May 2021, Light Metal R&D Furtherance Medal, JILM
Shigeru Kuramoto
Japan society

Nov. 2014, Light Metal Paper Prize, 7075アルミニウム合金の機械的特性と金属組織に及ぼす巨大ひずみ加工の影響, The Japan Institute of Light Metals
倉本繁、堀渕嘉代、青井一郎、大石敬一郎

Nov. 2012, Light Metal Advancement Award, アルミニウム合金とチタン合金の変形・破壊機構に関する研究, The Japan Institute of Light Metals
倉本繁

Sep. 2004, The Japan Institute of Metals and Materials Technical Development Award, 多機能チタン合金ゴムメタルの開発, The Japan Institute of Metals and Materials
古田忠彦、倉本繁、ファンジョンハン、伊東一彦、斎藤卓

Nov. 2002, Light Metal Paper Prize, AZ31マグネシウム合金の応力腐食割れ発生時の水素の挙動, The Japan Institute of Light Metals
倉本繁、荒木一郎、菅野幹宏

Nov. 2000, Light Metal Encouragement Prize, アルミニウム合金の粒界破壊の機構解明とその防止に関する研究, The Japan Institute of Light Metals
倉本繁

Long term and in situ measurements of nanostructure evolution of Al-3.9Cu-1.5Mg alloys by laboratory high energy small-angle X-ray scattering
Shin Fukuda; Masato Ohnuma; Goroh Itoh; Shigeru Kuramoto; Junya Kobayashi; Equo Kobayashi, The effect of nanostructures on the hardness of Al-3.9Cu-1.5Mg alloys with and without cold rolling (CR) during natural and isothermal aging at 190°C for up to 48 h has been investigated by in situ high energy laboratory small-angle X-ray scattering combined with micro-Vickers and calorimetry measurements. In the naturally aged samples, the formation of Cu-Mg co-clusters of 1 nm in diameter was observed. In the specimens with CR, the formation of clusters due to CR was observed at the beginning, while little change were observed during aging. Consequently, the total amount of clusters was less than in the specimens without CR in the later stage of natural aging. The change in the amount of age hardening corresponded to the change in the amount of Cu-Mg co-cluster formation, indicating that the Cu-Mg co-cluster was responsible for the precipitation strengthening at room temperature. At 190°C for the artificial aging process, precipitate scattering of three different sizes and shapes was observed, i.e., the intermediate and S phases were precipitated in addition to the Cu-Mg co-cluster. The continuous change in volume fraction and size with time suggests that the Cu-Mg co-cluster has grown into an intermediate phase. The time evolution of hardness at 190°C artificial aging without CR was simply explained by Orowan's equation. These results show that the dispersion state of precipitates mainly affects the hardness in Al-Cu-Mg alloys with low Cu/Mg ratios rather than the phases themselves., Elsevier BV
Materialia, Mar. 2025

Severe plastic deformation for producing Superfunctional ultrafine-grained and heterostructured materials: An interdisciplinary review
Kaveh Edalati; Anwar Q. Ahmed; Saeid Akrami; Kei Ameyama; Valery Aptukov; Rashid N. Asfandiyarov; Maki Ashida; Vasily Astanin; Andrea Bachmaier; Victor Beloshenko; Elena V. Bobruk; Krzysztof Bryła; José María Cabrera; Amanda P. Carvalho; Nguyen Q. Chinh; In-Chul Choi; Robert Chulist; Jorge M. Cubero-Sesin; Gregory Davdian; Muhammet Demirtas; Sergiy Divinski; Karsten Durst; Jiri Dvorak; Parisa Edalati; Satoshi Emura; Nariman A. Enikeev; Ghader Faraji; Roberto B. Figueiredo; Ricardo Floriano; Marjan Fouladvind; Daniel Fruchart; Masayoshi Fuji; Hiroshi Fujiwara; Marcell Gajdics; Diana Gheorghe; Łukasz Gondek; Joaquín E. González-Hernández; Alena Gornakova; Thierry Grosdidier; Jen Gubicza; Dmitry Gunderov; Liqing He; Oscar Fabian Higuera; Shoichi Hirosawa; Anton Hohenwarter; Zenji Horita; Jelena Horky; Yi Huang; Jacques Huot; Yoshifumi Ikoma; Tatsumi Ishihara; Yulia Ivanisenko; Jae-il Jang; Alberto M. Jorge; Mie Kawabata-Ota; Megumi Kawasaki; Tarek Khelfa; Junya Kobayashi; Lembit Kommel; Anna Korneva; Petr Kral; Natalia Kudriashova; Shigeru Kuramoto; Terence G. Langdon; Dong-Hyun Lee; Valery I. Levitas; Cong Li; Hai-Wen Li; Yongtao Li; Zheng Li; Huai-Jun Lin; Klaus-Dieter Liss; Ying Liu; Diana Maritza Marulanda Cardona; Kenji Matsuda; Andrey Mazilkin; Yoji Mine; Hiroyuki Miyamoto; Suk-Chun Moon; MullerTimo Müller; Jairo Alberto Muñoz; Maxim Yu. Murashkin; Muhammad Naeem; Marc Novelli; Dániel Olasz; Reinhard Pippan; Vladimir V. Popov; Elena N. Popova; Gencaga Purcek; Patricia de Rango; Oliver Renk; Delphine Retraint; Ádám Révész; Virginie Roche; Pablo Rodriguez-Calvillo; Liliana Romero-Resendiz; Xavier Sauvage; Takahiro Sawaguchi; Hadi Sena; Hamed Shahmir; Xiaobin Shi; Vaclav Sklenicka; Werner Skrotzki; Nataliya Skryabina; Franziska Staab; Boris Straumal; Zhidan Sun; Maciej Szczerba; Yoichi Takizawa; Yongpeng Tang; Ruslan Z. Valiev; Alina Vozniak; Andrei Voznyak; Bo Wang; Jing Tao Wang; Gerhard Wilde; Fan Zhang; Meng Zhang; Peng Zhang; Jianqiang Zhou; Xinkun Zhu; Yuntian T. Zhu, Elsevier BV
Journal of Alloys and Compounds, May 2024

〔Major achievements〕Effect of the Microstructures Adjacent to the Grain Boundaries on the Mechanical Properties and Hydrogen Embrittlement Susceptibilities of Al-Cu Alloys
Yuki Ishii; Junya Kobayashi; Shigeru Kuramoto; Goroh Itoh, 日本金属学会
Materials Transactions, Feb. 2024, [Reviewed]

Visualization of hydrogen and hydrogen-induced defects in tensile-deformed pure iron using hydrogen microprint and tritium autoradiography
Toshiaki Manaka; Goroh Itoh; Junya Kobayashi; Shigeru Kuramoto; Yuji Hatano
ISIJ International, Feb. 2024, [Reviewed]

〔Major achievements〕Effect of alloy compositions and aging conditions on tensile properties of cold-rolled Al-Mg-Si alloys
H. Fukuzawa; Y. Ishii; J. Kobayashi; E. Kobayashi; M. Ohnuma; S. Kuramoto; G. Itoh, Corresponding
Journal of the Japan Institute of Light Metals, Dec. 2023, [Reviewed]

Effect of Process Condition and Test Environment on Tensile Properties in Cold-Rolled Al-Cu-Mg Alloys
Yuki Ishii; Junya Kobayashi; Equo Kobayashi; Masato Ohnuma; Shigeru Kuramoto; Goroh Itoh
Solid State Phenomena, Dec. 2023, [Reviewed]

Effect of Thermomechanical Rolling on Mechanical Properties of TRIP-Aided Steel Sheet
Junya Kobayashi; Taichi Kimura; Shun Kudo; Genta Kojima; Tomohiko Hojo; Shigeru Kuramoto; Goroh Itoh
Materials Science Forum, Dec. 2023, [Reviewed]

〔Major achievements〕Effect of Stability of γ phase on Lüders-like Deformation Behavior of Cold-rolled Fe-Ni-Al-C Alloys
Yuwa Mori; Yuta Kawano; Junya Kobayashi; Shigeru Kuramoto; Satoshi Emura and Takahiro Sawaguchi, Corresponding, 日本鉄鋼協会
Tetsu-to-Hagané, Aug. 2023, [Reviewed]

〔Major achievements〕Mechanical Properties and Deformation Behavior in Severely Cold-Rolled Fe­-Ni­-Al­-C Alloys with Lüders Deformation - Overview with Recent Experimental Results -
Shigeru Kuramoto; Yuta Kawano; Yuwa Mori; Junya Kobayashi; Satoshi Emura and Takahiro Sawaguchi, Lead, 日本金属学会
Materials Transactions, Jul. 2023, [Reviewed]

〔Major achievements〕Nanoscale Analysis of Solute Distribution in Ultrahigh-Strength Aluminum Alloys
Equo Kobayashi; Masato Ohnuma; Shigeru Kuramoto; Junya Kobayashi and Goroh Itoh, Corresponding, 日本金属学会
Materials Transactions, Jul. 2023, [Reviewed]

Effect of Strain Rates on Mechanical Properties of a Duplex Stainless-Steel Sheet Charged in Hydrogen Plasma　　　　　　　　　　　　　　　
Afshin Yousefi; Goroh Itoh; Zoha Ghorani; Shigeru Kuramoto, Last
ISIJ International, Feb. 2023, [Reviewed]

〔Major achievements〕Mechanical properties of fine-grained flame resistant magnesium alloys processed with severe plastic deformation　　　　　　　　　　　　　　　
高須飛雅、木村健太郎、行武栄太郎、伊藤友美、野田雅史、染川英俊、土谷浩一、倉本繁, Corresponding, Japan Light Metals Welding Association
Journal of the Japan Light Metals Welding Association, Jun. 2022, [Reviewed]

〔Major achievements〕Nanomaterials by severe plastic deformation: review of historical developments and recent advances
Kaveh Edalati a; Andrea Bachmaier b; Victor A. Beloshenkoc; Yan Beygelzimer c; Vladimir D. Blankd; Walter J. Bottae; Krzysztof Bryłaf; Jakub Čížekg; Sergiy Divinski h; Nariman A. Enikeev i; j; Yuri Estrin k; l; Ghader Farajim; Roberto B. Figueiredon; Masayoshi Fuji o; Tadahiko Furutap; Thierry Grosdidierq; r; Jenő Gubicza s; Anton Hohenwarter t; Zenji Horitaa; u; v; w; Jacques Huotx; Yoshifumi Ikoma y; Miloš Janečekz; Megumi Kawasaki aa; Petr Králab; Shigeru Kuramotoac; Terence G. Langdon ad; Daniel R. Leivae; Valery I. Levitas ae; af; Andrey Mazilkinag; ah; Masaki Mitou; Hiroyuki Miyamotoai; Terukazu Nishizaki aj; Reinhard Pippanb; Vladimir V. Popovak; Elena N. Popovaak; Gencaga Purcekal; Oliver Renkb; Ádám Révészs; Xavier Sauvageam; Vaclav Sklenickaab; Werner Skrotzkian; Boris B. Straumalag; ah; Satyam Suwas ao; Laszlo S. Tothq; r; at; Nobuhiro Tsuji ap; aq; Ruslan Z. Valiev i; j; Gerhard Wildeh; Michael J. Zehetbauer ar and Xinkun Zhuas, Severe plastic deformation (SPD) is effective in producing bulk ultrafine-grained and nanostructured materials with large densities of lattice defects. This field, also known as NanoSPD, experienced a significant progress within the past two decades. Beside classic SPD methods such as high-pressure torsion, equal-channel angular pressing, accumulative roll-bonding, twist extrusion, and multi-directional forging, various continuous techniques were introduced to produce upscaled samples. Moreover, numerous alloys, glasses, semiconductors, ceramics, polymers, and their composites were processed. The SPD methods were used to synthesize new materials or to stabilize metastable phases with advanced mechanical and functional properties. High strength combined with high ductility, low/room-temperature superplasticity, creep resistance, hydrogen storage, photocatalytic hydrogen production, photocatalytic CO2 conversion, superconductivity, thermoelectric performance, radiation resistance, corrosion resistance, and biocompatibility are some highlighted properties of SPD-processed materials. This article reviews recent advances in the NanoSPD field and provides a brief history regarding its progress from the ancient times to modernity. Abbreviations: ARB: Accumulative Roll-Bonding; BCC: Body-Centered Cubic; DAC: Diamond Anvil Cell; EBSD: Electron Backscatter Diffraction; ECAP: Equal-Channel Angular Pressing (Extrusion); FCC: Face-Centered Cubic; FEM: Finite Element Method; FSP: Friction Stir Processing; HCP: Hexagonal Close-Packed; HPT: High-Pressure Torsion; HPTT: High-Pressure Tube Twisting; MDF: Multi-Directional (-Axial) Forging; NanoSPD: Nanomaterials by Severe Plastic Deformation; SDAC: Shear (Rotational) Diamond Anvil Cell; SEM: Scanning Electron Microscopy; SMAT: Surface Mechanical Attrition Treatment; SPD: Severe Plastic Deformation; TE: Twist Extrusion; TEM: Transmission Electron Microscopy; UFG: Ultrafine Grained.
Mater. Res. Lett., Apr. 2022, [Reviewed]

Effect of Alloy Composition and Process Conditions on Local Deformation Behavior in Beta Titanium Alloys　　　　　　　　　　　　　　　
K. Numata; S. Yonemura; S. Kuramoto; E. Nakagawa and T. Ohmura, Corresponding
Titanium Japan, 01 Apr. 2022, [Invited]

Effect of 90% cold rolling on precipitation behavior of Al-0.6Mg-1.0Si-0.5Cu alloy
N. Kirekawa; M. O; J. Kobayashi; M. Ohnuma; S. Kuramoto; G. Itoh; E. Kobayashi, Since 6000 series aluminum alloys have high hardness based on precipitation strengthening and good corrosion resistance, they are utilized as automobile body sheet panels in the industry. In order to reduce the weight of automobiles, further improvement of hardness is required. To improve the hardness, the process of severe plastic deformation before artificial aging (T8 treatment) was suggested. However, the effect of severe plastic deformation on the precipitation behavior of the alloys is not clear. In this study, 90% cold rolling was conducted for an Al-0.6Mg-1.0Si-0.5Cu alloy as the thermo-mechanical treatment. It was compared that precipitation behavior between T6 and T8 treated alloys by Micro Vickers hardness test, electrical conductivity measurement, differential scanning calorimetry and transmission electron microscopy. As the results, in T8 treated alloys, both precipitation strengthening and recovery softening happened during aging. However, the peak hardness of T8 treatment was larger than that of T6 treatment. The precipitation process was accelerated by lattice defects such as vacancies and dislocations introduced during 90% cold rolling. The precipitations in T8 treatment aged for 10.8 ks were identified as β'', β' and Q'. It was confirmed that β' (Q') phases precipitated directly along dislocations in 90% cold-rolled alloys.
Journal of the Japan Institute of Light Metals, Dec. 2021, [Reviewed]

Influence of microstructure-driven hydrogen distribution on environmental hydrogen embrittlement of an Al-Cu-Mg alloy
M. Safyari; M. Moshtaghi; S. Kuramoto; T. Hojo, Elsevier BV
International Journal of Hydrogen Energy, 22 Sep. 2021, [Reviewed]

