2021年05月, 軽金属功績賞, 一般社団法人軽金属学会
倉本繁
国内学会・会議・シンポジウム等の賞

2014年11月, 軽金属論文賞, 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, （一社）軽金属学会
倉本繁、堀渕嘉代、青井一郎、大石敬一郎

2012年11月, 軽金属学会躍進賞, 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, （一社）軽金属学会
倉本繁

2004年09月, 金属学会技術開発賞, 多機能チタン合金ゴムメタルの開発, （公社）日本金属学会
古田忠彦、倉本繁、ファンジョンハン、伊東一彦、斎藤卓

2002年11月, 軽金属論文賞, 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, （一社）軽金属学会
倉本繁、荒木一郎、菅野幹宏

2000年11月, 軽金属学会奨励賞, 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, （一社）軽金属学会
倉本繁

〔主要な業績〕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, 2025年03月, ［査読有り］

〔主要な業績〕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, 2024年05月, ［査読有り］

〔主要な業績〕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, 2024年02月, ［査読有り］

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, 2024年02月, ［査読有り］

〔主要な業績〕Al-Mg-Si 系合金冷間圧延材の引張特性に及ぼす合金組成と時効条件の影響
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, 責任著者
軽金属, 2023年12月, ［査読有り］

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, 2023年12月, ［査読有り］

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, 2023年12月, ［査読有り］

〔主要な業績〕Fe-Ni-Al-C 系合金冷間圧延材のリューダース型変形挙動に及ぼすγ相安定性の影響
森 柚和・河野 悠太・小林 純也・倉本 繁・江村 聡・澤口 孝宏, 責任著者, 日本鉄鋼協会
鉄と鋼, 2023年08月, ［査読有り］

〔主要な業績〕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, 筆頭著者, 日本金属学会
Materials Transactions, 2023年07月, ［査読有り］

〔主要な業績〕Nanoscale Analysis of Solute Distribution in Ultrahigh-Strength Aluminum Alloys
Equo Kobayashi; Masato Ohnuma; Shigeru Kuramoto; Junya Kobayashi and Goroh Itoh, 責任著者, 日本金属学会
Materials Transactions, 2023年07月, ［査読有り］

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, ラスト(シニア)オーサー
ISIJ International, 2023年02月, ［査読有り］

〔主要な業績〕強ひずみ加工により結晶粒径を微細化した難燃性マグネシウム合金の機械的特性　　　　　　　　　　　　　　　
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, 責任著者, 一般社団法人 軽金属溶接協会
軽金属溶接, 2022年06月, ［査読有り］

〔主要な業績〕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., 2022年04月, ［査読有り］

βチタン合金の局所的変形挙動に及ぼす合金組成及びプロセス条件の影響　　　　　　　　　　　　　　　
沼田和也、米村柊輝、倉本繁、仲川枝里、大村孝仁, 責任著者
チタン, 2022年04月01日, ［招待有り］

Al-0.6Mg-1.0Si-0.5Cu合金の時効析出挙動に及ぼす90%冷間圧延の影響
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, 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.
軽金属, 2021年12月, ［査読有り］

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, 2021年09月22日, ［査読有り］

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, 2021年01月05日, ［査読有り］

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年

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, ラスト(シニア)オーサー
Journal of Alloys and Compounds, 2020年09月24日, ［査読有り］

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, ラスト(シニア)オーサー
Materials Science and Engineering A, 2020年07月, ［査読有り］

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, ラスト(シニア)オーサー, Springer
Archives of Civil and Mechanical Engineering, 2020年05月, ［査読有り］

βチタン合金ゴムメタルの変形その場観察　　　　　　　　　　　　　　　
倉本繁
チタン, 2020年04月01日, ［招待有り］

Assessment of hydrogen embrittlement susceptibility of an Al-Cu-Mg alloy in humid air
Toshiaki Manaka; Takahiro Suzuki; Keisuke Hiyama; Junya Kobayashi; Shigeru Kuromoto; 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年

β型チタン合金の局所的力学挙動に及ぼす相安定性の影響
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年, ［査読有り］

Effect of strain rate on environmental hydrogen embrittlement susceptibility of a severely cold-rolled Al-Cu alloy
Mahdieh Safyari; Masoud Moshtaghi; Shigeru Kuramoto, ラスト(シニア)オーサー
Vacuum, 2019年11月, ［査読有り］

