeda
The 35th International Conference & The 1st Asia Conference on Thermoelectrics, 2018年07月04日

フラックス法によるPbTe及びSiの一方向凝固　　　　　　　　　　　　　　　
青野美南; 斎藤明子; 池田輝之
日本金属学会2018年春期講演大会, 2018年03月

Si基熱電材料のキャリア濃度増大と耐用条件　　　　　　　　　　　　　　　
菅原龍太郎; 渡部紘介; 池田輝之
日本金属学会2018年春期講演大会, 2018年03月

一方向凝固を利用した熱電材料の組織探索　　　　　　　　　　　　　　　
齊藤明子; 西峯広智; 池田亜矢子; 池田輝之; 高際良樹
日本金属学会2018年春期講演大会, 2018年03月

粒子法シミュレーションによる熱流体透過型多孔質熱電材料の温度分布評価　　　　　　　　　　　　　　　
佐々木誠; Shiva Kumar Singh; 永野隆敏; 池田輝之; 井手拓哉; 中嶋英雄
日本金属学会2018年春期講演大会, 2018年03月

High-thermoelectric performance of nanostructured doped Mg2Si　　　　　　　　　　　　　　　
Babak Alinejad; Teruyuki Ikeda
日本金属学会2018年春期講演大会, 2018年03月

Low temperature rapid fabrication of Mg2Si via activated reactive consolidation　　　　　　　　　　　　　　　
Babak Alinejad and Teruyuki Ikeda
TMS 2018 147rd Annual Meeting & Exhibition, 2018年03月, ［招待有り］

Microstructure control of bulk thermoelectric materials via phase transformations　　　　　　　　　　　　　　　
Teruyuki Ikeda
SPARCA 2018 (2018 SYMPOSIUM FOR THE PROMOTION OF APPLIED RESEARCH COLLABORATION IN ASIA), 2018年02月12日, ［招待有り］

ロータスアルミニウム金属におけるポア成長のフェーズフィールドシミュレーション　　　　　　　　　　　　　　　
リュウビン、池田輝之、篠嶋 妥
日本軽金属学会, 2017年11月

熱物性顕微鏡を用いた鉄基合金系熱電変換材料の熱浸透率測定　　　　　　　　　　　　　　　
大川萌里; 西剛史; 池田輝之; 太田弘道; 羽鳥仁人
熱物性シンポジウム, 2017年11月

Microstructure tailoring of silicon-aluminum oxide nano-composite for thermoelectric applications　　　　　　　　　　　　　　　
Babak Alinejad; Teruyuki Ikeda
日本金属学会秋期講演大会, 2017年09月08日

低次元ナノ構造をもつバルク熱電材料の創製　　　　　　　　　　　　　　　
井野﨑崇; Babak Alinejad; 池田輝之
日本熱電学会, 2017年09月

一方向に孔の揃った多孔質シリコンの作製と熱電特性　　　　　　　　　　　　　　　
山崎拓矢、児島孝文、井手拓哉、池田輝之、中嶋英雄
日本熱電学会, 2017年09月

パルス通電焼結法による高密度Si焼結体の作製　　　　　　　　　　　　　　　
渡辺英和、池田輝之
日本熱電学会, 2017年09月

Si-Sb熱電材料のナノ構造化とキャリア濃度および熱伝導率の関係　　　　　　　　　　　　　　　
菅原龍太郎,渡部紘介,池田輝之
日本熱電学会, 2017年09月

新規熱電材料の開発における一方向凝固法の有効性　　　　　　　　　　　　　　　
齊藤明子,青野美南,西峯広智,池田輝之,高際良樹,長谷川靖洋
日本熱電学会, 2017年09月

Fabrication of highly pure, dense Mg2Si via single-step low temperature,reactive consolidation　　　　　　　　　　　　　　　
B.Alinejad; T. Ikeda
IUMRS-ICAM 2017, 2017年08月31日

Nanostructuring and its effects on thermoelectric properties of Si base,composites　　　　　　　　　　　　　　　
T. Ikeda; K. Watanobe; Y. Hong
IUMRS-ICAM 2017, 2017年08月31日, ［招待有り］