Unraveling the effect of dislocations and deformation-induced boundaries on environmental hydrogen embrittlement behavior of a cold-rolled Al-Zn-Mg-Cu alloy
M. Moshtaghi; M. Safyari; S. Kuramoto; T. Hojo, Elsevier BV
International Journal of Hydrogen Energy, 05 Jan. 2021, [Reviewed]

Suppression of intergranular fracture in 7000 series aluminum alloys
Goroh Itoh; Keisuke Hiyama; Bofan Lyu; Junya Kobayashi; Shigeru Kuramoto, The 7000 series aluminum alloys suffer from intergranular fracture (IGF) that limits the use of the alloys, although they have highest strength among aluminum alloys. The types of IGF can be classified into two categories: (i) with smooth fracture surface showing practically no plastic deformation that takes place in hydrogen embrittlement and stress corrosion cracking, and (ii) with shallow and fine dimples on the fracture surface showing localized plastic deformation inside precipitate free zones. In this study, attempts have been made to suppress the IGF of both types by (a) controlling precipitate microstructure on grain boundaries by quench control and (b) controlling grain boundary morphology by strain induced boundary migration. The IGF of type (i) (hydrogen embrittlement) was successfully suppressed both by the two controlling processes., Trans Tech Publications Ltd
Materials Science Forum, 2021

On the role of traps in the microstructural control of environmental hydrogen embrittlement of a 7xxx series aluminum alloy
M. Safyari; M. Moshtaghi; S. Kuramoto, Last
Journal of Alloys and Compounds, 24 Sep. 2020, [Reviewed]

Environmental hydrogen embrittlement associated with decohesion and void formation at soluble coarse particles in a cold-rolled Al–Cu based alloy
M. Safyari; M. Moshtaghi; S. Kuramoto, Last
Materials Science and Engineering A, Jul. 2020, [Reviewed]

Investigation of strain rate sensitivity of Gum Metal under tension using digital image correlation
Karol Golasiński · Elżbieta Pieczyska· Michał Maj · Maria Staszczak · Paweł Świec · Tadahiko Furuta · Shigeru Kuramoto, Last, Springer
Archives of Civil and Mechanical Engineering, May 2020, [Reviewed]

TEM in-situ Observation of Deformation Behavior in a Beta Titanium Alloy, Gum Metal　　　　　　　　　　　　　　　
S. Kuramoto
Titanium Japan, 01 Apr. 2020, [Invited]

Assessment of hydrogen embrittlement susceptibility of an Al-Cu-Mg alloy in humid air
Toshiaki Manaka; Takahiro Suzuki; Keisuke Hiyama; Junya Kobayashi; Shigeru Kuramoto; Goroh Itoh, In the present study, we investigated the hydrogen embrittlement susceptibility of Al-4%Cu-1.5%Mg alloys subjected to several heat treatments by means of SSRT tensile test and humid gas stress corrosion cracking(HG-SCC) test. For SSRT tensile test, the tensile test pieces were cut from cold-rolled sheets of 1mm thickness. The test pieces were solution-treated at 500 °C for 1h, water-quenched and aged at 140oC for 72h or 360h. SSRT tensile test was performed in two environments, humid air (HA) and dry nitrogen gas (DNG) at a strain rate of 1.39×10^-6s^-1. Fracture surfaces were observed with a scanning electron microscopy(SEM). For HG-SCC test, compact tension(CT) test pieces were cut from hot-rolled plate of 6mm thickness. The CT test pieces were solution-treated, water-quenched and aged at 190 °C for 9h, 50°C for 96h or 140°C for 72h. HG-SCC test was carried out based on High Pressure Institute of Japan standards; HPIS E103:2018. The pre-cracked CT specimens with stress loading were kept for 90 days in two environments, HA and DNG. After 90 days, in order to observe whether cracks propagated due to HG-SCC, the specimens were loaded up to fracture rapidly, followed by SEM observation. Tensile properties obtained by SSRT tensile tests were almost the same in two environments. Also, fracture surfaces were not affected by test environments. Moreover, in HG-SCC tests, crack propagation was not observed at each test conditions. Therefore, Al-4%Cu-1.5%Mg alloy had high-resistance to hydrogen embrittlement., EDP Sciences
MATEC Web of Conferences, 2020

Effect of phase stability on local mechanical behavior in beta type titanium alloys
木村拓也; 倉本繁; 仲川枝里; 大村孝仁,

In general, the elastic modulus of a metallic material is proportional to the mechanical strength. A multi-functional beta titanium alloy, Gum Metal has been developed to have both low modulus and high strength after severe cold working. However, both its underlying mechanisms for multi-functional characteristics and its deformation mechanism have not yet been elucidated. In this study, nano-indentation and in-situ compression test in TEM have been performed to investigate the effect of phase stability on local mechanical behavior. We have examined the local mechanical behavior in Ti-18Mo alloy which has a higher bcc phase stability than Gum Metal. Nano-indentation tests revealed that the phase stability does not affect the local dynamic behavior. On the other hand, in situ compression test confirmed the effect of phase stability on the local mechanical behavior. Dislocation motion has been observed in Ti-18Mo alloy by in-situ compression tests in TEM, although such dislocation activity was not observed in Gum Metal in our previous study.

, 一般社団法人 軽金属学会
軽金属, 2020, [Reviewed]

Effect of strain rate on environmental hydrogen embrittlement susceptibility of a severely cold-rolled Al-Cu alloy
Mahdieh Safyari; Masoud Moshtaghi; Shigeru Kuramoto, Last
Vacuum, Nov. 2019, [Reviewed]

Effect of Fe-content on mechanical properties of cold-rolled Al–Fe–Si alloy foil
Takashi Suzuki; Shigeru Kuramoto; Goroh Itoh; Qi Cui
Journal of Japan Institute of Light Metals, Oct. 2019, [Reviewed]

〔Major achievements〕Influence of cold rolling on strength and resistance to hydrogen embrittlement in Al–8%Zn–2%Mg–2%Cu–0.15%Zr alloy　　　　　　　　　　　　　　　
Y. Sakaoka; S. Kuramoto; H. Kawabata; A. Kurumada, Corresponding
J. Jpn. Inst. Light Metals, 01 Jul. 2019, [Reviewed]

〔Major achievements〕Severe Plastic Deformation to Achieve High Strength and High Ductility in FeNi,Based Alloys with Lattice Softening　　　　　　　　　　　　　　　
Shigeru Kuramoto; Tadahiko Furuta, Lead, The Japan Institute of Metals and Materials
Materials Transactions, 07 Jun. 2019, [Reviewed], [Invited]

Influence of cold rolling on strength and resistance to hydrogen embrittlement in Al–8%Zn–2%Mg–2%Cu–0.15%Zr alloy　　　　　　　　　　　　　　　
H. Tadenuma; S. Kuramoto; J. Kobayashi; G. Itoh; K. Aoi; Y. Shimizu, Corresponding
J. Jpn. Inst. Light Metals, 01 Jun. 2019, [Reviewed]

Cracking Process Relates to Hydrogen Behavior in a Duplex Stainless Steel　　　　　　　　　　　　　　　
Afshin Yousefi; Goroh Itoh; Zoha Ghorani; Shigeru Kuramoto
ISIJ International, Jun. 2019, [Reviewed]

〔Major achievements〕Analysis of deformation behavior in beta titanium alloys using TEM in-situ observation　　　　　　　　　　　　　　　
K. Onose; S. Kuramoto; T. Suzuki; Ya-Ling CHANG; E. Nakagawa; T. Ohmura; C. Iwamoto, Corresponding
J. Jpn. Inst. Light Metals, 01 May 2019, [Reviewed]

Local Mechanical Response in a Beta Titanium Alloy of Gum Metal　　　　　　　　　　　　　　　
S. Kuramoto
Titanium Japan, 01 Apr. 2019, [Invited]

A finite strain elastic-viscoplastic model of Gum Metal　　　　　　　　　　　　　　　
K. Kowalczyk-Gajewska; E.A. Pieczyska; K. Golasiński; M. Maj; Shigeru Kuramoto; Tadahiko Furuta, Last, elsevier
International Journal of Plasticity, 21 Feb. 2019, [Reviewed]

Influence of microstructure adjacent to grain boundary on intergranular cracking in Al–Mg–Si alloys　　　　　　　　　　　　　　　
S. Ishizawa; S. Kuramoto; G. Itoh
J. Jpn. Inst. Light Metals, 01 Dec. 2018, [Reviewed]

〔Major achievements〕Effect of test environment on tensile properties of cold-rolled 7075 aluminum alloy　　　　　　　　　　　　　　　
Y. Nakajima; S. Kuramoto; J. Kobayashi; G. Itoh; K. Oh-ishi; I. Aoi; Y. Shimizu, Corresponding
J. Jpn. Inst. Light Metals, 01 Nov. 2018, [Reviewed]

Characterization of cold-rolled heterogeneous microstructure formed by multimodal deformation in an Fe-Ni-Al-C alloy with lattice softening
Tadahiko Furuta; Izuru Miyazaki; Keiichiro Oh-ishi; Shigeru Kuramoto; Akinobu Shibata; Nobihiro Tsuji, A heterogeneous microstructure in cold-rolled Fe-24.1Ni-4.06Al-0.43C with lattice softening, where C′ = (C11 − C12) / 2 is significantly reduced, was investigated through hierarchical analysis from the macroscale to nanoscale to determine the origin of the ultrahigh-strength and large ductility of the alloy. Microstructural analysis revealed that the heterogeneous microstructure in the developed Fe-based alloy exhibited a mixture of four kinds of morphology, formed through different deformation processes activated by the specific phase stability with lattice softening which arises at the limit of phase stability of austenite (fcc) phase. In addition to the reduced C′ the alloy is also characterized by the lowered stacking fault energy (SFE) and decreased the austenite-to-martensite (Ms) transformation temperature down to ambient temperature. These results suggest that both deformation twinning and stress-induced martensitic transformation are activated simultaneously or successively, in addition to dislocation glide, during cold rolling in the present alloy. On the basis of microstructural and mechanical characterization of the cold-rolled specimen, it is reasonable to conclude that the work-hardening induced by cold rolling activates a multimodal deformation mechanism which suppresses the premature failure during plastic deformation at ultrahigh-strength., Elsevier Ltd
Materials and Design, 05 Sep. 2018, [Reviewed]

Thermomechanical Studies of Yielding and Strain Localization Phenomena of Gum Metal under Tension
El˙zbieta A. Pieczyska; Michał Maj; Karol Golasi ´ nski; Maria Staszczak; Tadahiko Furuta and Shigeru Kuramoto, Last, This paper presents results of investigation of multifunctional β-Ti alloy Gum Metal subjected to tension at various strain rates. Digital image correlation was used to determine strain distributions and stress-strain curves, while infrared camera allowed for us to obtain the related temperature characteristics of the specimen during deformation. The mechanical curves completed by the temperature changes were applied to analyze the subsequent stages of the alloy loading. Elastic limit, recoverable strain, and development of the strain localization were studied. It was found that the maximal drop in temperature, which corresponds to the yield limit of solid materials, was referred to a significantly lower strain value in the case of Gum Metal in contrast to its large recoverable strain. The temperature increase proves a dissipative character of the process and is related to presence of ω and a" phases induced during the alloy fabrication and their exothermic phase transformations activated under loading. During plastic deformation, both the strain and temperature distributions demonstrate that strain localization for higher strain rates starts nucleating just after the yield limit leading to specimen necking and rupture. Macroscopically, it is exhibited as softening of the stress-strain curve in contrast to the strain hardening observed at lower strain rates., MDPI
materials, 07 Apr. 2018, [Reviewed]

Overcoming the strength–ductility trade-off via the formation of a thermally stable and plastically unstable austenitic phase in cold-worked steel　　　　　　　　　　　　　　　
I. Miyazaki; T. Furuta; K. Oh-ishi; T. Nakagaki; S. Kuramoto; A. Shibata; N. Tsuji, elsevier
Materials Science & Engineering A, 21 Feb. 2018, [Reviewed]

Yielding and strain localization effects in gum metal - A unique Ti alloy -investigated by digital image correlation and infrared thermography　　　　　　　　　　　　　　　
Elżbieta A. Pieczyska; Karol Golasiński; Michał Maj; Maria Staszczak; Zbigniew L. Kowalewski; Tadahiko Furuta; Shigeru Kuramoto, DANUBIA Adria Symposium on Advances in Experimental Mechanics
35th Danubia Adria Symposium on Advances in Experimental Mechanics, 2018

Effect of Alloying Elements on Anneal-Hardening Behavior of Aluminum Alloy Foils
Takashi Suzuki; Shigeru Kuramoto; Masaya Endo; Qi Cui, We observed that non-heat treatable Al-Fe-Mn alloy foils exhibit an increase in strength and a decrease in elongation due to low temperature annealing treatment subsequent to cold rolling. In this study, we investigate the effects of alloying elements on this anneal-hardening behavior. The alloys without alloying element of iron were not hardened by low temperature annealing treatment. On the other hand, the anneal-hardening behavior was observed only in Al-Fe based alloys containing manganese or chromium. These results are similar to "hardening by annealing" reported on severe plastic deformation of metal., SPRINGER INTERNATIONAL PUBLISHING AG
LIGHT METALS 2017, 2017, [Reviewed]

Infrared thermography applied for experimental investigation of thermomechanical couplings in Gum Metal
K. M. Golasinski; E. Pieczyska; M. Staszczak; M. Maj; T. Furuta; S. Kuramoto, Results of initial investigation of thermomechanical couplings in innovative -Ti alloy called Gum Metal subjected to tension are presented. The experimental set-up, consisting of testing machine and infrared camera, enabled to obtain stress-strain curves with high accuracy and correlate them to estimated temperature changes of the specimen during the deformation process. Both ultra-low elastic modulus and high strength of Gum Metal were confirmed. The infrared measurements determined average and maximal temperature changes accompanying the alloy deformation process, allowed to estimate thermoelastic effect, which is related to the alloy yield point. The temperature distributions on the specimen surface served to analyse strain localization effects leading to the necking and rupture., TAYLOR & FRANCIS LTD
QUANTITATIVE INFRARED THERMOGRAPHY JOURNAL, 2017, [Reviewed]

Microscopic study of gum-metal alloys: A role of trace oxygen for dislocation-free deformation
Naoyuki Nagasako; Ryoji Asahi; Dieter Isheim; David N. Seidman; Shigeru Kuramoto; Tadahiko Furuta, A class of Ti-Nb-Ta-Zr-O alloys called gum metal are known to display high strength, low Young's modulus and high elastic deformability up to 2.5%, simultaneously, and considered to deform by a dislocation-free deformation mechanism. A trace of oxygen (similar to 1%) in gum metal is indispensable to realize such significant properties; however, the detailed mechanism and the role of the oxygen has not been understood. To investigate an effect of trace oxygen included in gum metal, first-principles calculations for gum-metal approximants including zirconium and oxygen are performed. Calculated results clearly indicate that oxygen site with less neighboring Nb atom is energetically favorable, and that Zr-O bonding has an important role to stabilize the bcc structure of gum metal. The three-dimensional atom probe tomography (3-D APT) measurements for gum metal were also performed to identify compositional inhomogeneity attributed to the trace elements. From the 3-D APT measurements, Zr ions bonding with oxygen ions are observed, which indicates existence of Zr-O nano-clusters in gum metal. Consequently, it is found that (a) coexistence of Zr atom and oxygen atom improves elastical stability of gum metal, (b) inhomogeneous distribution of the compositions induced by the trace elements causes anisotropical change of shear moduli, and (c) Zr-O nano-clusters existing in gum metal are expected to be obstacles to suppress movemen of dislocations. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, Feb. 2016, [Reviewed]