冷間圧延したAl–Fe–Si合金箔の機械的性質に及ぼすFe量の影響
鈴木貴史; 倉本繁; 伊藤吾朗; 崔祺
軽金属, 2019年10月, ［査読有り］

〔主要な業績〕マグネシウム合金の引張特性に及ぼす結晶粒径の影響　　　　　　　　　　　　　　　
坂岡優也、倉本繁、川畑博之、車田亮, 責任著者
軽金属, 2019年07月01日, ［査読有り］

〔主要な業績〕Severe Plastic Deformation to Achieve High Strength and High Ductility in FeNi Based Alloys with Lattice Softening　　　　　　　　　　　　　　　
Shigeru Kuramoto; Tadahiko Furuta, 筆頭著者, The Japan Institute of Metals and Materials
Materials Transactions, 2019年06月07日, ［査読有り］, ［招待有り］

Al–8%Zn–2%Mg–2%Cu–0.15%Zr合金の強度と水素脆化特性に及ぼす冷間圧延の影響　　　　　　　　　　　　　　　
蓼沼宏樹; 倉本繁; 小林純也; 伊藤吾朗; 青井一郎; 清水吉広, 責任著者
軽金属, 2019年06月01日, ［査読有り］

Cracking Process Relates to Hydrogen Behavior in a Duplex Stainless Steel　　　　　　　　　　　　　　　
Afshin Yousefi; Goroh Itoh; Zoha Ghorani; Shigeru Kuramoto
ISIJ International, 2019年06月, ［査読有り］

〔主要な業績〕TEM 内その場観察によるベータ型チタン合金の変形挙動解析　　　　　　　　　　　　　　　
小野瀨航平、倉本繁、鈴木拓哉、Ya-Ling CHANG、仲川枝里、大村孝仁、岩本知広, 責任著者
軽金属, 2019年05月01日, ［査読有り］

βチタン合金ゴムメタルの局所的力学応答　　　　　　　　　　　　　　　
倉本繁
チタン, 2019年04月01日, ［招待有り］

A finite strain elastic-viscoplastic model of Gum Metal　　　　　　　　　　　　　　　
K. Kowalczyk-Gajewska; E.A. Pieczyska; K. Golasiński; M. Maj; Shigeru Kuramoto; Tadahiko Furuta, ラスト(シニア)オーサー, elsevier
International Journal of Plasticity, 2019年02月21日, ［査読有り］

Al–Mg–Si 系合金の粒界割れに及ぼす粒界近傍組織の影響　　　　　　　　　　　　　　　
石澤真悟、倉本繁、伊藤吾朗
軽金属, 2018年12月01日, ［査読有り］

〔主要な業績〕7075アルミニウム合金圧延材の引張特性に及ぼす試験雰囲気の影響　　　　　　　　　　　　　　　
中島祐樹、倉本繁、小林純也、伊藤吾朗、大石敬一郎、青井一郎、清水吉広, 責任著者
軽金属, 2018年11月01日, ［査読有り］

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, 2018年09月05日, ［査読有り］

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, ラスト(シニア)オーサー, 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, 2018年04月07日, ［査読有り］

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, 2018年02月21日, ［査読有り］

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年

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年, ［査読有り］

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年, ［査読有り］

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, 2016年02月, ［査読有り］

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年, ［査読有り］

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年, ［査読有り］

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年, ［招待有り］

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年, ［査読有り］

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年, ［査読有り］

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, 2015年12月, ［査読有り］

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, 2015年03月, ［査読有り］

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, 2015年03月, ［査読有り］

〔主要な業績〕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, 責任著者, 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, 2015年02月, ［査読有り］

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年, ［査読有り］

〔主要な業績〕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　　　　　　　　　　　　　　　
倉本繁; 堀渕嘉代; 青井一郎; 大石敬一郎, 筆頭著者, 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
軽金属, 2014年06月, ［査読有り］

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, 2014年04月, ［査読有り］

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年

The mechanism of strength and deformation in Gum Metal　　　　　　　　　　　　　　　
T. Furuta; S. Kuramoto; J. W. Morris, Jr; N. Nagasako; E. Withey; D. C. Chrzan, 責任著者
Scripta Materialia, 2013年, ［査読有り］, ［招待有り］