Macroscale thermoelectric materials with low dimensional nanoscale features　　　　　　　　　　　　　　　
T.Ikeda
The 36th International Conference on Thermoelectrics, 2017年07月31日

Single-step low temperature solid state reaction for synthesis of high purity dense Mg2Si　　　　　　　　　　　　　　　
Babak Alinejad; Teruyuki Ikeda
日本金属学会春期講演大会, 2017年03月17日

Mechanical alloying of the silicon-boron system　　　　　　　　　　　　　　　
叶洪,池田輝之
日本金属学会春期講演大会, 2017年03月15日

Microstructural size and morphology control of Si base thermoelectric composites　　　　　　　　　　　　　　　
T. Ikeda
TMS 2017 146rd Annual Meeting & Exhibition, 2017年02月28日, ［招待有り］

Nanostructuring of Mg₂Si and its thermoelectric properties　　　　　　　　　　　　　　　
T. Adachi; T. Ikeda; G. Jeffrey Snyder
The 1st International Symposium of Quantum Beam Science, 2016年11月19日

Nanostructuring of Mg₂Si and its thermoelectric properties　　　　　　　　　　　　　　　
T. Adachi; T. Ikeda; G. Jeffrey Snyder
The 1st International Symposium of Quantum Beam Science, 2016年11月19日

Life of a Japanese scientist in Pasadena, California　　　　　　　　　　　　　　　
Teruyuki Ikeda
カリフォルニア大学リバーサイド校との部局間協定に伴う国際セミナー, 2016年11月16日

応力下におけるMg2Si合金のSi析出相の成長過程のシミュレーション　　　　　　　　　　　　　　　
劉濱,篠嶋妥,池田輝之
軽金属学会第131回秋期大会, 2016年11月

一方向に伸びた孔をもつ熱電材料の創製　　　　　　　　　　　　　　　
児島孝文; 池田輝之; 中嶋英雄; 井手拓哉; 川口裕美
第13 回 ヤングメタラジスト研究交流会, 2016年10月21日

粉体焼結における高密度Si焼結体の作製とナノ構造化　　　　　　　　　　　　　　　
渡辺英和,池田輝之
第13 回 ヤングメタラジスト研究交流会, 2016年10月21日

ギブズートムソン効果によるバルクシリコンの固溶度の変化　　　　　　　　　　　　　　　
渡部紘介,池田輝之
第13 回 ヤングメタラジスト研究交流会, 2016年10月21日

組織制御熱電材料の現状とこれから　　　　　　　　　　　　　　　
応用物理学会秋季学術講演会, 2016年09月16日, ［招待有り］

一方向に伸びた孔をもつ熱電材料の創製と新しい熱電発電デバイスの可能性　　　　　　　　　　　　　　　
児島孝文,山崎拓矢,池田輝之; 中嶋英雄; 井手拓哉; 川口裕美
日本熱電学会, 2016年09月

Low dimensional approach to improved thermoelectric performance via powder metallurgy and crystal growth method　　　　　　　　　　　　　　　
Babak Alinejad; Takashi Inozaki; Akiko Saitoh; Teruyuki Ikeda
日本熱電学会, 2016年09月

Boron (phosphorus) doping of silicon by high-energy ball milling　　　　　　　　　　　　　　　
Hong Ye; Teruyuki Ikeda
日本熱電学会, 2016年09月

バルクシリコンのナノ構造化とドーパント固溶度　　　　　　　　　　　　　　　
渡部紘介,池田輝之
日本熱電学会, 2016年09月

シリコン熱電材料の焼結性及びナノ構造制御　　　　　　　　　　　　　　　
渡辺 英和,池田輝之
日本金属学会秋期講演大会, 2016年09月

Fabrication of silicon-alumina nano-composite via ball milling-SPS method for thermoelectric applications　　　　　　　　　　　　　　　
Babak ALINEJAD; Teruyuki IKEDA
日本金属学会秋期講演大会, 2016年09月

熱物性顕微鏡を用いたPb30Sb10Ag10Te50熱電材料の局所熱浸透率測定　　　　　　　　　　　　　　　
西 剛史; 池田 輝之; 太田 弘道; 山本 俊; 大川 萌里; 羽鳥 仁人
日本金属学会秋期講演大会, 2016年09月