Mechanical properties of Al-Zn-Mg-Cu alloys processed with high-pressure torsion
Shigeru Kuramoto; Ichiro Aoi; Tadahiko Furuta, It has been reported that tensile strength of the 7075 alloy, a commercial age-hardenable Al-Zn-Mg-Cu based alloy, is significantly improved by high-pressure torsion (HPT). The present research has been performed to study the effects of alloy compositions and process conditions on mechanical properties in Al-Zn-Mg-Cu alloys processed with HPT. Several Al-Zn-Mg(-Cu) alloys were melted and cast, and disc specimens of 10 mm diameter and 1 mm thick were machined from the homogenized ingots. The disc specimens were solution treated and subjected to HPT with a compression stress of 2 GPa at a rotation speed of 1 rpm. The torque at the steady state increased with increasing amount of alloying elements. The strength after HPT also increased with increasing amount of alloying elements. The tensile strength of Al-10%Zn-2%Mg-2%Cu alloy, in mass %, was increased to about 900 MPa by 10 turns of HPT processing., Springer International Publishing
Minerals, Metals and Materials Series, 2016, [Reviewed]

Gum Metal-unique properties and results of initial investigation of a new titanium alloy-extended paper
E. A. Pieczyska; M. Maj; T. Furuta; S. Kuramoto, Initial results of effects of thermomechanical couplings occurring in a new titanium alloy, called Gum Metal, subjected to tension loading are presented. The mechanical characteristics obtained by a testing machine confirm an ultra-low elastic modulus and high strength of the alloy. The temperature changes accompanying the alloy deformation process, obtained in a contactless manner by an infrared camera, related to the mechanical results were used to estimate yield limit basing on thermoelastic effect. It was found that the maximal drop in temperature, denoting the Yield point in solid materials, is related to significantly lower strain value in contrast to such a high limit of the reversible deformation, which characterizes the Gum Metal alloy. Furthermore, the temperature distribution on the specimen surface allowed to investigate development of the strain localization leading to the specimen necking and rupture., CRC PRESS-TAYLOR & FRANCIS GROUP
ADVANCES IN MECHANICS: THEORETICAL, COMPUTATIONAL AND INTERDISCIPLINARY ISSUES, 2016, [Reviewed]

アルミニウム材料の技術開発の現状と将来展望　　　　　　　　　　　　　　　
小林純也; 倉本 繁; 伊藤吾朗
プレス技術, 2016, [Invited]

Basic Deformation Mechanism of Bcc Titanium-Based Alloy of Gum Metal
Yasushi Kamimura; Satoru Katakura; Keiichi Edagawa; Shin Takeuchi; Shigeru Kuramoto; Tadahiko Furuta, Single crystals and cold-swaged polycrystalline specimens of Gum Metal of Ti-36Nb-2Ta-3Zr-0.3O (mass %) have been compressed with the stress-relaxation test in the temperature range from 77 K to 450 K. In both single crystals and cold-swaged specimens, the yield stress decreases with increasing temperature rapidly to the room temperature and then gently above it forming a plateau at high temperature. The activation analysis of plastic deformation showed that the applied shear stress dependence of activation enthalpy and that of activation volume for single crystals and those for cold swaged specimens are almost identical if we shift the stress scale by about 120 MPa, meaning that the basic deformation mechanism is common to both samples. The above results are contradictory with the previously proposed non-dislocation deformation mechanism at the ideal shear strength, but consistent with the established features of usual bcc alloys, i.e., the deformation is governed by the Peierls mechanism at low temperature and by defect hardening at high temperature tau(chi) - chi and psi - chi relations of single crystals showed a typical slip asymmetry seen in bcc metals, where slip in Gum Metal belongs to the {112} slip type as in binary Ti-Nb single crystals reported previously (S. Hanada et al.: Metall. Trans. A 16 (1985) 789). Yielding by massive {332} < 113 > twin formation in single crystals at low temperatures was observed for the first time in Gum Metal., JAPAN INST METALS
MATERIALS TRANSACTIONS, 2016, [Reviewed]

Improved Combination of Strength and Ductility in Zirconium-Added Al-Zn-Mg-Cu Alloy Processed with High-Pressure Torsion
Hiroyuki Kawabata; Ichiro Aoi; Keiichiro Oh-ishi; Takanori Nakagaki; Yoshihiro Shimizu; Shigeru Kuramoto, To realize high-strength and high-ductility aluminum alloys, an Al-Zn-Mg-Cu-based alloy was produced by high-pressure torsion (HPT) processing. The chromium in the alloy was replaced with zirconium, and the iron content of the alloy was decreased to avoid ductility loss due to iron-containing intermetallic compounds formed during crystallization. The microstructures and mechanical properties of the processed alloy were investigated. The grains were elongated perpendicular to the rotation axis. The elongation of the alloy containing chromium decreased with increasing number of turns. In the case of the alloy in which chromium was replaced with zirconium, the strength increased with increasing number of turns, without reducing the elongation. The alloy exhibited an ultimate tensile strength of 929 MPa and an elongation of 6.4%., JAPAN INST METALS
MATERIALS TRANSACTIONS, 2016, [Reviewed]

Thermally Activated Deformation of Gum Metal:,A Strong Evidence for the Peierls Mechanism of DeformationSoftening and Multimodal-structure Formation
Y. Kamimura; S. Katakura; K. Edagawa; S. Takeuchi; S. Kuramoto; T. Furuta, Compression deformation and stress relaxation tests have been made over a wide temperature range for Ti-based bcc alloy single crystal of Gum Metal composition to elucidate the deformation mechanism. The shear yield stress decreases rapidly with increasing temperature with decreasing slope above room temperature, tending to level off. Activation analysis showed that the activation volume becomes smaller than 10 b(3) (b: the Burgers vector) at high stress, indicating that the deformation is controlled by the Peierls mechanism at low temperature. Similar results have been obtained also for severely cold-swaged polycrystalline Gum Metal with the similar composition. These results contradict the generally accepted dislocation-free mechanism of Gum Metal., JAPAN INST METALS
Materials Transactions, Dec. 2015, [Reviewed]

MECHANICAL PROPERTIES OF Al-(8, 10)%Zn-2%Mg-2%Cu BASE ALLOYS PROCESSED WITH HIGH-PRESSURE TORSION　　　　　　　　　　　　　　　
I. Aoi; S. Kuramoto; K. Oh-ishi, TMS
Light Metals 2015, Mar. 2015, [Reviewed]

MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Mg-1at%X ALLOYS PROCESSED WITH HIGH-PRESSURE TORSION　　　　　　　　　　　　　　　
H. Kawabata; S. Kuramoto; K. Oh-ishi, TMS
Magnesium Technology 2015, Mar. 2015, [Reviewed]

〔Major achievements〕Die-hard plastic deformation behavior in an ultrahigh-strength Fe–Ni–Al–C alloy
T. Furuta; S. Kuramoto; T. Ohsuna; K. Oh-ishi; K. Horibuchi, Corresponding, An important property of metallic materials is their ability to deform plastically. Ductility enables materials to be formed into various shapes and guarantees reliability under structural use. However, there is a trade-off relationship between ductility and strength. Here, we show a cold-worked Fe-24.6%Ni-5.8%Al-0.44%C alloy having yield strength of approximately 2 GPa, and a uniform elongation of over 20%. Activation of two or more deformation mechanisms is considered to be responsible for this "die-hard" plastic deformation with continuous, inhomogeneous strain hardening. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
Scripta Materialia, Feb. 2015, [Reviewed]

High Strength and High Uniform Ductility in a Severely Deformed Iron Alloy by Lattice Softening and Multimodal-structure Formation
K. Edalati; T. Furuta; T. Daio; S. Kuramoto; Z. Horita, Despite high strength of nanostructured alloys, they usually exhibit poor uniform ductility. For many applications, it is an important issue to design new nanostructured alloys which have both high strength and high uniform ductility. In this study, an Fe-Ni-Al-C alloy with ultrahigh tensile strength of 1.9-2.2 GPa and high uniform ductility of 16-19% was developed by concurrent employment of several strategies: (i) appropriate choice of chemical compositions for lattice softening, (ii) severe plastic deformation using the high-pressure torsion method for grain refinement, and (iii) control of strain level for multimodal-structure formation composed of equiaxed nanograins, lamellar coarse grains and fine precipitates., TAYLOR & FRANCIS INC
Materials Research Letters, 2015, [Reviewed]

〔Major achievements〕Effect of severe plastic deformation on mechanical properties and microstructure in 7075 aluminum alloy　　　　　　　　　　　　　　　
S. Kuramoto; K. Horibuchi; I. Aoi; K. Oh-ishi, Lead, The commercial Al-Zn-Mg-Cu base 7075 alloy has been reported to have significantly high tensile strength after high-pressure torsion (HPT) process, one of the typical methods of severe plastic deformation. This strengthening can be attributed to high dislocation density, grain refinement, nano-scale solute clustering in the interior of grains, and/or solute segregation to grain boundaries. However, the details in the strengthening mechanism remain unknown. In the present study, transmission electron microscopy (TEM) analysis has been made to characterize the change in microstructure during HPT. Disc specimens of 10 mm diameter and 1 mm thick were machined from extruded bar of commercial 7075 alloy, and solution treated for 5 h at 480°C. The solution treated specimen was subjected to HPT process under compression stress of 2 GPa and rotation speed of 1 rpm for 10 turns. The TEM analyses were made on the specimen taken from the place 2.5 mm apart from disc center. Localized concentrations of solute atoms to grain boundaries are observed in the HPTed specimen. The strengthening mechanism will be discussed in relation to the observed changes in deformation microstructure., Japan Institute of Light Metals
Journal of The Japan Institute of Light Metals, Jun. 2014, [Reviewed]

Mechanical properties and microstructure of hydrogen-charged Gum metal
Shin-ichi Towata; Tadahiko Furuta; Hiroaki Kadoura; Tatsuo Noritake; Shigeru Kuramoto, The influence of hydrogen uptake on the microstructure and mechanical properties of swaged Gum metal rods was investigated. The Gum metal rod absorbed hydrogen under moderate hydrogen pressure at elevated temperatures. For a hydrogen content (hydrogen to metal ratio H/M) of 0.2 < HIM < 0.4, marked grain refinement was observed, and the strain-to-failure increased beyond that of a swaged specimen while maintaining yield stress and ultimate tensile strength. Since grain refinement was not observed in recrystallized specimens, it was deduced that lattice defects induced during the swaging process play an important role in grain refinement with charged hydrogen. The ductile-to-brittle transition of the fracture mode was observed at H/M > 0.4. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, Apr. 2014, [Reviewed]

Mechanical properties of Al-Zn-Mg-Cu alloys processed with high-pressure torsion
Shigeru Kuramoto; Ichiro Aoi; Tadahiko Furuta, It has been reported that tensile strength of the 7075 alloy, a commercial age-hardenable Al-Zn-Mg-Cu based alloy, is significantly improved by high-pressure torsion (HPT). The present research has been performed to study the effects of alloy compositions and process conditions on mechanical properties in Al-Zn-Mg-Cu alloys processed with HPT. Several Al-Zn-Mg(-Cu) alloys were melted and cast, and disc specimens of 10 mm diameter and 1 mm thick were machined from the homogenized ingots. The disc specimens were solution treated and subjected to HPT with a compression stress of 2 GPa at a rotation speed of 1 rpm. The torque at the steady state increased with increasing amount of alloying elements. The strength after HPT also increased with increasing amount of alloying elements. The tensile strength of Al-10%Zn-2%Mg-2%Cu alloy, in mass %, was increased to about 900 MPa by 10 turns of HPT processing., Minerals, Metals and Materials Society
TMS Light Metals, 2013

The mechanism of strength and deformation in Gum Metal　　　　　　　　　　　　　　　
T. Furuta; S. Kuramoto; J. W. Morris; Jr.; N. Nagasako; E. Withey; D. C. Chrzan, Corresponding
Scripta Materialia, 2013, [Reviewed], [Invited]

Dynamic recrystallization and recovery during high-pressure torsion: Experimental evidence by torque measurement using ring specimens
Kaveh Edalati; Zenji Horita; Tadahiko Furuta; Shigeru Kuramoto, Several pure metals exhibit softening when imparting large strains at room temperature. This study investigates the nature of this strain softening. Torque measurements during high-pressure torsion using ring specimens, which appear to be more suitable than disk specimens for the evaluation of the strain response on the in situ flow stress, suggest that the softening in aluminum occurs mainly by dynamic recrystallization and recovery, whereas no appreciable dynamic softening occurs in copper. The softening in aluminum is associated with decreasing the dislocation density and increasing the grain size and missorientation angles, whereas copper exhibits ultrafine grains of higher dislocation density and few nanotwins. A significant static recrystallization is detected in HPT-processed pure copper by argon irradiation during ion milling. (C) 2012 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE SA
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, Jan. 2013, [Reviewed]

Strengthening the Alloys with Elastic Softening in Shear Modulus C’
S. Kuramoto; T. Furuta; N. Nagasako; Z. Horita, Lead, A multifunctional titanium based alloy, Gum Metal, has very low C' (=(C-11 - C-12)/2), which is similar to shape memory alloys (SMAs). The Peierls stress would be relatively low in such low C' alloys, however, it has been reported that dislocation activity in Gum Metal is suppressed up to its ideal shear strength. Recently, a Fe-Ni-Co-Ti alloy with very fine grain size processed by severe plastic deformation (SPD) has also been reported to have similar mechanical properties to Gum Metal. In the present paper, some recent discussions on elastic and plastic behaviors in these alloys were summarized. The reduced C' enhances elastic anisotropy and significantly decreases the ideal shear strength. It also results in significant core spreading of screw dislocations which can raise the critical shear stress for dislocation glide, if such cores interact with other neighboring ones, solute elements or solute clusters. Mechanical responses to loading were also discussed in Gum Metal and the SPDed Fe-Ni-Co-Ti alloy using stress-temperature diagram, which has been often used to explain the behavior of SMAs. (C) 2012 Elsevier B.V. All rights reserved., ELSEVIER SCIENCE SA
J. Alloys and Comp., 2013, [Reviewed]

Development of ultrahigh strength and high ductility in nanostructured iron alloys with lattice softening and nanotwins
Kaveh Edalati; Shoichi Toh; Tadahiko Furuta; Shigeru Kuramoto; Masashi Watanabe; Zenji Horita, Bulk nanostructured materials exhibit high strength but very low ductility. In this study, ductile nanostructured iron-base alloys are successfully developed using a combination of three strategies: appropriate choice of chemical compositions for lattice softening, severe plastic deformation using high-pressure torsion for grain refinement, and annealing for nanotwin formation. Accordingly, exceptional performance of both ultrahigh strength, 2.3-3 GPa, and high elongation to failure, 10-20%, which has never been reported for metallic materials, is achieved. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
SCRIPTA MATERIALIA, Sep. 2012, [Reviewed]