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, 2013年01月, ［査読有り］

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, The ω transformation and its correlation with elastic properties were investigated in cold-worked Ti-36Nb-2Ta-3Zr-xO mass% alloys with low body-centered cubic (β) phase stability, known as gum metal. Analysis of the temperature dependence of the ω (hexagonal) phase formation using transmission electron microscopy and of the elastic properties of solution-treated and cold-worked alloys using resonant ultrasound spectroscopy revealed that in the solution-treated 0.36% and 0.51% O alloys, the high concentration of oxygen suppressed ω-phase formation from room temperature to a fairly low temperature of ∼13 K. However, the ω phase was formed by cold working at room temperature in the 0.30% and 0.47% O alloys. Importantly, the fraction of the ω phase clearly increased upon cooling, which indicates that the formation of the ω phase is thermodynamically favorable near and below room temperature in the cold-worked 0.30% and 0.47% O alloys. This formation of the ω phase and the low stability of the β phase related to the low electron/atom (e/a) ratio were the dominant factors determining the elastic properties near and below room temperature in the cold-worked Ti-Nb-Ta-Zr-O alloys. © 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Acta Materialia, 2013年01月01日

Strengthening the Alloys with Elastic Softening in Shear Modulus C’
S. Kuramoto; T. Furuta; N. Nagasako; Z. Horita, 筆頭著者, 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年, ［査読有り］

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, 2012年09月, ［査読有り］

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年, ［査読有り］

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年, ［査読有り］

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年, ［査読有り］

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年

ゴムメタルの変形機構と結晶粒微細化挙動
倉本繁; 古田忠彦; 長廻尚之, 筆頭著者
軽金属, 2012年, ［査読有り］

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, 2010年09月, ［査読有り］

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年, ［査読有り］

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年, ［査読有り］

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, ラスト(シニア)オーサー, 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年

〔主要な業績〕Lattice softening for producing ultrahigh strength of iron base nanocrystalline alloy
S. Kuramoto; T. Furuta; N. Nagasako; Z. Horita, 筆頭著者, 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, 2009年11月, ［査読有り］

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, 2009年06月01日

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, 2009年03月, ［査読有り］

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年

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年

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, 2006年12月20日

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, 2006年07月, ［査読有り］

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, 2006年05月, ［査読有り］

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, 2005年11月

〔主要な業績〕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, 2003年04月

Reply to comments on "Intergranular fracture caused by trace impurities in an Al-5.5 mol% Mg alloy"
K Horikawa; S Kuramoto; M Kanno, The mechanism of high temperature embrittlement caused by trace sodium (similar to2 ppm) in an ultra-high purity Al-5.5 mol% Mg alloy with coarse grains is discussed in comparison with previous reports and other proposed mechanisms. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
SCRIPTA MATERIALIA, 2002年07月

Intergranular fracture caused by trace impurities in an Al-5.5 mol% Mg alloy
K Horikawa; S Kuramoto; M Kanno, A coarse-grained Al-5% Mg alloy, which does not show high temperature embrittlement, is successfully prepared using high purity raw materials and a graphite crucible. By preventing the contamination of sodium and hydrogen, it becomes possible to examine separately the effects of various trace elements on hot ductility in the Al-5% Mg alloy. Sodium, calcium, or strontium of 2 mol ppm brings about the high temperature embrittlement based on intergranular fracture, while lithium of 4 mol ppm does not. Sodium is the most highly embrittling among such detrimental elements. The detrimental effect of such impurity is due to its segregation to grain boundaries. Further, the embrittlement caused by sodium or strontium of 2 mol ppm is greatly suppressed by an addition of more than 1000 mol ppm of silicon which scavenges those detrimental elements from grain boundaries. (C) 2001 Acta Materialia Inc. published by Elsevier Science Ltd. All rights reserved., PERGAMON-ELSEVIER SCIENCE LTD
ACTA MATERIALIA, 2001年11月

超高真空中破壊時に高純度アルミナから放出される極微量ガスの分析 : ガス放出挙動に及ぼす焼結雰囲気, 焼結時間の影響
松本 峰明; 北岡 諭; 松原 秀彰; 倉本 繁; 菅野 幹宏, 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., 公益社団法人日本セラミックス協会
日本セラミックス協会学術論文誌 : Nippon Seramikkusu Kyokai gakujutsu ronbunshi, 2000年03月01日