Mg2Si合金におけるSi析出相の成長過程に及ぼす外部応力の影響　　　　　　　　　　　　　　　
リュウ・ビン,池田輝之 篠嶋妥
軽金属学会関東支部総会・講演会, 2016年08月29日

燃焼ガス透過性多孔質熱電材料を用いた新しい熱発電　　　　　　　　　　　　　　　
池田輝之
都市ガスシンポジウム 2016, 2016年06月01日

Nanostructuring thermoelectric materials and its functions in various aspects　　　　　　　　　　　　　　　
Kosuke Watanobe; Ye Hong; Tetsuya Adachi; Takashi Inozaki; Yasuharu Saruta; Naotoshi Uchida; Teruyuki Ikeda
The 35th International Conference & The 1st Asia Conference on Thermoelectrics, 2016年05月29日

Fabrication of porous thermoelectric materials with unidirectionally elongated pores　　　　　　　　　　　　　　　
Teruyuki Ikeda; Takafumi Kojima; Hiromi Kawaguchi; Takuya Ide; Hideo Nakajima
The 35th International Conference & The 1st Asia Conference on Thermoelectrics, 2016年05月29日

マルチ拡散対法による効率的な多元系状態図の作成　　　　　　　　　　　　　　　
池田亜矢子,池田輝之
2016年日本金属学会春期講演大会, 2016年03月

高エネルギーボールミルによるシリコンおよびシリサイド熱電材料のナノ構造化と制御　　　　　　　　　　　　　　　
安達哲也,叶洪,渡部紘介,井野崎崇,池田輝之
2016年日本金属学会春期講演大会, 2016年03月

Mg2Si合金におけるSi析出相の成長過程のPhase-Field シミュレーション　　　　　　　　　　　　　　　
劉濱,池田輝之,篠嶋妥
2016年日本金属学会春期講演大会, 2016年03月

熱電材料のナノ構造化とドーパント固溶限　　　　　　　　　　　　　　　
渡部紘介,池田輝之
2016年日本金属学会春期講演大会, 2016年03月

一方向に伸びた孔をもつ多孔質SiおよびMg2Siの創製　　　　　　　　　　　　　　　
児島孝文,池田輝之,井手拓哉,川口裕美,中嶋英雄
2016年日本金属学会春期講演大会, 2016年03月

Nanostructuring silicon base materials and its impacts on the thermoelectric properties　　　　　　　　　　　　　　　
Teruyuki IKeda
TMS 2016 145rd Annual Meeting & Exhibition, 2016年02月15日, ［招待有り］

Phase field simulation of precipitation process of Si in Mg2Si　　　　　　　　　　　　　　　
Bin LIU; Yasushi SASAJIMA; Teruyuki IKEDA
25th Annual Meeting of MRS-J, 2015年12月

熱物性顕微鏡によるコンビナトリアル熱電変換材料の熱浸透率測定　　　　　　　　　　　　　　　
山本俊,大川萌里,西剛史,池田輝之,太田弘道,羽鳥仁人
第36回日本熱物性シンポジウム, 2015年10月

一方向に伸びた孔をもつ多孔質熱電材料の創製　　　　　　　　　　　　　　　
児島孝文,池田輝之,川口裕美,井手拓哉,中嶋英雄
日本金属学会秋期講演大会, 2015年09月

一方向凝固組成傾斜試料を利用した熱電材料のハイスループットな研究法　　　　　　　　　　　　　　　
鈴木利弥,池田輝之
日本金属学会秋期講演大会, 2015年09月

バルクシリコンのナノ構造化と溶解度　　　　　　　　　　　　　　　
渡部紘介,池田輝之
日本金属学会秋期講演大会, 2015年09月

一方向に孔の揃った多孔質熱電材料の創製　　　　　　　　　　　　　　　
池田輝之,児島孝文,川口裕美,井手拓哉,中嶋英雄
第12回日本熱電学会学術講演会, 2015年09月

熱電材料研究の現状とこれから　　　　　　　　　　　　　　　
池田輝之
資源･素材学会東北支部 平成27年度春季大会, 2015年06月17日, 資源･素材学会東北支部, ［招待有り］