ANOMALOUS PLASTIC BEHAVIOR WITH LOCALIZED LATTICE ROTATION IN GUM METAL
Shigeru Kuramoto; Daigo Setoyama; Tadahiko Furuta; Elizabeth Withey; John W. Morris, Anomalous plastic deformation behavior of Gum Metal, Ti-36Nb-2Ta-3Zr-0.3O alloy (mass %), was analyzed in nano-pillar specimens during in situ nano-compression test. The diffraction patterns during compressive deformation showed that crystal rotation of as much as 30 degrees occurs in the small deformed area of the pillar specimens. The local crystal rotation behavior is attributed to a deformation mechanism that operates at very high flow stress near ideal shear strength., INEGI-INST ENGENHARIA MECANICA E GESTAO INDUSTRIAL
ICEM15: 15TH INTERNATIONAL CONFERENCE ON EXPERIMENTAL MECHANICS, 2012, [Reviewed]

Strengthening of Alloys with Elastic Anisotropy by Severe Plastic Deformation
Shigeru Kuramoto; Tadahiko Furuta; Naoyuki Nagasako; Zenji Horita, Effects of the elastic anisotropy on deformation behavior are examined in a Ti-23%Nb-0.7%Ta-2%Zr-1.2%O (in at %) alloy, Gum Metal, and in an Fe-19%Ni-34%Co-8%Ti alloy with body centered cubic (bcc) crystal structure, and microstructural development in the iron based alloy during severe plastic deformation (SPD) process is discussed. Strong elastic anisotropy with reduced shear modulus, C-11- C-12, results in low ideal shear strength, which implies dislocation mediated plasticity easily occurs at lower stress. On the other hand, high pressure torsion (HPT), a typical SPD method, realizes very high shear stress during processing, which seems to reach the ideal shear strength in these alloys. Significant refinement of the grain size to 20 - 50 nm in the Fe-Ni-Co-Ti alloy is discussed in relation to the unique deformation mechanism which might be activated at ideal shear strength., TRANS TECH PUBLICATIONS LTD
THERMEC 2011, PTS 1-4, 2012, [Reviewed]

Shear Strength Measurement of Gum Metal during High-Pressure Torsion
Tadahiko Furuta; Shigeru Kuramoto; Naoyuki Nagasako; Zenji Horita, In the present study, in situ measurements of applied torque and compressive load were conducted during high-pressure torsion (HPT) on Ti-23%Nb-0.7%Ta-2.0%Zr-1.2%O (in at %), Gum Metal, by using four active strain-gage method. The shear stress was then calculated from the measured torque. The in situ measurements revealed that the maximum shear stress reaches similar to 2 GPa during HPT. This value is comparable to the ideal shear strength of Gum Metal, which was reported as similar to 1.8 GPa from experiments using single crystals. The deformation mechanism strongly depends on body-centered cubic (bcc) phase stability at an early stage of HPT straining, where the shear stress is well below the ideal shear strength. On the other hand, the deformation mechanism may be insensitive to the bcc phase stability at a later stage of HPT straining, where plastic deformation occurs at a strength close to the ideal shear strength., TRANS TECH PUBLICATIONS LTD
THERMEC 2011, PTS 1-4, 2012, [Reviewed]

Low Young's modulus in Ti-Nb-Ta-Zr-O alloys: Cold working and oxygen effects　　　　　　　　　　　　　　　
M. Tane; T. Nakano; S. Kuramoto; M. Hara; M. Niinomi; N. Takesue; T. Yano; H. Nakajima
Acta Materialia, 2012

Ultrahigh strength of nanocrystalline iron-based alloys produced by high-pressure torsion
Tadahiko Furuta; Shigeru Kuramoto; Kayo Horibuchi; Tetsu Ohsuna; Zenji Horita, Microstructural evolution of an Fe-18.1%Ni-34.9%Co-9.3%Ti (in at.%) in processing by high-pressure torsion (HPT) was investigated by electron backscatter diffraction. After 10 turns of HPT straining at room temperature with a rotation speed of 1 rpm under a pressure of 6 GPa, the alloy was composed of body-centered cubic-structured grains with sizes of 20-50 nm having high density crystal defects inside the grains. The mechanism of this significant grain refinement was discussed in relation to the stress-induced martensitic transformation and transgranular shear near ideal strength. The actual shear stress of the nanocrystalline iron-based alloy was estimated to be 1.37 GPa and as high as 38% of the ideal shear stress, which is similar to Gum Metal exhibiting deformation without dislocation activity. It is inferred from these results that the dislocation motion can be suppressed up to ultrahigh stress level near ideal strength by the formation of nano-sized grains., SPRINGER
JOURNAL OF MATERIALS SCIENCE, Sep. 2010, [Reviewed]

DEFORMATION IN Ti-Nb-Ta-Zr-O ALLOY AT NEAR IDEAL STRENGTH
Shigeru Kuramoto; Tadahiko Furuta; Naoyuki Nagasako; Masashi Hara, Recent experimental results on phase stability and deformation behavior in a multifunctional Ti-36Nb-2Ta-3Zr-0.3O alloy, Gum Metal, are summarized and its deformation mechanisms are discussed. The crystal structure of the alloy is essentially unstable to tensile loading in < 110 > direction, but the microstructure of the cold worked state stabilizes the crystal structure. Work hardening in Gum Metal was far smaller than the other materials even when huge amount of strain is accumulated by severe plastic deformation. By comparing actual applied stress during plastic deformation with ideal shear strength, the alloy is likely to deform at near ideal strength with stress concentrations along with the highly inhomogeneous deformation behavior., TRANS TECH PUBLICATIONS LTD
THERMEC 2009, PTS 1-4, 2010, [Reviewed]

Anomalous transformation-induced deformation in <110> textured Gum Metal
J. W. Morris; Jr.; Y. Hanlumyuang; M. Sherburne; E. Withey; D. C. Chrzan; S. Kuramoto; Y. Hayashi; M. Hara, Tensile tests on single crystals of Gum Metal (Ti-36Nb-2Ta-3Zr-0.3O (wt.%)) showed, anomalously, that while a stress-induced beta(bcc) -> alpha''(orthorhombic) transformation occurred in a crystal pulled in the < 1 1 0 > direction, (1) no transformation was observed in crystals pulled in the < 1 0 0 > or < 1 1 1 > directions and (2) little or no transformation occurred in severely worked rods, which are poly-crystals with very strong < 1 1 0 > texture. Analysis of the energetics of the beta -> alpha" transformation offers straightforward explanations: (1) an alpha" precipitate has zero elastic energy if it forms as a thin plate with the habit {1 1 1.5}; a < 1 1 0 > tensile load significantly decreases the energy of this plate; loading along < 1 0 0 > or < 1 1 1 > is less effective; (2) while worked rods have a strong < 1 1 0 > axial texture, the perpendicular planes are severely distorted, increasing the elastic energy of a" and inhibiting the transformation. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
Acta Materialia, 2010, [Reviewed]

The deformation of Gum Metal through in situ compression of nanopillars
E. A. Withey; A. M. Minor; D. C. Chrzan; J. W. Morris; Jr.; S. Kuramoto, Last, The name "Gum Metal" has been given to a set of beta-Ti alloys that achieve exceptional elastic elongation and, with appropriate preparation, appear to deform by a dislocation-free mechanism triggered by elastic instability at the limit of strength. We have studied the compressive deformation of these materials with in situ nanocompression in a quantitative stage in a transmission electron microscope. The samples studied are cylindrical nanopillars 80-250 nm in diameter. The deformation pattern is monitored in real time using bright-field microscopy, dark-field microscopy or electron diffraction. Interesting results include the following: (i) nanopillars approach, and in several examples appear to reach, ideal strength; (ii) in contrast to conventional crystalline materials, there is no substantial "size effect" in pillar strength; (iii) the deformation mode is fine-scale with respect to the sample dimension, even in pillars of 100 nm size; (iv) shear bands ("giant faults") do form in some tests, but only after yield and plastic deformation; and (v) a martensitic transformation to the base-centered orthorhombic alpha '' phase is sometimes observed, but is an incidental feature of the deformation rather than a significant cause of it. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
Acta Materialia, 2010

〔Major achievements〕Lattice softening for producing ultrahigh strength of iron base nanocrystalline alloy
S. Kuramoto; T. Furuta; N. Nagasako; Z. Horita, Lead, One can increase the strength of metallic materials by pinning dislocations with nanoscale obstacles, as the dislocations facilitate plastic deformation. However, simultaneous achievement of the ultrahigh strength and the ductility is extremely difficult in conventional metallic materials. Here we show that the ultrahigh strength iron base alloy with enhanced ductility, whose strength is approaching ideal strength and being twice as much as the upper limit of conventional alloys, can be realized by introducing the paradox concept of lattice softening. Designing atomic arrangement with specific electronic structure creates the lattice softening, and a nanograined structure is then produced by subsequent processing with severe plastic deformation., AMER INST PHYSICS
Applied Physics Letters, Nov. 2009, [Reviewed]

Single-crystal growth of Ti-Nb-Ta-Zr-O alloys and measurement of elastic properties
Naohisa Takesue; Yusuke Shimizu; Takeshi Yano; Masashi Hara; Shigeru Kuramoto, Single crystals of β-type Ti alloy system Ti-Nb-Ta-Zr-O have been grown successfully in an Ar gas flow by a floating zone method. The growth orientations were determined approximately by using seed crystals with the desired orientations. The various growth conditions were realized by choosing the gas purity, the gas flow rate, and the growth rate as variables. Composition analysis of the grown crystals was done to check any variation from the values of the raw material along with the bulk homogeneity, followed by measurements of the lattice parameter and the hardness, which provides the following results: (1) the composition of oxygen varies with respect to the flow rate, or is increased as the purity is degraded, (2) the lattice parameter is increased with increasing composition of oxygen, (3) which is also the case with the hardness. Measurements of Young's moduli were performed to investigate the elastic properties. The results indicate that the crystals exhibit the anisotropy which was expected previously. The elastic constants were estimated from the moduli, giving the ideal stress 1.7-1.9 GPa which is on a level with the real strength. Additionally, the tensile stress-strain curve for the crystallographic direction 〈1 1 0〉 exhibited nonlinear elasticity and hysteresis. © 2009 Elsevier B.V. All rights reserved.
Journal of Crystal Growth, 01 Jun. 2009

Mechanical anisotropy and ideal strength in a multifunctional Ti-Nb-Ta-Zr-O alloy (Gum Metal)
Masashi Hara; Yusuke Shimizu; Takeshi Yano; Naohisa Takesue; Tadahiko Furuta; Shigeru Kuramoto, An ideal shear strength of Gum Metal, a newly developed set of beta-type titanium alloys with the nominal composition Ti-24(Nb + V + Ta)-(Zr, Hf)-O (at.%) believed to deform without motion of crystal dislocations, has been investigated experimentally for precise determination. Tensile tests of single crystals of Gum Metal along the (100), (110), and (111) directions showed that the Young's moduli were 40, 60, and 86 GPa, respectively. The elastic constants were estimated as C(11)- C(12) = 25-27 GPa and C(44) = 29-36 GPa. In terms of these values, the anisotropy factor and the ideal strength were evaluated as 2.3-2.6 and 1.7-1.9 GPa, respectively. It was found that a ratio of the actual ultimate tensile strength to the ideal strength for Gum Metal was much higher than for other bcc metals., CARL HANSER VERLAG
INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, Mar. 2009, [Reviewed]

Elastic properties of Gum Metal
Shigeru Kuramoto; Tadahiko Furuta; Junghwan Hwang; Kazuaki Nishino; Takashi Saito, In situ X-ray diffraction measurements under tensile loading and dynamic mechanical analysis were performed to investigate the mechanisms of elastic deformation in Gum Metal. Tensile stress-strain curves for Gum Metal indicate that cold working substantially decreases the elastic modulus while increasing the yield strength, thereby confirming nonlinearity in the elastic range. The gradient of each curve decreased continuously to about one-third its original value near the elastic limit. As a result of this decrease in elastic modulus and nonlinearity, elastic deformability reaches 2.5% after cold working. Superelasticity is attributed to stress-induced martensitic transformations, although the large elastic deformation in Gum Metal is not accompanied by a phase transformation. © 2006 Elsevier B.V. All rights reserved.
Materials Science and Engineering A, 20 Dec. 2006

Effect of oxygen on phase stability and elastic deformation behavior in gum metal
Tadahiko Furuta; Shigeru. Kuramoto; Chen Rong; Junghwang Hwang; Kazuaki Nishino; Takashi Saito; Masahiko Ikeda, Effect of oxygen on phase stability and elastic deformation behavior after cold working of Ti-Nb-Ta-Zr-O alloys were investigated by employing tensile test, microstructure observations, in-situ XRD analysis, and electrical resistivity measurements. The specimens were Ti-36%Nb-2%Ta-3%Zr-0.35%O (mass%) alloy (Gum Metal) and the reference alloys having lower and higher oxygen contents (from 0.07% to 0.93%) than that in Gum Metal. Pseudo-elastic deformation with rearrangements of alpha" variants was observed in the specimen with 0.07% oxygen content. As the oxygen content was increased, the generation of alpha" was suppressed and yield strength was increased. The elastic behavior in Gum Metal with 0.35% oxygen content showed non-linearity, with the slope of the stress-strain curve in the elastic region continuously decreasing with stress increase. In-situ XRD measurements during tensile loading in Gum Metal showed that all beta peaks shift monotonically to higher 2 theta angles with increasing tensile strain up to 2.7%. This result indicates that elastic behavior in Gum metal is not accompanied by phase transformation, such as stress-induced alpha". The higher oxygen content alloy with 0.93% had linear elastic deformation behavior and a yield strength of about 1600 MPa. Additionally, the starting temperature of athermal omega formation was lowered with increasing oxygen and cold working., JAPAN INST METALS
JOURNAL OF THE JAPAN INSTITUTE OF METALS, Jul. 2006, [Reviewed]

Nanodisturbances in deformed Gum Metal
Mikhail Yu. Gutkin; Toshitaka Ishizaki; Shigeru Kuramoto; Ilya A. Ovid'ko, Systematic experiments have been performed to characterize defect structures in deformed Gum Metal, a special titanium alloy with high strength, low Young's modulus, excellent cold workability and low resistance to shear in certain crystallographic planes. Results from high-resolution transmission electron microscopy characterization reveal nanodisturbances (planar nanoscopic areas of local shear) as typical elements of defect structures in deformed Gum Metal. A theoretical model is suggested describing nanodisturbances as nanoscale dipoles of non-conventional partial dislocations with arbitrary, non-quantized Burgers vectors. It is shown theoretically that the homogeneous generation of nanodisturbances is energetically favorable in Gum Metal, where they effectively carry plastic flow. (c) 2006 Acta Materialia, Inc. Published by Elsevier Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, May 2006, [Reviewed]