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, 2000年03月, ［査読有り］

大気中で焼結したAl2O3およびZrO2-8mol%Y2O3の緻密化と組織変化に及ぼす残留ガスの影響
松本 峰明; 中島 達郎; 北岡 諭; 松原 秀彰; 倉本 繁; 菅野 幹宏, 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
日本金属学会誌, 2000年, ［査読有り］

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年

High temperature embrittlement caused by traces of calcium or strontium in an Al-5.5mol%Mg alloy
K Horikawa; S Kuramoto; M Kanno, PERGAMON-ELSEVIER SCIENCE LTD
SCRIPTA MATERIALIA, 1998年09月

Al-5%Mg 合金中の極微量ナトリウムの起源およびその高温延性に及ぼす影響
堀川 敬太郎; 倉本 繁; 菅野 幹宏, This work was performed to clarify the sources of trace sodium which caused a high temperature embrittlement of an Al–5 mass%Mg alloy. Various kinds of Al–5 mass%Mg alloys were prepared by using different raw materials and crucibles. Then, sodium contents of the Al–Mg alloys were analyzed with GD–MS. It was proved that sodium was introduced from the 99.97% purity magnesium. Further, it turned out that sodium was also brought from the 99% purity alumina crucible. Hot ductility of these alloys increased with decrease in the sodium content. From sets of experiments, it is clarified that the high temperature embrittlement of an coarse-grained Al–5 mass%Mg alloy disappears when the sodium content is decreased to 0.01 ppm., 一般社団法人 軽金属学会
軽金属, 1998年08月

Intergranular fracture in some precipitation-hardened aluminum alloys at low temperatures
S Kuramoto; G Itoh; M Kanno, Intergranular fracture at low temperatures from room temperature down to 4.2 K has been studied in some precipitation-hardened aluminum alloys. Microscopic appearance of intergranular facets is revealed to be greatly affected by the microstructure adjacent to the grain boundaries (GBs). When large precipitates on GBs and wide precipitation-free zones (PFZs) are present, coalescence of microvoids initiated at the GB precipitates causes the intergranular fracture with dimples. This fracture process is found to be unaffected by deformation temperature. On the other hand, in the presence of fine precipitates on GBs and narrow PFZs, matrix slip localization exerts significant influence on the fracture behavior. At low temperatures, large stress concentration at GBs leads to intergranular fracture, forming sharp ledges on the fracture surfaces, while at room temperature, the dynamic recovery process is thought to relax such stress concentration, resulting in a transgranular ''ductile'' rupture., MINERALS METALS MATERIALS SOC
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1996年10月

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, 1995年04月, ［査読有り］

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, 1993年10月, ［査読有り］

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年

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年

〔主要な業績〕アルミニウム合金の高強度化に関する組織制街の歴史と最近の話題
伊藤吾朗、倉本繁、小林純也
軽金属, 2023年12月, ［査読有り］

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; 大村孝仁
軽金属学会大会講演概要, 2023年

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
WU Ziang; 石井裕樹; 小林純也; 倉本繁; 伊藤吾朗
軽金属学会大会講演概要, 2023年

超高強度アルミニウム合金中の溶質配置のナノスケール解析
小林郁夫、大沼正人、倉本繁、小林純也、伊藤吾朗
軽金属, 2021年12月, ［査読有り］
責任著者

年間レビュー 力学特性
倉本 繁
軽金属, 2019年08月, ［査読有り］

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, 2019年02月, ［査読有り］

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, 2019年01月, ［査読有り］

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, 2018年04月, ［査読有り］
ラスト(シニア)オーサー

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), 2014年09月10日

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年

チタンの基礎と加工　　　　　　　　　　　　　　　
共著
コロナ社, 2008年11月05日

チタン合金の超音波接合　　　　　　　　　　　　　　　
太田拓毅; 岩本知広; 千田遼介; 倉本繁; 濱田賢祐
日本金属学会講演大会(Web), 2025年
2025, 2025

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, 2024年03月14日
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, 2024年03月14日
20240313, 20240915

T相により強化したAl-Zn-Mg系合金の水素脆化挙動　　　　　　　　　　　　　　　
熱海聡多; WU Ziang; 倉本繁; 増田翔太; 樋口毅; 鈴木智博
軽金属学会大会講演概要, 2024年
2024, 2024