燃焼ガス透過性多孔質熱電材料を用いた新しい熱発電　　　　　　　　　　　　　　　
池田輝之
都市ガスシンポジウム 2015, 2015年06月10日

Control and stability of nanostructures of thermoelectric materials　　　　　　　　　　　　　　　
Teruyuki Ikeda
TMS 2015 144th Annual Meeting & Exhibition, 2015年03月18日, The Minerals, Metals and Materials Society, ［招待有り］

熱電変換技術のこれからー廃熱再生に向けて　　　　　　　　　　　　　　　
池田輝之
静岡大学工学部講演会, 2014年12月24日, ［招待有り］

Ag2Se-Cu2Se 擬二元系状態図と組織制御　　　　　　　　　　　　　　　
堀井真理,池田輝之
日本熱電学会, 2014年09月

PbTe基化合物のナノ構造化と格子熱伝導率　　　　　　　　　　　　　　　
田丸祐也 池田輝之
日本熱電学会, 2014年09月

一方向凝固を利用したバルク機能材料のハイスループットな研究法　　　　　　　　　　　　　　　
鈴木利弥,池田輝之
日本熱電学会, 2014年09月

熱電変換技術のこれから —廃熱再生のため　　　　　　　　　　　　　　　
池田輝之
茨城大学工学部先端科学トピックス, 2014年05月29日

Nanostructured Thermoelectric Materials via a High-energy Nonequilibrium State　　　　　　　　　　　　　　　
The 9th Workshop on Reactive Metal Processing, 2014年02月21日

Nanostructuring of thermoelectric materials via a nonequilibrium intermediate state　　　　　　　　　　　　　　　
T. Ikeda; G.J. Snyder
TMS 2014 143rd Annual Meeting & Exhibition, 2014年02月20日, The Minerals, Metals and Materials Society, ［招待有り］

非平衡プロセスを利用した熱電材料 Mg2Si のナノ構造化　　　　　　　　　　　　　　　
池田輝之
日本熱電学会, 2013年09月09日, 日本熱電学会

Unidirectional solidification of thermoelectric materials —a tool to accelerate the researc　　　　　　　　　　　　　　　
T. Ikeda; N.A. Heinz; G.J. Snyder
The 32nd International & 10th European Conference on Thermoelectrics, 2013年07月01日, The International Thermoelectric Society

Size Control and Alignment of the Microstructure in the Bi2Te3-In2Te3 System　　　　　　　　　　　　　　　
N.A. Heinz; T. Ikeda; G.J. Snyder
TMS 2013 142nd Annual Meeting & Exhibition, 2013年03月03日, The Minerals, Metals and Materials Society

Unidirectional solidification as a tool to accelerate the study of thermoelectric materials　　　　　　　　　　　　　　　
T. Ikeda; N.A. Heinz; G.J. Snyder
The 31st International & 10th European Conference on Thermoelectrics, 2012年07月09日, The International Thermoelectric Society

Nanostructuring of Thermoelectric Materials via a Nonequilibrium Intermediate State　　　　　　　　　　　　　　　
T. Ikeda; L. Haviez; Y. Li; G.J. Snyder
The 31st International & 10th European Conference on Thermoelectrics, 2012年07月09日, The International Thermoelectric Society

Nanostructure control and its impact on lattice thermal conductivity of bulk PbTe-base materials　　　　　　　　　　　　　　　
T. Ikeda; N. Bansal; W. Graf; Y. Pei; G.J. Snyder
The 31st International & 10th European Conference on Thermoelectrics, 2012年07月09日, The International Thermoelectric Society

Microstructure of nanostructured thermoelectrics studied by small angle neutron scattering　　　　　　　　　　　　　　　
Benedikt Klobes; Tania Claudio-Weber; Teruyuki Ikeda; Jeffrey Snyder; Raphael Hermann
2nd European Energy Conference, 2012年04月17日

Reduced thermal conductivity in Pb-alloyed AgSbTe2 thermoelectric materials　　　　　　　　　　　　　　　
Hsin-Jay Wu; Sinn-Wen Chen; Teruyuki Ikeda; G. Jeffrey Snyder
TMS 2012 141th Annual Meeting & Exhibition, 2012年03月12日, The Minerals, Metals and Materials Society