EBSP analysis on microstructure of gum metal after plastic deformation
Shigeru Kuramoto; Tadahiko Furuta; Junghwan Hwang; Kazuaki Nishino; Takashi Saito, EBSP (electron backscattering pattern) analysis was performed on microstructure of three β titanium alloy specimens after cold working to study peculiar plastic behavior of the multifunctional alloy, Gum Metal. The specimens employed were Ti-36% Nb-2%Ta-3%Zr-0.3%O (mass%) alloy (Gum Metal) and two reference alloys having lower and higher bcc phase stability than that of Gum Metal. Deformation twinning of {332} 〈113〉 was observed in the specimen with lower bcc stability, and dislocation glide in the specimen with higher bcc stability. Orientation boundaries with rotation angle of 10-30 degrees were observed in Gum Metal specimen, and they are considered to be identical to the giant planar faults which were observed in TEM in the previous study. It seems that the giant faults act as grain boundaries and numerous subgrains are generated in the later stage of plastic deformation. Amount of crystallographic rotation in deformed Gum Metal specimens was very large, which implies that huge elastic energy was stored during plastic deformation. © 2005 The Japan Institute of Metals.
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Nov. 2005

〔Major achievements〕Multifunctional alloys obtained via a dislocation-free plastic deformation mechanism
T. Saito; T. Furuta; J. H. Hwang; S. Kuramoto; K. Nishino; N. Suzuki; R. Chen; A. Yamada; K. Ito; Y. Seno; T. Nonaka; H. Ikehata; N. Nagasako; C. Iwamoto; Y. Ikuhara; T. Sakuma, We describe a group of alloys that exhibit "super" properties, such as ultralow elastic modulus, ultrahigh strength, super elasticity, and super plasticity, at room temperature and that show Elinvar and Invar behavior. These "super" properties are attributable to a dislocation-free plastic deformation mechanism. In cold-worked alloys, this mechanism forms elastic strain fields of hierarchical structure that range in size from the nanometer scale to several tens of micrometers. The resultant elastic strain energy leads to a number of enhanced material properties., AMER ASSOC ADVANCEMENT SCIENCE
Science, Apr. 2003

Analysis of Trace Amounts of Emitted Gases during Fracture of High-Purity Alumina under Ultrahigh Vacuum : Effects of Sintering Atmosphere and Sintering Time on Gas Emission Beharior
MATSUMOTO Mineaki; KITAOKA Satoshi; MATSUBARA Hideaki; KURAMOTO Shigeru; KANNO Mikihiro, The effects of sintering atmosphere and sintering time on gas emission behavior during fracture of high-purity Al_2O_3 were investigated under ultrahigh vacuum using a mass spectrometer to examine the behavior of gases in the material. The gas in the sintering atmosphere was predominantly emitted at the moment of fracture for all specimens. The total amount of gas emitted from a specimen sintered in O_2 was less than that of a specimen sintered in air or Ar, showing that the mobility of O_2 in the material was much higher than that of N_2 or Ar. During prolonged sintering, the density of specimens decreased, while the amount of emitted gas increased. Entrapped gases in the sintered body were concluded to bring about the density decrease during grain growth., The Ceramic Society of Japan
Journal of the Ceramic Society of Japan, 01 Mar. 2000

Analysis of trace amounts of emitted gases during fracture of high-purity alumina under ultrahigh vacuum - Effects of sintering atmosphere and sintering time on gas emission behavior
M Matsumoto; S Kitaoka; H Matsubara; S Kuramoto; M Kanno, The effects of sintering atmosphere and sintering time on gas emission behavior during fracture of high-purity Al2O3 were investigated under ultrahigh vacuum using a mass spectrometer to examine the behavior of gases in the material. The gas in the sintering atmosphere was predominantly emitted at the moment of fracture for all specimens. The total amount of gas emitted from a specimen sintered in O-2 was less than that of a specimen sintered in air or Ar, showing that the mobility of O-2 in the material was much higher than that of N-2 or Ar. During prolonged sintering, the density of specimens decreased, while the amount of emitted gas increased. Entrapped gases in the sintered body were concluded to bring about the density decrease during grain growth., CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, Mar. 2000, [Reviewed]

Effects of residual gas on densification and microstructure development of Al2O3 and ZrO2-8 mol%Y2O3 ceramics sintered in air
Mineaki Matsumoto; Tatsuo Nakajima; Satoshi Kitaoka; Hideaki Matsubara; Sigeru Kuramoto; Motohiro Kanno, Measurements of gas emission during fracture of Al2O3 and ZrO2-8 mol%Y2O3 sintered in air were carried out under ultrahigh vacuum using a mass spectrometer in order to examine the effect of entrapped gas on densification and microstructure development of the materials. Analysis of the spectrometer revealed that nitrogen being introduced from the sintering atmosphere was mainly emitted at the moment of fracture for both materials. During prolonged sintering, the density of Al2O3 tended to decrease and the amount of emitted gas increased. In contrast, the density of ZrO2-8 mol%Y2O3 did not decrease and the emitted gas tended to decrease in the course of sintering. These results of sintering behavior were concluded to result from the difference in nitrogen diffusivity between the materials., Japan Inst of Metals
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 2000, [Reviewed]

Effect of trace impurities on intergranular fracture of aluminum alloys　　　　　　　　　　　　　　　
Shigeru Kuramoto; Keitaro Horikawa; Motohiro Kanno, Effects of trace amounts of embrittling impurities on intergranular fracture were studied using Al-Mg and Al-Cu alloys and mechanisms of intergranular fracture affected by such impurities are discussed. In a coarse-grained Al-5%Mg alloy, 0.5 ppm of sodium was enough to cause severe embrittlement at high temperatures but this detrimental effect was removed by adding antimony or bismuth. Besides sodium, calcium and strontium also promoted intergranular fracture in an Al-5%Mg alloy. Intergranular fracture in Al-4%Cu alloys was evaluated using samples with different precipitate microstructures. The impurity sulfur had a detrimental effect at ambient temperature, while the effect of sulfur disappeared at 77 K., Trans Tech Publ
Materials Science Forum, 2000

LOW-TEMPERATURE TENSILE PROPERTIES OF AL-4.5 PERCENT ZN-1.5 PERCENT MG ALLOYS CONTAINING RECRYSTALLIZATION INHIBITORS
S KURAMOTO; G ITOH; M KANNO, Tensile tests are performed at 77 K and 4.2 K for the Al-4.5%Zn-1.5%Mg (-1%Cu) alloys containing manganese, zirconium or chromium and the effects of these additives on ductility at low temperatures are studied in the microstructural aspects. Such transition elements have low solubility in aluminum and precipitate as dispersoids during ingot preheat. Dispersoids have a strong effect on the process of recovery or recrystallization during solution heat treatment and therefore on the mechanical properties of the final product at room temperature. In the present paper, the alloys containing zirconium or chromium, having unrecrystallized grain structure, exhibit higher ductility at 77 K than the alloy containing manganese, which has completely recrystallized. At 4.2 K, however, no appreciable difference in ductility is found among three additions. This can be explained in terms of localized deformation accompanied by serration that is characteristic of the deformation below about 40 K. Besides the mechanical behavior in parent material, the low temperature tensile properties in welded joints are also examined for these materials., JAPAN INST METALS
JOURNAL OF THE JAPAN INSTITUTE OF METALS, Apr. 1995, [Reviewed]

LOCALIZED DEFORMATION OF ALUMINUM-ALLOYS DURING SERRATED FLOW AT CRYOGENIC TEMPERATURES
S KURAMOTO; M KANNO; G ITOH, Plastic flow localization at the liquid helium temperature has been investigated for Al-Zn-Mg base alloys (7020), which have been applied for cryogenic propellant tankage. As the specific heats of metallic materials decrease with decreasing temperature, a temperature increase produced by plastic work at cryogenic temperatures will be appreciably higher than that produced at room temperature. This temperature rise in the deformed region can make the flow stress significantly lower than otherwise, giving rise to a serrated stress-strain curve at the temperatures below 40 K. In the present work, changes in test piece profiles are studied through the high magnification recording by use of a surface roughness measuring instrument. As a result, each load drop during serrated flow corresponds to a neck formation, which has been observed in ferrous alloys and titanium alloys. It should be noted that necking accompanied by each load drop is outstanding particularly in the specimens with a strong texture that arose from rolling or extruding. In these textured specimens, the sudden rise in temperature allows a great number of grains to deform all at once since the schmid factor of each grain is almost alike. Besides the texture, strain hardening also affects the characteristics of the locallized plasticity. The extruded specimen that has the [111] fiber texture exhibits higher strain hardening rate and higher flow stress level at large strain than other specimens. For this reason, larger local reduction accompanied by each load drop is observed in the cross-sectional area of the extruded specimen., JAPAN INST METALS
JOURNAL OF THE JAPAN INSTITUTE OF METALS, Oct. 1993, [Reviewed]

Mechanical Properties and Deformation Behavior in Severely Cold-Rolled Fe-Ni-Al-C Alloys with Lüders Deformation -Overview with Recent Experimental Results -
Shigeru Kuramoto; Yuta Kawano; Yuwa Mori; Junya Kobayashi; Satoshi Emura; Takahiro Sawaguchi
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, 2025

〔Major achievements〕History of microstructural control and some recent topics aiming strengthening of aluminum alloys
G. Itoh; S. Kuramoto; J. Kobayashi
Journal of the Japan Institute of Light Metals, Dec. 2023, [Reviewed]

Nanoscale analysis of solute distribution in ultrahigh-strength aluminum alloys
E. Kobayashi; M. Ohnuma; S. Kuramoto; J. Kobayashi; G. Itoh
Journal of the Japan Institute of Light Metals, Dec. 2021, [Reviewed]
Corresponding

年間レビュー 力学特性
倉本 繁
軽金属, Aug. 2019, [Reviewed]

圧縮水素容器用アルミニウム合金の湿潤ガス応力腐食割れ試験方法
伊藤吾朗; 倉本 繁; 車田 亮; 小林純也; 浅見重則; 小川武史
圧力技術, Feb. 2019, [Reviewed]

国際会議便り 軽金属に関するアジアフォーラム2018(ALMA Forum 2018)
倉本 繁
軽金属, Jan. 2019, [Reviewed]

Formation behavior of heterogeneous cold deformation structures that give Fe-24wt%Ni-base alloys ultra-high strength and high ductility　　　　　　　　　　　　　　　
Tadahiko Furuta; Izuru Miyazaki; Keiichiro Oh-ishi and Shigeru Kuramoto
R&D Review of Toyota CRDL, Apr. 2018, [Reviewed]
Last

強加工を施した弾性異常Fe‐Ni‐Co‐Ti系合金の結晶相・方位マッピング
波多聰; 白濱順哉; 池田賢一; 中島英治; EDALATI Kaveh; 堀田善治; 古田忠彦; 堀渕嘉代; 倉本繁
日本金属学会講演概要(CD-ROM), 10 Sep. 2014

ω Transformation in cold-worked Ti-Nb-Ta-Zr-O alloys with low body-centered cubic phase stability and its correlation with their elastic properties
M. Tane; T. Nakano; S. Kuramoto; M. Niinomi; N. Takesue; H. Nakajima
Acta Materialia, 01 Jan. 2013

Deformation mechanism and grain refinement behavior in Gum Metal
S. Kumamoto; T. Furuta; N. Nagaasko
Journal of The Japan Institute of Light Metals, 2012, [Reviewed]
Lead

Severe plastic deformation in Gum Metal with composition at structural stability limit
T.Furuta; M.Hara; Z.Horita; S.Kuramoto
International Journal of Materials Research, 2009

Mechanical Properties and Phase Stability of Ti-Nb-Ta-Zr-O Alloys
T. Furuta; S. Kuramoto; J. Hwang; K. Nishino; T. Saito; M. Niinomi
Matr. Trans., 2007

Reply to comments on "Intergranular fracture caused by trace impurities in an Al-5.5 mol% Mg alloy"
K Horikawa; S Kuramoto; M Kanno
SCRIPTA MATERIALIA, Jul. 2002

Intergranular fracture caused by trace impurities in an Al-5.5 mol% Mg alloy
K Horikawa; S Kuramoto; M Kanno
ACTA MATERIALIA, Nov. 2001

High temperature embrittlement caused by trace elements and its suppression by additional elements in an Al-5.5mol%Mg alloy
K Horikawa; S Kuramoto; M Kanno
LIGHT METALS 1999, 1999

High temperature embrittlement caused by traces of calcium or strontium in an Al-5.5mol%Mg alloy
K Horikawa; S Kuramoto; M Kanno
SCRIPTA MATERIALIA, Sep. 1998

Sources of a trace amoutn of sodium, and its effect on hot ductility of an Al-5 mass%Mg alloy
HORIKAWA Keitaro; KURAMOTO Shigeru; KANNO Motohiro
Journal of Japan Institute of Light Metals, Aug. 1998

Intergranular fracture in some precipitation-hardened aluminum alloys at low temperatures
S Kuramoto; G Itoh; M Kanno
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, Oct. 1996

Al-4.4%Zn-1.4%Mg合金の極低温における引張特性に及ぼす銅添加の影響（共著）
伊藤 吾朗; 倉本 繁; 菅野 幹宏
軽金属, 1991

Fundamentals of Titanium and Its Working　　　　　　　　　　　　　　　
Joint work
CORONA PUBLISHING CO., LTD., 05 Nov. 2008

Fe-Ni-Al-C合金の機械的特性および金属組織に及ぼすAlの影響　　　　　　　　　　　　　　　
木村環太、五味直、小金沢魁、倉本繁、小林純也、江村聡、澤口孝宏
日本鉄鋼協会第187回春季講演大会, 14 Mar. 2024
20240313, 20240915

Fe-Cr-Ni-N合金圧延材の室温引張特性に及ぼすNiの影響　　　　　　　　　　　　　　　
小金沢魁、木村環太、五味直、倉本繁、江村聡、澤口孝宏
日本鉄鋼協会第187回春季講演大会, 14 Mar. 2024
20240313, 20240915

Effect of aging conditions on hydrogen release behavior in fractured Al-Cu alloy in humid and dry environments　　　　　　　　　　　　　　　
Y. Ishii; J. Kobayashi; S. Kuramoto; G. Itoh
PRICM11, 22 Nov. 2023
20231119, 20231123

Characterization of the effect of Cu-Mg cluster ,on Al-Cu-Mg alloy hardness　　　　　　　　　　　　　　　
S. Fukuda; M. Ohnuma; J. Kobayashi; G. Itoh; S. Kuramoto; E. Kobayashi
PRICM11, 22 Nov. 2023
20231119, 20231123

アルミニウム合金の内在水素量に及ぼす冷間圧延率と時効処理温度の影響　　　　　　　　　　　　　　　
呉子昴; 石井裕樹; 小林純也; 倉本 繁; 伊藤吾朗
軽金属学会第145回秋期大会, 11 Nov. 2023
20231111, 20231112

Al-Mg-Si 合金鍛造材の湿潤ガス応力腐食亀裂進展に及ぼす組成・加工率の影響　　　　　　　　　　　　　　　
梨木正志; 伊藤吾朗; 倉本 繁; 逢坂崇
軽金属学会第145回秋期大会, 11 Nov. 2023
20231111, 20231112