Al-Cu系合金の引張特性と水素脱離挙動に及ぼす時効条件と試験環境の影響　　　　　　　　　　　　　　　
石井裕樹; 小林純也; 倉本繁; 伊藤吾朗
軽金属学会大会講演概要, 2024年
2024, 2024

アルミニウム合金冷間圧延材の引張特性と水素脆化感受性に及ぼす脱ガス処理の影響　　　　　　　　　　　　　　　
WU Ziang; 小林純也; 堀川敬太郎; 倉本繁; 伊藤吾朗
軽金属学会大会講演概要, 2024年
2024, 2024

Al-Zn-Mg-Cu合金の水素脆化割れと粒界析出物/母相界面構造との関係　　　　　　　　　　　　　　　
永井竜太; 伊藤吾朗; 倉本繁; 小林純也; 井誠一郎
軽金属学会大会講演概要, 2024年
2024, 2024

β型チタン合金の引張変形挙動に及ぼす溶体化処理と冷間圧延の影響　　　　　　　　　　　　　　　
畠山璃子; 入屋紀仁; 倉本繁
軽金属学会大会講演概要, 2024年
2024, 2024

Al-Cu-Mg系合金冷間圧延材の引張特性の異方性に及ぼす合金組成の影響　　　　　　　　　　　　　　　
美濃部龍; 石井裕樹; 小林郁夫; 大沼正人; 小林純也; 倉本繁; 伊藤吾朗
軽金属学会大会講演概要, 2024年
2024, 2024

DSCとその場SAXSを組み合わせた2000系アルミニウム合金の各時効段階におけるナノ構造の力学特性への影響評価　　　　　　　　　　　　　　　
福田深; 大沼正人; 倉本繁; 伊藤吾朗; 小林純也; 小林郁夫
軽金属学会大会講演概要, 2024年
2024, 2024

水素プラズマを照射したアルミニウム基板の組織解析　　　　　　　　　　　　　　　
湯田浩登; 伊藤吾朗; 佐藤直幸; 倉本繁; 小林純也
軽金属学会大会講演概要, 2024年
2024, 2024

Fe-Ni-Al-C系合金の引張特性に及ぼすγ相安定性と第2相体積分率の影響　　　　　　　　　　　　　　　
木村環太; 小金沢魁; 高畑光汰; 小林祐馬; 倉本繁; 小林純也; 江村聡; 澤口孝宏
材料とプロセス(CD-ROM), 2024年
2024, 2024

温間圧延TBM鋼の温間引張特性に及ぼす残留オーステナイトの影響　　　　　　　　　　　　　　　
服部克海; 小林純也; 倉本繁; 伊藤吾朗; 北條智彦
材料とプロセス(CD-ROM), 2024年
2024, 2024

ベイニティックフェライトとマルテンサイトを母相とする低合金TRIP鋼板の引張特性に及ぼす加工熱処理の影響　　　　　　　　　　　　　　　
深作隼也; 赤間翔伍; 小林純也; 倉本繁; 伊藤吾朗; 北條智彦
材料とプロセス(CD-ROM), 2024年
2024, 2024

Fe-Ni-Al-C合金における焼なましによる組織・機械的特性への影響　　　　　　　　　　　　　　　
高畑光汰; 木村環太; 倉本繁; 小林純也; 江村聡; 澤口孝宏
材料とプロセス(CD-ROM), 2024年
2024, 2024

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, 2023年11月22日
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, 2023年11月22日
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, 2023年11月11日
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, 2023年11月11日
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, 2023年11月11日
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, 2023年11月11日
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, 2023年11月11日
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, 2023年11月11日
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, 2023年10月11日
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, 2023年09月21日
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, 2023年09月21日
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, 2023年09月20日
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, 2023年09月05日
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, 2023年09月05日
20230904, 20230908

Synthesis of metal hydrides by hydrogen plasma irradiation　　　　　　　　　　　　　　　
T. Ouch; G. Itohi; N. Sato; S. Kuramoto; J. Kobayashi
ICAA18, 2023年09月05日
20230904, 20230908