国際熱電学会

日本熱電学会

日本金属学会

多元素空間を網羅する環境調和性熱電材料のハイスループット探索　　　　　　　　　　　　　　　
基盤研究(C)
2024年04月 - 2027年03月

次世代交通システムを支える基盤自立電源の開発　　　　　　　　　　　　　　　
2021年06月 - 2023年03月

集まれ，熱源ハンター　　　　　　　　　　　　　　　
2021年10月 - 2022年03月

情報材料科学の発展を加速する多元系物質のハイスループット探索・測定戦略　　　　　　　　　　　　　　　
Research Booster
2020年 - 2021年03月

多元拡散対法を利用した新規ハイエントロピー材料の探索とハイスループット物性測定　　　　　　　　　　　　　　　
新学術領域研究(公募研究)
2019年04月 - 2021年03月

電子構造・フォノン分散の精密制御に基づく環境調和型熱電材料の創製　　　　　　　　　　　　　　　
基盤研究(B)
2017年04月 - 2020年03月

立体的熱界面制御と新しい高効率熱電変換システム　　　　　　　　　　　　　　　
基盤研究 (B)
2017年04月 - 2020年03月

IoT社会を支える分散型独立電源の技術開発　　　　　　　　　　　　　　　
2018年05月 - 2019年05月

大規模熱エネルギー回収を目指す超高熱伝達型熱電変換システムの創製　　　　　　　　　　　　　　　
H30年度研究推進経費 (Research Booster)
2018年07月 - 2019年03月

一方向に伸びた孔をもつ多孔質熱電材料を用いた新規流体透過型熱発電デバイスの創製　　　　　　　　　　　　　　　
H28年度茨城大学推進研究プロジェクト
2016年05月 - 2019年03月

ロータス型ポーラス熱電材料を用いた流体透過型超高効率熱電変換装置の創製　　　　　　　　　　　　　　　
2017年04月 - 2018年03月

低次元制御量子ナノ構造をもつバルク熱電材料の創製　　　　　　　　　　　　　　　
挑戦的萌芽研究
2016年04月 - 2018年03月

革新的ナノスケール制御による高効率熱電変換システムの実現　　　　　　　　　　　　　　　
2015年10月 - 2017年10月

高エネルギー非平衡状態を利用した熱電材料のナノ構造化と新機能　　　　　　　　　　　　　　　
基盤研究(B)一般
2014年04月 - 2017年03月

一方向に伸びた孔を有する流体透過型多孔質熱電材料の創製　　　　　　　　　　　　　　　
萌芽的研究
2014年12月 - 2016年03月

相変態を利用したバルク熱電材料のナノ構造化　　　　　　　　　　　　　　　
2008年10月 - 2012年03月

Nanostructuring of bulk thermoelectric materials utilizing phase transformations　　　　　　　　　　　　　　　
2008年 - 2011年

特開2019-165137, 特願2018-052531, 熱電変換モジュール
池田輝之,児島孝文,永野隆敏,井手拓哉,村上政明,沼田富行,中嶋英雄

US 8728340 B2, US20130153811 A1, 13/431107, Method for producing thermoelecetric material, thermoelectric material, and thermoelectric device
Teruyuki Ikeda, G. Jeffrey Snyder

WO 2013/094598 A1, PCT/JP2012/082782, Process for manufacturing thermoelectric material, thermoelectric material and thermoelectric transducer
Teruyuki Ikeda, Jeffrey Snyder

US 2012/0098162 A1, 13/282,178, Rapid hot pressing using an inductive heater
G. Jeffrey Snyder, Aaron LaLonde, Teruyuki Ikeda

4196181, 特開2004-325870, 特願2003-121606, 吸音材料
中嶋英雄,奥田良行,謝振凱,池田輝之

US 2007/0240750 A1, 11/714,694, Nanoscale thermoelectrics by bulk processing
G. Jeffrey Snyder, Teruyuki Ikeda, Sossina M. Haile, Vilupanur A. Ravi