水素プラズマによるアルミニウム系基板上の水素化物生成に及ぼす基板組成の影響　　　　　　　　　　　　　　　
大内智晴; 湯田浩登; 伊藤吾朗; 佐藤直幸; 倉本 繁; 小林純也
軽金属学会第145回秋期大会, 11 Nov. 2023
20231111, 20231112

β型チタン合金の粒界近傍の力学応答に及ぼす溶体化処理の影響　　　　　　　　　　　　　　　
湯原叡; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第145回秋期大会, 11 Nov. 2023
20231111, 20231112

Al-3.9Cu-1.5Mg 合金の析出強化機構のその場SAXS測定を用いた詳細解析　　　　　　　　　　　　　　　
福田深; 大沼正人; 倉本 繁; 伊藤吾朗; 小林純也; 小林郁夫
軽金属学会第145回秋期大会, 11 Nov. 2023
20231111, 20231112

ベータチタン合金冷間圧延材の引張変形挙動に及ぼすベータ相安定性の影響　　　　　　　　　　　　　　　
入屋紀仁; 湯原叡; 畠山璃子; 倉本 繁
軽金属学会第145回秋期大会, 11 Nov. 2023
20231111, 20231112

Effect of solution treatment temperature on tensile deformation behavior in cold-rolled and aged Al-Cu-Mg alloys　　　　　　　　　　　　　　　
Y. Ishii; J. Kobayashi; E. Kobayashi; M. Ohnuma; S. Kuramoto; G. Itoh
ATEM-iDICs '23, 11 Oct. 2023
20231009, 20231012

TI-Nb系合金の変形挙動に及ぼす溶体化処理と冷間圧延の影響　　　　　　　　　　　　　　　
入屋紀仁、湯原叡、畠山璃子、倉本繁、小林純也
日本鉄鋼協会第186回秋季講演大会, 21 Sep. 2023
20230920, 20230922

Fe-Ni-Al-C合金の機械的特性および金属組織に及ぼす合金組成の影響　　　　　　　　　　　　　　　
木村環太、五味直、小金沢魁、倉本繁、小林純也、江村聡、澤口孝宏
日本鉄鋼協会第186回秋季講演大会, 21 Sep. 2023
20230920, 20230922

Fe-23%Ni-5.0%Al-0.8%C合金冷間圧延材の金属組織および機械的性質　　　　　　　　　　　　　　　
五味直、木村環太、小林純也、倉本繁、江村聡、澤口孝宏
日本鉄鋼協会第186回秋季講演大会, 20 Sep. 2023
20230920, 20230922

Effect of internal hydrogen on mechanical properties and hydrogen embrittlement,sensitivity in cold-rolled Al-Cu-Mg alloys　　　　　　　　　　　　　　　
Z. Wu; Y. Ishii; J. Kobayashi; S. Kuramoto; G. Itoh
ICAA18, 05 Sep. 2023
20230904, 20230908

Effect of aging treatment on tensile properties in cold-rolled Al-Cu-Mg alloys　　　　　　　　　　　　　　　
Y. Ishii; J. Kobayashi; E. Kobayashi; M. Ohnuma; S. Kuramoto; G. Itoh
ICAA18, 05 Sep. 2023
20230904, 20230908

Synthesis of metal hydrides by hydrogen plasma irradiation　　　　　　　　　　　　　　　
T. Ouch; G. Itohi; N. Sato; S. Kuramoto; J. Kobayashi
ICAA18, 05 Sep. 2023
20230904, 20230908

〔Major achievements〕Severely cold worked Fe-Ni-Al-C alloys with ultrahigh strength and prolonged tensile ductility　　　　　　　　　　　　　　　
Shigeru Kuramoto
International Workshop on Superfunctional Energy/Nano Materials (SENM2023), 01 Sep. 2023, [Invited]
20230831, 20230902

ゴムメタルの力学応答に及ぼす溶体化処理条件の影響　　　　　　　　　　　　　　　
入屋紀仁、湯原叡、畠山璃子、倉本繁
”微小領域の力学特性評価とマルチスケールモデリング”2023, 27 Aug. 2023
20230827, 20230828

Al-Cu-Mg 系合金冷間圧延材の引張特性特性に及ぼす溶質濃度の影響　　　　　　　　　　　　　　　
石井裕樹; 小林純也; 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第144回春期大会, 13 May 2023
20230513, 20230514

Al-Mg-Si 系合金の湿潤ガス応力腐食割れ特性に及ぼす組成とプロセス条件の影響　　　　　　　　　　　　　　　
梨木正志; 伊藤吾朗; 倉本 繁; 逢坂崇
軽金属学会第144回春期大会, 13 May 2023
20230513, 20230514

Al-Zn-Mg-Cu 合金の水素脆化粒界破面観察　　　　　　　　　　　　　　　
永井竜太; 伊藤吾朗; 井誠一郎; 倉本 繁; 小林純也
軽金属学会第144回春期大会, 13 May 2023
20230513, 20230514

Al-Cu-Mg 系合金冷間加工材の機械的特性に及ぼす水素量の影響　　　　　　　　　　　　　　　
呉子昴; 石井裕樹; 小林純也; 倉本 繁; 伊藤吾朗
軽金属学会第144回春期大会, 13 May 2023
20230513, 20230514

β型チタン合金の粒界近傍の力学応答に及ぼす溶体化処理の影響　　　　　　　　　　　　　　　
湯原叡; 石嵜直樹; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第144回春期大会, 13 May 2023
20230513, 20230514

β型チタン合金の粒界近傍における局所的変形領域の組織観察　　　　　　　　　　　　　　　
石嵜直樹; 湯原 叡; 倉本 繁; 仲川枝里; 大村孝仁; 岩本知広
軽金属学会第143回秋期大会, 13 Nov. 2022
20221112, 20221113

強加工された二元系マグネシ ウム合金の機械的特性に及ぼす粒径と結晶方位の影響　　　　　　　　　　　　　　　
八木航; 染川英俊; 土谷浩一; 倉本 繁
軽金属学会第143回秋期大会, 13 Nov. 2022
20221112, 20221113

強加工した難燃性マグネシウム合金の引張変形挙動に及ぼす結晶方位の影響　　　　　　　　　　　　　　　
津久井大地; 松田寛太郎; 倉本 繁; 行武栄太郎; 伊藤友美; 野田雅史; 染川英俊; 土谷浩一
軽金属学会第143回秋期大会, 13 Nov. 2022
20221112, 20221113

Al-Cu-Mg系合金冷間圧延材の不均一変形挙動に及ぼすひずみ速度の影響　　　　　　　　　　　　　　　
石井裕樹; 小林純也; 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第143回秋期大会, 13 Nov. 2022
20221112, 20221113

6110アルミニウム合金の湿潤ガス応力腐食割れ特性　　　　　　　　　　　　　　　
梨木正志; 伊藤吾朗; 倉本 繁; 逢坂崇
軽金属学会第143回秋期大会, 13 Nov. 2022
20221112, 20221113

時効処理したAl-Cu-Mg系合金冷間圧延材の引張特性に及ぼす水素量の影響　　　　　　　　　　　　　　　
呉子昂; 石井裕樹; 小林純也; 倉本 繁; 伊藤吾朗
軽金属学会第143回秋期大会, 13 Nov. 2022
20221112, 20221113

Al-Mg-Si 系合金冷間圧延材の機械的特性に及ぼす内在水素量の影響　　　　　　　　　　　　　　　
福澤宏基; 石井裕樹; 小林純也; 倉本 繁; 伊藤吾朗
軽金属学会第143回秋期大会, 13 Nov. 2022
20221112, 20221113

溶体化処理炉・圧延機と隣接させたX線小角散乱によるAl-Zn-Mg合金およびAl-Cu-Mg合金の微細組織定量評価　　　　　　　　　　　　　　　
大沼正人; 福田深; 鈴木朝己; 倉本 繁; 伊藤吾朗; 小林郁夫; 小林純也
軽金属学会第143回秋期大会, 12 Nov. 2022
20221112, 20221113

X線小角散乱と示差走査熱分析を用いたAl-4Cu-1.5Mg合金の人工時効過程のその場解析　　　　　　　　　　　　　　　
福田深; 大沼正人; 倉本 繁; 伊藤吾朗; 小林郁夫; 小林純也
軽金属学会第143回秋期大会, 12 Nov. 2022
20221112, 20221113

水素プラズマによるアルミニウム水素化物生成に及ぼすプラズマ照射条件の影響　　　　　　　　　　　　　　　
大内智晴; 伊藤吾朗; 佐藤直幸; 倉本 繁; 小林純也
軽金属学会第143回秋期大会, 12 Nov. 2022
20221112, 20221113

β型チタン合金のポップイン挙動に及ぼす粒界方位差の影響　　　　　　　　　　　　　　　
湯原 叡; 石嵜直樹; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第143回秋期大会, 12 Nov. 2022
20221112, 20221113

β型チタン合金の引張変形挙動に及ぼす溶体化処理条件の影響　　　　　　　　　　　　　　　
入屋紀仁; 石嵜直樹; 湯原 叡; 倉本 繁
軽金属学会第143回秋期大会, 12 Nov. 2022
20221112, 20221113

アルミニウム合金の高強度化に関する組織制御の歴史と最近のトピックス　　　　　　　　　　　　　　　
伊藤吾朗; 倉本 繁; 小林純也
軽金属学会第143回秋期大会, 12 Nov. 2022
20221112, 20221113

Fe-Ni-Al-C 系合金の機械的特性および金属組織に及ぼす熱処理温度の影響　　　　　　　　　　　　　　　
五味直・小林純也・倉本繁・江村聡・澤口孝宏
鉄鋼協会第184回秋季講演大会, 22 Sep. 2022
20220921, 20220923

熱間圧延を施した TBF 鋼の耐水素脆化特性に及ぼす低速引張試験におけるひずみ速度と圧下率の影響　　　　　　　　　　　　　　　
工藤瞬・木村太一・小林純也・北條智彦・倉本繁・伊藤吾朗
鉄鋼協会第184回秋季講演大会, 22 Sep. 2022
20220921, 20220923

熱間圧延を施した TBF 鋼板の変形特性に及ぼす微細組織の影響　　　　　　　　　　　　　　　
木村太一・工藤瞬・小林純也・北條智彦・倉本繁・伊藤吾朗
鉄鋼協会第184回秋季講演大会, 22 Sep. 2022
20220921, 20220923

難燃性マグネシウム合金の画像相関法による引張変 形挙動の解析　　　　　　　　　　　　　　　
松田 貫太郎(茨城大); 津久井 大地(茨城大); 倉本 繁 (茨城大); 染川 英俊(物材機構); 土谷 浩一(物材機構); 行武 栄太郎(茨城県産業技術イノベーションセンター); 野田 雅史(権田金属); 伊藤 友美(権田金属)
日本機械学会第30回茨城講演会, 19 Aug. 2022
20220819, 20220819

Al-Zn-Mg-Cu 系合金の粒界析出物の整合性と水素脆化 粒界割れ経路の関係　　　　　　　　　　　　　　　
永井 竜太(茨城大); 伊藤 吾朗(茨城大); 倉本 繁(茨 城大); 小林 純也(茨城大)
日本機械学会第30回茨城講演会, 19 Aug. 2022
20220819, 20220819

ゴムメタルの引張変形挙動に及ぼす溶体化処理の影 響　　　　　　　　　　　　　　　
入屋 紀仁(茨城大); 石嵜 直樹(茨城大); 湯原 叡(茨 城大); 倉本 繁(茨城大)
日本機械学会第30回茨城講演会, 19 Aug. 2022
20220819, 20220819

TRIP 型ベイニティックフェライト鋼板の諸特性に及ぼす加工熱処理の影響　　　　　　　　　　　　　　　
深作 隼也(茨城大); 小島 元太(茨城大); 小林 純也 (茨城大); 倉本 繁(茨城大); 北條 智彦(東北大); 伊藤 吾朗(茨城大)
日本機械学会第30回茨城講演会, 19 Aug. 2022
20220819, 20220819

等温保持処理直前に圧延を施した低合金 TRIP 鋼の温間引張特性　　　　　　　　　　　　　　　
服部 克海(茨城大); 小島 元太(茨城大); 小林 純也 (茨城大); 倉本 繁(茨城大); 北條 智彦(東北大); 伊藤 吾朗(茨城大)
日本機械学会第30回茨城講演会, 19 Aug. 2022
20220819, 20220819

Fe-Ni-Al-C 系合金の機械的特性および金属組織に及 ぼす合金組成の影響　　　　　　　　　　　　　　　
木村 環太(茨城大); 五味 直(茨城大); 倉本 繁(茨城 大); 江村 聡(NIMS); 澤口 孝宏(NIMS)
日本機械学会第30回茨城講演会, 19 Aug. 2022
20220819, 20220819

熱間圧延を施した TRIP 型ベイニティックフェライト 鋼の成形性　　　　　　　　　　　　　　　
Azhar Mohamad Ridha(茨城大); 木村 太一(茨城大); 工藤 瞬(茨城大); 小林 純也(茨城大); 倉本 繁(茨城大); 北條 智彦(東北大); 伊藤 吾朗(茨城大)
日本機械学会第30回茨城講演会, 19 Aug. 2022
20220819, 20220819

プレデカップリング効果を用いた短パルス型 MW 中性子源用ボロン系熱中性子吸収材の開発　　　　　　　　　　　　　　　
奥冨 敏文(茨城大); 勅使河原 誠(原子力機構); 原田 正英(原子力機構); 大井 元貴(原子力機構); 倉本 繁(茨 城大)
日本機械学会第30回茨城講演会, 19 Aug. 2022
20220819, 20220819

Mg-Al-Zn-Ca系合金の引張変形挙動の画像相関法による解析　　　　　　　　　　　　　　　
津久井大地,高須飛雅; 倉本 繁,行武栄太郎,伊藤友美,野田雅史; 染川英俊; 土谷浩一
軽金属学会第142回春期大会, 28 May 2022
20220528, 20220528

水素プラズマ照射したAl-Ti合金およびアルミニウムにおける金属水素化物生成　　　　　　　　　　　　　　　
大内智晴; 伊藤吾朗; 佐藤直幸; 倉本 繁; 小林純也
軽金属学会第142回春期大会, 28 May 2022
20220528, 20220528

冷間加工したβ型チタン合金における粒界近傍の局所力学挙動に及ぼす相安定性の影響　　　　　　　　　　　　　　　
石嵜直樹; 湯原叡; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第142回春期大会, 28 May 2022
20220528, 20220528

β型チタン合金のナノインデンテーションにおける力学応答に及ぼす粒界方位差と相安定性の影響　　　　　　　　　　　　　　　
湯原叡; 石嵜直樹; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第142回春期大会, 28 May 2022
20220528, 20220528

Al-Cu-Mg系合金冷間圧延材の引張特性に及ぼす低温時効の影響　　　　　　　　　　　　　　　
石井裕樹; 小林純也; 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第142回春期大会, 28 May 2022
20220528, 20220528

Al-Mg-Si 系合金冷間圧延材の引張変形挙動に及ぼす時効処理の影響　　　　　　　　　　　　　　　
福澤宏基; 石井裕樹; 小林純也; 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第142回春期大会, 28 May 2022
20220528, 20220528