〔主要な業績〕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), 2023年09月01日, ［招待有り］
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, 2023年08月27日
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, 2023年05月13日
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, 2023年05月13日
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, 2023年05月13日
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, 2023年05月13日
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, 2023年05月13日
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, 2022年11月13日
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, 2022年11月13日
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, 2022年11月13日
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, 2022年11月13日
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, 2022年11月13日
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, 2022年11月13日
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, 2022年11月13日
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, 2022年11月12日
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, 2022年11月12日
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, 2022年11月12日
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, 2022年11月12日
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, 2022年11月12日
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, 2022年11月12日
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, 2022年09月22日
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, 2022年09月22日
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, 2022年09月22日
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, 2022年08月19日
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, 2022年08月19日
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, 2022年08月19日
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, 2022年08月19日
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, 2022年08月19日
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, 2022年08月19日
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, 2022年08月19日
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, 2022年08月19日
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, 2022年05月28日
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, 2022年05月28日
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, 2022年05月28日
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, 2022年05月28日
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, 2022年05月28日
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, 2022年05月28日
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, 2022年05月28日
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, 2021年05月15日
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, 2021年05月15日, ［招待有り］
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, 2022年03月
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, 2022年03月
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, 2021年11月13日
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, 2021年11月13日
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, 2021年11月13日
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, 2021年11月13日
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, 2021年11月13日
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, 2021年11月13日
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, 2021年11月13日
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, 2021年11月13日
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, 2021年11月13日
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, 2021年11月13日
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, 2021年09月
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, 2021年09月
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, 2021年08月
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, 2021年08月
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, 2021年08月
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, 2021年08月
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, 2021年08月
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, 2021年05月15日
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, 2021年05月15日
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, 2021年05月15日
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, 2021年05月15日
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, 2021年05月15日
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, 2021年05月15日
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, 2021年05月15日
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, 2021年05月15日
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, 2021年05月15日
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, 2021年05月15日
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, 2021年05月15日
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, 2021年03月
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, 2021年03月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年11月
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, 2020年09月
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, 2020年09月
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, 2020年09月
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, 2020年03月
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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

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, 2019年11月

ゴムメタルの局所的力学応答に及ぼす冷間加工の影響　　　　　　　　　　　　　　　
柴山裕輝、小野瀨航平、倉本繁、鈴木拓哉、仲川枝里、大村孝仁
軽金属学会第131回秋期大会, 2016年11月05日

Mg-Al-Zn系合金の強度に及ぼす結晶粒径の影響　　　　　　　　　　　　　　　
坂岡優也、須藤岳志、倉本繁、車田亮
軽金属学会第131回秋期大会, 2016年11月05日

強冷間加工を施した7075アルミニウム合金の時効析出過程における組織変化　　　　　　　　　　　　　　　
堀田実、小林郁夫、倉本繁、伊藤吾朗
軽金属学会第131回秋期大会, 2016年11月05日

Al-Zn-Mg系合金冷間圧延材の強度に及ぼす焼入れ温度の影響　　　　　　　　　　　　　　　
中島祐樹、倉本繁、青井一郎、清水吉広
軽金属学会第131回秋期大会, 2016年11月05日

ナノインデンテーションによるゴムメタルの変形機構解析　　　　　　　　　　　　　　　
小野瀨航平、柴山裕輝、倉本繁、鈴木拓哉、仲川枝里、大村孝仁
軽金属学会第131回秋期大会, 2016年11月05日

Al-Zn-Mg系合金冷間圧延材の引張特性に及ぼす試験環境の影響　　　　　　　　　　　　　　　
中島祐樹、倉本繁
軽金属学会第130回春期大会, 2016年05月28日

ゴムメタルの強度に及ぼす変形速度の影響　　　　　　　　　　　　　　　
小野瀨航平、柴山裕輝、倉本繁、鈴木拓哉、仲川枝里、大村孝仁
軽金属学会第130回春期大会, 2016年05月28日

ナノインデンテーションによるゴムメタルの不均一変形挙動の解析　　　　　　　　　　　　　　　
柴山裕輝、小野瀨航平、倉本繁、鈴木拓哉、仲川枝里、大村孝仁
軽金属学会第130回春期大会, 2016年05月28日

Mg-Al-Zn系合金の強度の結晶粒径依存性　　　　　　　　　　　　　　　
坂岡優也、倉本繁
軽金属学会第130回春期大会, 2016年05月28日

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, 2016年03月

Al-8%Zn-2%Mg-2%Cu系合金熱間圧延材のHPT加工による高強度化　　　　　　　　　　　　　　　
青井一郎、大石敬一郎、清水吉広、倉本繁
軽金属学会第129回秋期大会, 2015年11月21日