Al-Cu-Mg系合金冷間圧延材の引張特性に及ぼす内在水素量の影響　　　　　　　　　　　　　　　
呉子昂; 石井裕樹; 小林純也; 倉本 繁; 伊藤吾朗
軽金属学会第142回春期大会, 28 May 2022
20220528, 20220528

6000 系アルミニウム合金 T6 処理材と強加工材の時効析出挙動と HRTEM 観察組織の比較　　　　　　　　　　　　　　　
喜連川直人; オミンホ; 小林純也; 大沼正人; 倉本 繁; 伊藤吾朗; 小林郁夫
軽金属学会第140回春期大会, 15 May 2021
20210515, 20220515

軽金属材料の高強度化のための合金設計　　　　　　　　　　　　　　　
倉本 繁
軽金属学会第140回春期大会, 15 May 2021, [Invited]
20210515, 20220515

熱間圧延を施したTRIP型ベイニティックフェライト鋼の耐水素脆化特性に及ぼす残留γの影響　　　　　　　　　　　　　　　
工藤瞬・木村太一・小林純也・倉本繁・伊藤吾朗・北條智彦
鉄鋼協会第183回春季講演大会, Mar. 2022
20220315, 20220317

熱間圧延TRIP型ベイニティックフェライト鋼の機械的特性に及ぼす残留オーステナイト形態の影響　　　　　　　　　　　　　　　
木村太一・工藤瞬・小林純也・倉本繁・伊藤吾朗・北條智彦
鉄鋼協会第183回春季講演大会, Mar. 2022
20220315, 20220317

Al-Mg-Si 系合金冷間圧延材の機械的特性に及ぼす時効処理の影響　　　　　　　　　　　　　　　
福澤宏基; 石井裕樹; 小林純也 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

強加工したマグネシウム合金の強度特性に及ぼす結晶粒径の影響　　　　　　　　　　　　　　　
八木航; 倉本 繁; 染川英俊; 土谷浩一
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

Mg-Al-Zn-Ca 系合金 HPT 加工材の機械的特性に及ぼす熱処理条件の影響　　　　　　　　　　　　　　　
高須飛雅; 津久井大地; 倉本 繁; 行武栄太郎; 伊藤友美; 野田雅史; 染川英俊; 土谷浩一
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

90 %冷間圧延した Al-4Cu-3Mg 合金の時効硬化挙動と析出物　　　　　　　　　　　　　　　
冨田友稀; オミンホ; 小林純也; 大沼正人; 倉本 繁; 伊藤吾朗; 小林郁夫
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

Ti-Nb-Ta-Zr-O 合金冷間圧延材の機械的特性に及ぼす溶体化処理条件の影響　　　　　　　　　　　　　　　
朴俊傑; 倉本 繁
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

Al-Cu-Mg 合金の耐水素脆化特性と粒界析出組織の関係　　　　　　　　　　　　　　　
川崎翔平; 伊藤吾朗; 車田亮; 真中俊明; 小林純也; 倉本 繁
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

β型チタン合金の局所力学挙動に及ぼす粒界性格と相安定性の影響　　　　　　　　　　　　　　　
石嵜直樹; 湯原叡; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

7000 系アルミニウム合金押出材における疲労負荷によるミクロ組織変化　　　　　　　　　　　　　　　
近藤大輝; 伊藤吾朗; 小林純也; 倉本 繁; 車田亮
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

Al-Cu-Mg 系合金冷間圧延材の引張特性に及ぼす時効処理の影響　　　　　　　　　　　　　　　
石井裕樹; 小林純也 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

Al-Zn-Mg-Cu 系合金冷間圧延材の 変形挙動の DIC による評価　　　　　　　　　　　　　　　
横田慎介; 小林純也 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第141回秋期大会, 13 Nov. 2021
20211113, 20211113

Fe-Ni-Al-C系合金の不均一変形挙動と組織に及ぼす冷間圧延の影響　　　　　　　　　　　　　　　
河野悠太・森柚和・小林純也・倉本繁・江村聡・澤口孝宏
鉄鋼協会第182回秋季講演大会, Sep. 2021
20210902, 20210904

Fe-Ni-Al-C系合金の引張変形中の組織に及ぼす合金組成の影響　　　　　　　　　　　　　　　
森柚和・河野悠太・小林純也・倉本繁・江村聡・澤口孝宏
鉄鋼協会第182回秋季講演大会, Sep. 2021
20210902, 20210904

難燃性マグネシウム合金の機械的特性に及ぼす HPT 加工の影響　　　　　　　　　　　　　　　
津久井 大地(茨城大); 高須 飛雅(茨城大); 倉本 繫(茨城 大); 土谷 浩一(NIMS); 染川 英俊(NIMS); 行武 栄太郎(茨城県産業技術イノベーションセンター); 野田 雅史(権田金属); 伊藤 友美(権田金属)
日本機械学会第29回茨城講演会, Aug. 2021
20210819, 20210819

スピニング加工を施した SS400 の微細組織と硬さ特性　　　　　　　　　　　　　　　
金野 凌(茨城大); 小林 功典(茨城大); 小林 純也(茨城大); 倉本 繁(茨城大); 伊藤 吾朗(茨城大); 林 正文(日本鏡板工 業); 今村 貴康(日本鏡板工業); 折田 圭史(日本鏡板工業)
日本機械学会第29回茨城講演会, Aug. 2021
20210819, 20210819

β型チタン合金における結晶粒界近傍の変形挙動に及ぼす相安定性の影響　　　　　　　　　　　　　　　
湯原 叡(茨城大); 石嵜 直樹(茨城大); 倉本 繫(茨城大); 仲川 枝里(NIMS); 大村 孝仁(NIMS)
日本機械学会第29回茨城講演会, Aug. 2021
20210819, 20210819

Fe-Ni-Al-C 系合金の機械的特性および金属組織に及ぼす熱処 理温度の影響　　　　　　　　　　　　　　　
五味 直(茨城大); 森 柚和(茨城大); 河野 悠太(茨城大); 小林 純也(茨城大); 倉本 繁(茨城大); 江村 聡(NIMS); 澤口 孝宏(NIMS)
日本機械学会第29回茨城講演会, Aug. 2021
20210819, 20210819

温間圧延と等温保持により作製した TRIP 型マルテンサイト 鋼のビッカース硬さと微細組織　　　　　　　　　　　　　　　
小島 元太(茨城大); 木村 太一(茨城大); 工藤 瞬(茨城大); 小林 純也(茨城大); 倉本 繁(茨城大); 伊藤 吾朗(茨城大); 北條 智彦(東北大)
日本機械学会第29回茨城講演会, Aug. 2021
20210819, 20210819

強加工したマグネシウム合金の強度特性に及ぼす合金元素の影響　　　　　　　　　　　　　　　
八木航; 倉本 繁; 染川英俊; 土谷浩一
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

ラボ X 線小角散乱法による 2000 系アルミニウム合金時効過程のスローオペランド解析　　　　　　　　　　　　　　　
田中俊伎; 林恭平; 大沼正人; 倉本 繁; 伊藤吾朗; 小林純也; 小林郁夫
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

中性子小角散乱(SANS)/X 線小角散乱(SAXS)強度比較による 7000 系 アルミニウム時効初期過程の検討　　　　　　　　　　　　　　　
林恭平; 田中俊伎; 大沼正人; 倉本 繁; 伊藤吾朗; 小林純也; 小林郁夫
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

β型チタン合金における結晶粒界近傍の局所力学挙動　　　　　　　　　　　　　　　
石嵜直樹; 沼田和也; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

90%冷間圧延を施した Al-xZn-2Mg(x=4.5, 5.5, 8)合金の時効析出挙動のTEM 観察　　　　　　　　　　　　　　　
李有眞; オミンホ; 小林純也; 大沼正人; 倉本 繁; 伊藤吾朗; 小林郁夫
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

Al-Cu-Mg 系合金冷間圧延材の機械的特性と水素脆化特性に及ぼす溶体化処理温度の影響　　　　　　　　　　　　　　　
石井裕樹; 小林純也 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

液体金属脆性を利用して調査した析出強化型アルミニウム合金の粒界析出組織評価　　　　　　　　　　　　　　　
川崎翔平; 檜山佳祐; 伊藤吾朗; 真中俊明; 小林純也 倉本 繁
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

Mg-Al-Zn-Ca 系合金の機械的特性に及ぼす強加工の影響　　　　　　　　　　　　　　　
高須飛雅; 木村健太郎; 倉本 繁; 行武栄太郎; 伊藤友美; 野田雅史; 染川英俊; 土谷浩一
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

Al-4.5%Zn-2.0%Mg-2.5%Cu 合金 90%冷間圧延材の引張特性に及ぼす時効の影響　　　　　　　　　　　　　　　
横田慎介; 小林純也 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

Ti-Nb-Ta-Zr-O 合金の機械的特性に及ぼす熱処理条件の影響　　　　　　　　　　　　　　　
朴俊傑; 米村柊輝; 倉本 繁
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

Al-Mg-Si 系合金冷間圧延材の機械的特性と水素脆化特性に及ぼす添加元素の影響　　　　　　　　　　　　　　　
福澤宏基; 石井裕樹; 小林純也 小林郁夫; 大沼正人; 倉本 繁; 伊藤吾朗
軽金属学会第140回春期大会, 15 May 2021
20210515, 20210515

Fe-Ni-Al-C系合金の機械的特性および変形挙動に及ぼすNi、C量の影響　　　　　　　　　　　　　　　
森柚和・河野悠太・小林純也・倉本繁・江村聡・澤口孝宏
鉄鋼協会第181回春季講演大会, Mar. 2021
20210317, 20210319

Fe-Ni-Al-C系合金の機械的特性と不均一変形挙動に及ぼすAl量と冷間圧延の影響　　　　　　　　　　　　　　　
河野悠太・森柚和・小林純也・倉本繁・江村聡・澤口孝宏
鉄鋼協会第181回春季講演大会, Mar. 2021
20210317, 20210319

ナノインデンテーションによるTi- Nb系合金の局所変形挙動解析　　　　　　　　　　　　　　　
茨城大 米村柊輝・ 倉本 繁 NIMS 仲川枝理 NIMS; 九州大 大村孝仁
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

β型チタン合金におけるナノイン デンテーション中の変形抵抗に 及ぼす冷間加工の影響　　　　　　　　　　　　　　　
茨城 大 沼田和也・米村 柊輝・倉本 繁 NIMS 仲川枝 里 NIMS; 九州大 大村孝仁
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

Mg-Al-Zn合金摩擦攪拌材の機 械的特性に及ぼすプロセス条件の影響　　　　　　　　　　　　　　　
茨城大 網代康 祐・八木 航・倉本 繁 茨城県産イ 行武栄太郎
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

Al-Cu-Mg系合金冷間圧延材の機械的特性と水素脆化特性に及ぼす合金組成の影響　　　　　　　　　　　　　　　
茨城大 石井裕樹・小林純也・ 倉本 繁・伊藤吾朗
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

腐食疲労を予負荷した7000系アルミニウム合金の引張破壊様相とミクロ組織との関係　　　　　　　　　　　　　　　
茨城大 近藤大輝・伊藤吾朗 本田技研工業 髙木 直 茨城大 小林純也・倉本 繁・車田 亮
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

Al-Zn-Mg-Cu系合金冷間圧延材の引張特性及び耐水素脆性に及ぼす熱処理の影響　　　　　　　　　　　　　　　
茨城大 横田慎介・小林純也・ 倉本 繁・伊藤吾朗
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

焼入れ条件制御したAl-Zn-Mg-Cu合金の耐水素脆化特性におけるミクロ組織要因　　　　　　　　　　　　　　　
茨城大 檜山佳祐・川﨑翔 平・伊藤吾朗・小林純也・倉本 繁・車田 亮
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

Mg-Al-Zn-Ca系合金摩擦攪拌処理材の結晶粒径に及ぼす工具挿入量の影響　　　　　　　　　　　　　　　
茨城大 高須飛雅・木村健太 郎・倉本 繁 茨城県産イ 行武栄太郎 権田金属 伊藤友美・野田雅史
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

Mg-Al-Zn-Ca系合金MIG溶接材の耐水素脆化特性評価　　　　　　　　　　　　　　　
茨城大 岡﨑祐季・関陽二郎・伊藤吾朗 木ノ本伸線 上田光二 茨城大 倉本 繁・小林純也
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

液体金属脆性を利用して調査したAl-Mg-Si系合金の粒界析出組織に及ぼす合金組成の影響　　　　　　　　　　　　　　　
茨城大 木内智也・川崎翔平・伊藤吾朗・小林純也・倉本 繁
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

液体金属脆性を利用した観察によるAl-Zn-Mg-Cu合金の粒界析出制御の検証　　　　　　　　　　　　　　　
茨城大 川崎翔平・檜山 佳祐・木内智也・車田 亮・伊藤吾朗・小林純也・倉本 繁
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

ひずみ誘起粒界移動の応用による高強度アルミニウム合金の粒界割れ抑制　　　　　　　　　　　　　　　
茨城大 呂 波帆・檜山佳 祐・伊藤吾朗・小林純也・倉本 繁・車田 亮
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

Mg-8%Al-1%Zn-1%Ca合金の耐水素脆化特性に及ぼす熱処理の影響　　　　　　　　　　　　　　　
茨城大 関陽二郎・岡﨑祐季・伊藤吾朗・倉本 繁・小林純也
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

Mg-Al-Zn-Ca系合金摩擦攪拌処理材の機械的特性に及ぼすプロセス条件の影響　　　　　　　　　　　　　　　
茨城大 木村健太郎・高須飛雅・倉本 繁 茨城県産イ 行武栄太郎 権田金属 伊藤友美・野田雅史
軽金属学会第139回秋期大会, Nov. 2020
20201107, 20201108

高強度Fe-Ni-Al-C系合金の水素脆化挙動に及ぼす熱処理の影響　　　　　　　　　　　　　　　
佐藤智弥・倉本繁・小林純也
鉄鋼協会第180回秋季講演大会, Sep. 2020
20200916, 20200918

Fe-Ni-Al-C系合金の水素脆化挙動に及ぼす冷間圧延の影響　　　　　　　　　　　　　　　
河野悠太・倉本繁・小林純也
鉄鋼協会第180回秋季講演大会, Sep. 2020
20200916, 20200918

高強度Fe-Ni-Al-C系合金の機械的特性に及ぼす合金組成および金属組織の影響　　　　　　　　　　　　　　　
森柚和・倉本繁・小林純也
鉄鋼協会第180回秋季講演大会, Sep. 2020
20200916, 20200918

高強度Fe-Ni-Al-C系合金の耐水素脆性に及ぼす熱処理の影響　　　　　　　　　　　　　　　
佐藤智弥・倉本繁・小林純也・天羽玄
鉄鋼協会第179回春季講演大会, Mar. 2020
20200317, 20200319

6000系アルミニウム合金の過負荷条件における耐湿潤ガス応 力腐食割れ特性に及ぼす不純物Feの影響　　　　　　　　　　　　　　　
杢家弘樹; 伊藤吾朗; 車田 亮; 倉本 繁; 小林純也
軽金属学会第137秋期大会, Nov. 2019

5083アルミニウム合金の耐環境脆化特性に及ぼす鋭敏化処理 条件の影響　　　　　　　　　　　　　　　
大渕知之; 伊藤吾朗; Alireza GHORANI; 小林純也; 倉本 繁
軽金属学会第137秋期大会, Nov. 2019

ラボX線小角およびインハウス中性子小角散乱によるバルク状 アルミニウム合金のナノ組織非破壊評価　　　　　　　　　　　　　　　
大沼 正人; 林 恭平; 平賀富士夫; 原かおる; 倉 本 繁
軽金属学会第137回秋期大会, Nov. 2019

Mg-Al-Zn-Ca系合金圧延材の湿潤環境下における脆化挙動　　　　　　　　　　　　　　　
佐野亮太; 伊藤吾朗; 倉本 繁; 小林純 也; 伊藤友美; 野田雅史
軽金属学会第137回秋期大会, Nov. 2019

Mg-3%Al-1%Zn合金摩擦攪拌材の機械的特性に及ぼすひず み速度の影響　　　　　　　　　　　　　　　
小澤真行; 倉本 繁; 行武栄太郎
軽金属学会台137回秋期大会, Nov. 2019

Ti-18Mo合金の局所的力学挙動の解析　　　　　　　　　　　　　　　
木村 拓也; 米村柊輝; 沼田和也; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第137回秋期大会, Nov. 2019

液体ガリウムを利用したAl-Mg-Si系合金の粒界析出組織評価　　　　　　　　　　　　　　　
木内智也; 川崎翔平; 伊藤吾朗; 小 林純也; 倉本 繁
軽金属学会第137回秋期大会, Nov. 2019

焼入れ条件制御したAl-Zn-Mg-Cu合金板材の耐 SCC性に及ぼす粒界析出組織の影響　　　　　　　　　　　　　　　
檜山佳祐; 伊藤吾朗; 倉本 繁
軽金属学会第137回秋期大会, Nov. 2019

Mg-Al-Zn合金摩擦攪拌材の機械的特性に及ぼ す加工条件の影響　　　　　　　　　　　　　　　
網代康祐; 小澤直行; 倉本 繁; 行武栄太郎
軽金属学会第137回秋期大会, Nov. 2019

Al-Mg-Si系合金冷間圧延材の機械的特性に及ぼす合金組成の影響　　　　　　　　　　　　　　　
三浦琢 真; 倉本 繁; 伊藤吾朗; 小林純也
軽金属学会第137回秋期大会, Nov. 2019

Mg-Al-Zn-Ca系合金MIG溶接材における局所的耐湿潤ガス応力腐食割れ特性評価　　　　　　　　　　　　　　　
岡崎祐季; 関陽二郎; 佐野亮太; 伊藤吾朗; 車田 亮; 倉本 繁; 小林純也; 伊藤友美; 野田雅史; 上田光二
軽金属学会第137回秋期大会, Nov. 2019

Ti-Nb系合金の局所的力学応答に及ぼすNb含有量の影響　　　　　　　　　　　　　　　
米村柊輝; 木村 拓也; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第137回秋期大会, Nov. 2019

Mg-Al-Zn-Ca合金MIG溶接材の低ひずみ速度法引張試験による耐水素脆化特性評価　　　　　　　　　　　　　　　
橋本拳志; 伊藤吾朗; 倉本 繁; 小林 純也; 伊藤友美; 野田雅史; 上田光二
軽金属学会第137回秋期大会, Nov. 2019

Mg‐Al‐Zn‐Ca系合金の機械的特性に及ぼす摩擦撹拌処理加工温度の影響　　　　　　　　　　　　　　　
木 村健太郎; 高須飛雅; 倉本 繁; 行武栄太郎; 伊藤友美; 野田雅史
軽金属学会第137回秋期大会, Nov. 2019

冷間加工したTi-Nb系合金の局所的力学応答に及ぼす溶体化処理温度の影響　　　　　　　　　　　　　　　
沼田和也; 木村拓也; 倉本 繁; 仲川枝里; 大村孝仁
軽金属学会第137回秋期大会, Nov. 2019

Mg-Al-Zn-Ca系合金の耐湿潤ガス応力腐食割れ特性における第二相粒子分布の影響　　　　　　　　　　　　　　　
関陽二郎; 岡﨑祐季; 佐野亮 太; 伊藤吾朗; 車田 亮; 倉本 繁; 小林純 也; 伊藤友美; 野田雅史
軽金属学会第137回秋期大会, Nov. 2019

Effect of cold working on local mechanical response of Gum Metal　　　　　　　　　　　　　　　
Y. Shibayama; K. Onose; S. Kuramoto; T. Suzuki; E. Nakagawa; T. Omura
131st meeting of Japan Institute of Light Metals, 05 Nov. 2016

Influence of grain size on strength of Mg-Al-Zn base alloy　　　　　　　　　　　　　　　
Y. Sakaoka; T. Sudo; S. Kuramoto; A. Kurumada
131st meeting of Japan Institute of Light Metals, 05 Nov. 2016

Microstructure change of severe cold rolled 7075 aluminum alloy during aging　　　　　　　　　　　　　　　
M. Hotta; E. Kobayashi; S. Kuramoto; G. Itoh
131st meeting of Japan Institute of Light Metals, 05 Nov. 2016

Effects of quenching temperature on strength of cold-rolled Al-Zn-Mg alloy　　　　　　　　　　　　　　　
Y. Nakajima; S. Kuramoto; I. Aoi; Y. Shimizu
131st meeting of Japan Institute of Light Metals, 05 Nov. 2016

Deformation mechanism analysis of Gum Metal by nanoindentation　　　　　　　　　　　　　　　
K. Onose; Y. Shibayama; S. Kuramoto; T. Suzuki; E. Nakagawa; T. Omura
131st meeting of Japan Institute of Light Metals, 05 Nov. 2016

Effect of test environment on tensile properties of cold-rolled Al-Zn-Mg alloy　　　　　　　　　　　　　　　
Y. Nakajima; S. Kuramoto
130th meeting of Japan Institute of Light Metals, 28 May 2016

Effect of strain rate on strength of Gum Metal　　　　　　　　　　　　　　　
K. Onose; Y. Shibayama; S. Kuramoto; T. Suzuki; E. Nakagawa; T. Omura
130th meeting of Japan Institute of Light Metals, 28 May 2016

Analysis of inhomogeneous deformation behavior of Gum Metal by Nanoindentation　　　　　　　　　　　　　　　
Y. Shibayama; K. Onose; S. Kuramoto; T. Suzuki; E. Nakagawa; T. Omura
130th meeting of Japan Institute of Light Metals, 28 May 2016

Effect of grain size on strength of Mg-Al-Zn base alloy　　　　　　　　　　　　　　　
Y. Sakaoka; S. Kuramoto
130th meeting of Japan Institute of Light Metals, 28 May 2016

A7075 圧延材における粗大化析出物の数密度と加工量の関係　　　　　　　　　　　　　　　
田本洋高; 大沼正人; 倉本繁
日本金属学会春期講演大会, Mar. 2016

Strengthening of hot-rolled Al-8%Zn-2%Mg-2%Cu alloy after HPT processing　　　　　　　　　　　　　　　
I. Aoi; K. Oh-ishi; Y. Shimizu; S. Kuramoto
129th meeting of Japan Institute of Light Metals, 21 Nov. 2015

高強度・高延性を有する Fe-Ni-Al-C 合金冷間圧延材の引張変形その場中性子線解析　　　　　　　　　　　　　　　
小森俊輝; 柴田曉伸; 古田忠彦; 倉本繁; 友田陽; S. Harjo; 辻伸泰
日本金属学会秋期講演大会, Sep. 2015

高強度・高延性を有するFe-Ni-Al-C 合金冷間圧延材の引張変形挙動　　　　　　　　　　　　　　　
小森俊輝; 柴田曉伸; 辻伸泰; 古田忠彦; 倉本繁; 友田陽; S. Harjo
日本金属学会春期講演大会, Mar. 2015

A7075 アルミニウム合金およびAl-Mg 合金の圧延加工による高強度化　　　　　　　　　　　　　　　
清水吉広; 伊東一彦; 青井一郎; 倉本繁
日本金属学会春期講演大会, Mar. 2015

3DAP analysis of microstructure of 7075 Al alloy processed by HPT　　　　　　　　　　　　　　　
K. Oh-ishi; I. Aoi; S. Kuramoto; K. Hono
127th meeting of Japan Institute of Light Metals, 15 Nov. 2014

Effect of pre-process conditions on mechanical properties of HPT-processed Al-Zn-Mg base alloy　　　　　　　　　　　　　　　
I. Aoi; S. Kuramoto; K. Oh-ishi
127th meeting of Japan Institute of Light Metals, 15 Nov. 2014

Strengthening the Alloys with Elastic Softening in Shear Modulus C’　　　　　　　　　　　　　　　
S. Kuramoto; T. Furuta; N. Nagasako; Z. Horita
ICOMAT-2011 (International Conference on Martensitic Transformations), 2011, [Invited]

Strengthening of the Alloys with Elastic Anisotropy by Severe Plastic Deformation　　　　　　　　　　　　　　　
S. Kuramoto; T. Furuta; N. Nagasako; Z. Horita
THERMEC'2011 (International Conference on Processing & Manufacturing of Advanced Materials), 2011, [Invited]

Development of Multifunctional Alloy “Gum Metal” and Its Industrial Application　　　　　　　　　　　　　　　
S. Kuramoto
2009 Japan-America Frontiers of Engineering, 2009, 全米・日本工学アカデミー、科学技術振興機構共催, [Invited]

2015, The Japan Society of Mechanical Engineers

2005, TMS

1998, The Iron and Steel Institute of Japan

1989, The Japan Institute of Light Metals

1989, The Japan Institute of Metals and Materials

超音波誘起格子欠陥の成因解明と制御　　　　　　　　　　　　　　　
Grant-in-Aid for Scientific Research (B)
Apr. 2021 - Mar. 2025

マルテンサイト変態を利用した鉄鋼材料の局所変形能制御　　　　　　　　　　　　　　　
NIMS連携拠点推進制度
Apr. 2020 - Mar. 2024

〔Major achievements〕塑性加工による高強度高延性Fe-Ni-Al-C系合金の特性制御　　　　　　　　　　　　　　　
研究助成
Apr. 2022 - Mar. 2023

Analysis on the sites of existence and paths of migration for hydrogen in metallic materials for structural use by means of some visualization techniques　　　　　　　　　　　　　　　
Grant-in-Aid for Scientific Research (C)
Apr. 2020 - Mar. 2023

粒界抵抗とすべり異方性を制御した高強度Mg合金　　　　　　　　　　　　　　　
NIMS連携拠点推進制度
Apr. 2020 - Mar. 2023

〔Major achievements〕Nanoscale analysis of solute distribution in ultrahigh-strength aluminum alloys　　　　　　　　　　　　　　　
統合的先端研究
Apr. 2019 - Mar. 2021

Suppression of environmental embrittlement in cold worked aluminum alloys with deformation-induced nano clustersPrincipal InvestigatorOngoing　　　　　　　　　　　　　　　
Grant-in-Aid for Scientific Research (B)
Apr. 2017 - Mar. 2020

粒界析出組織制御によるアルミニウム合金の信頼性の向上　　　　　　　　　　　　　　　
Grant-in-Aid for Scientific Research (C)
Apr. 2017 - Mar. 2020

Strengthening magnesium alloys by deformation-induced nano clusters　　　　　　　　　　　　　　　
挑戦的萌芽研究
2013 - 2014

Strengthening metallic materials with fcc crystal sturcture up to ideal strength　　　　　　　　　　　　　　　
基盤研究(B)
2012 - 2014

弾性異常合金の理論強度までの高強度化
挑戦的萌芽研究
株式会社豊田中央研究所
2009 - 2010

半導体シリコン中の水素の拡散挙動の解明
奨励研究(A)
東京大学
2001 - 2002

Inhibition of grainboundary cacking in copper-base alloys used in electronic industries
Grant-in-Aid for Scientific Research (B)
The University of Tokyo
2001 - 2002

Study on Hydrogen Embrittlement of High Strength Aluminium Alloys
Grant-in-Aid for Scientific Research (B)
The University of Tokyo
2000 - 2001

特許5929251, 特開2013-155431, IRON ALLOY
FURUTA TADAHIKO, KURAMOTO SHIGERU

特開2013-185249, IRON ALLOY
FURUTA TADAHIKO, KURAMOTO SHIGERU, HOTTA ZENJI, EDALATI KAVEH

特開2010-222632, HIGH STRENGTH Fe-Ni-Co-Ti BASED ALLOY AND METHOD FOR PRODUCING THE SAME
KURAMOTO SHIGERU, FURUTA TADAHIKO

特開2010-189735, TITANIUM ALLOY
SHOJI TETSUYA, NAKAMURA NAOKI, KURAMOTO SHIGERU, MIYAZAKI SHUICHI, KIN KIEI

特許第4257581号, 特開2004-162171, TITANIUM ALLOY AND ITS PRODUCTION METHOD
KURAMOTO SHIGERU, FURUTA TADAHIKO, FAN JONHAN, CHIN RON, SUZUKI NOBUAKI, NISHINO KAZUAKI, SAITO TAKU

特開2008-240035, Al-Zn-Mg BASED DAMPING ALLOY, AND METHOD FOR PRODUCING Al-Zn-Mg BASED DAMPING ALLOY CASTING
KURAMOTO SHIGERU, HARA MASASHI, FURUTA TADAHIKO, NISHINO KAZUAKI

特許第3734317号, 特開平10-110232, AL-MG-SI ALLOY SHEET AND ITS PRODUCTION
KURAMOTO SHIGERU, KAKIO TETSUSHI, HAYASHI MINORU, TOTSUGI YOICHIRO, HASHIGUCHI KOICHI, YUKIMOTO MASAO

特許第3718303号, 特開平10-168536, SPRING MATERIAL FOR MAGNETIC TAPE CASSETTE, AND ITS PRODUCTION
TOTSUGI YOICHIRO, KURAMOTO SHIGERU

特許第3703919号, 特開平10-102178, DIRECTLY CAST AND ROLLED SHEET OF AL-MG-SI ALLOY, AND ITS PRODUCTION
KURAMOTO SHIGERU, KAKIO TETSUSHI, HAYASHI MINORU, TOTSUGI YOICHIRO, MATSUMOTO YOSHIHIRO, YUKIMOTO MASAO

特開2004-83951, LOW THERMAL EXPANSION ALLOY, LOW THERMAL EXPANSION MEMBER AND METHOD FOR PRODUCING THE SAME
SUZUKI NOBUAKI, FURUTA TADAHIKO, KURAMOTO SHIGERU, NISHINO KAZUAKI, SAITO TAKU, CHIN RON, FAN JONHAN, ITO KAZUHIKO

特許第3234511号, 特開平10-130769, AL ALLOY SHEET FOR HIGH SPEED FORMING, ITS PRODUCTION, AND HIGH SPEED FORMING METHOD
KURAMOTO SHIGERU, HAYASHI MINORU, MATSUMOTO YOSHIHIRO, HASHIGUCHI KOICHI