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, 2015年09月

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, 2015年03月

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, 2015年03月

3DAPによる7075Al合金のHPT加工中の組織形成過程の解析　　　　　　　　　　　　　　　
大石敬一郎、青井一郎、倉本繁、宝野和博
軽金属学会第127回秋期大会, 2014年11月15日

Al-Zn-Mg系合金HPT加工材の機械的特性に及ぼす加工前プロセスの影響　　　　　　　　　　　　　　　
青井一郎、倉本繁、大石敬一郎
軽金属学会第127回秋期大会, 2014年11月15日

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年, ［招待有り］

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年, ［招待有り］

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

2015年, （一社）日本機械学会

2005年, TMS

1998年, （一社）日本鉄鋼協会

1989年, （一社）軽金属学会

1989年, （公社）日本金属学会

超音波誘起格子欠陥の成因解明と制御　　　　　　　　　　　　　　　
基盤研究(B)
2021年04月 - 2025年03月

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
2020年04月 - 2024年03月

〔主要な業績〕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
2022年04月 - 2023年03月

複数の可視化手法による構造用金属材料中の水素存在サイト・移動経路の解析　　　　　　　　　　　　　　　
基盤研究(C)
2020年04月 - 2023年03月

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
2020年04月 - 2023年03月

〔主要な業績〕超高強度アルミニウム合金中の溶質配置のナノスケール解析
統合的先端研究
2019年04月 - 2021年03月

加工誘起ナノクラスターによるアルミニウム合金の環境脆化の抑制　　　　　　　　　　　　　　　
基盤研究(B)
2017年04月 - 2020年03月

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　　　　　　　　　　　　　　　
基盤研究(C)
2017年04月 - 2020年03月

加工誘起ナノクラスターによるＭｇ合金の高強度化　　　　　　　　　　　　　　　
挑戦的萌芽研究
2013年 - 2014年

ｆｃｃ結晶構造を有する金属材料の理想強度化　　　　　　　　　　　　　　　
基盤研究(B)
2012年 - 2014年

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年 - 2010年

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年 - 2002年

電子材料用銅基合金の粒界割れの防止
基盤研究(B)
東京大学
2001年 - 2002年

高力アルミニウム合金の水素脆化の解明
基盤研究(B)
東京大学
2000年 - 2001年

特開2024-090353, 特願2022-206214, Al-Mg-Si系のアルミニウム合金の鋳造熱間加工品及びその製造方法
逢坂 崇, 谷野 仁, 伊藤 吾朗, 倉本 繁

特許5929251, 特開2013-155431, 鉄合金
古田忠彦、倉本繁

特開2013-185249, 鉄合金
古田忠彦、倉本繁、堀田善治、カベーエダラチ

特開2010-222632, 高強度Fe-Ni-Co-Ti系合金およびその製造方法
倉本繁、古田忠彦

特開2010-189735, チタン合金
庄司哲也、中村直樹、倉本繁、宮崎修一、金煕榮

特許第4257581号, 特開2004-162171, チタン合金およびその製造方法
倉本繁、古田忠彦、ファンジョンハン、チンロン、鈴木伸明、西野和彰、斎藤卓

特開2008-240035, Al-Zn-Mg系制振合金およびAl-Zn-Mg系制振合金鋳物の製造方法
倉本繁、原昌司、古田忠彦、西野和彰

特許第3734317号, 特開平10-110232, Al-Mg-Si系合金板の製造方法
倉本繁、垣生哲史、林稔、戸次洋一郎、橋口耕一、行本正雄

特許第3718303号, 特開平10-168536, 磁気テープカセット用ばね材およびその製造方法
戸次洋一郎、倉本繁

特許第3703919号, 特開平10-102178, Al-Mg-Si系合金の直接鋳造圧延板とその製造方法
倉本繁、垣生哲史、林稔、戸次洋一郎、松本義裕、行本正雄

特開2004-83951, 低熱膨張合金、低熱膨張部材およびそれらの製造方法
鈴木伸明、古田忠彦、倉本繁、西野和彰、斎藤卓、チンロン、ファンジョンハン、伊東一彦

特許第3234511号, 特開平10-130769, 高速成形用Al合金板とその製造方法及び高速成形方法
倉本繁、林稔、松本義裕、橋口耕一