小山元道

J-GLOBALへ         更新日: 19/10/09 20:54
 
アバター
研究者氏名
小山元道
 
コヤマ モトミチ
URL
https://akiyamaimr.amebaownd.com/
所属
東北大学
部署
耐環境材料学研究部門
職名
准教授
学位
博士(工学)
科研費研究者番号
20722705
ORCID ID
https://orcid.org/0000-0002-5006-9976

研究分野

 
 

受賞

 
2019年5月
本多記念会 本多記念研究奨励賞 鉄鋼材料の微小疲労き裂進展抵抗に関する研究
 
2018年3月
風戸研究奨励会 風戸研究奨励賞
 
2018年3月
日本金属学会 組織写真賞・奨励費
 
2018年3月
日本鉄鋼協会 俵論文賞
 
2017年3月
日本金属学会 組織写真賞・奨励費
 

論文

 
Alireza Karimi, Reza Razaghi, Motomichi Koyama
Computer Methods and Programs in Biomedicine   182    2019年12月
© 2019 The spontaneous coronary artery dissection (SCAD) is a clinical complication of angioplasty leading to an initiation of a tear/crack in the intima layer of the artery. The crack can propagate to the interface of the intima-media layer follo...
Samsol Faizal Anis, Motomichi Koyama, Shigeru Hamada, Hiroshi Noguchi
Theoretical and Applied Fracture Mechanics   104    2019年12月
© 2019 Elsevier Ltd In this study, the effects of Mg on the fatigue crack growth (FCG) characteristics of precipitation-hardened Al6061 alloys containing Zr and excess Mg are examined. The growth behavior of microstructurally large cracks is inves...
Transformation-assisted hydrogen desorption during deformation in steels: Examples of αʹ- and ε-martensite
T. Hojo, M. Koyama, N. Terao, K. Tsuzaki, E. Akiyama
International Journal of Hydrogen Energy   In press    2019年12月   [査読有り]
EBSD- and ECCI-based assessments of inhomogeneous plastic strain evolution coupled with digital image correlation
R. Kakimoto, M. Koyama, K. Tsuzaki
ISIJ International   In press    2019年12月   [査読有り]
Growth behavior of a mechanically long fatigue crack in an FeCrNiMnCo high entropy alloy: A comparison with an austenitic stainless steel
小山元道
ISIJ International   In press    2019年12月   [査読有り]
B. Li, M. Koyama, S. Hamada, H. Noguchi
Theoretical and Applied Fracture Mechanics   In press    2019年12月   [査読有り]
K. Habib, M. Koyama, T. Tsuchiyama, H. Noguchi
In press    2019年12月   [査読有り]
Evolution of quasi-brittle hydrogen-assisted damages in a dual-phase steel
T. Kumamoto, M. Koyama, K. Sato, K. Tsuzaki
Materials Transactions   In pess    2019年12月   [査読有り]
Akira Maenosono, Motomichi Koyama, Yoshihisa Tanaka, Shien Ri, Qinghua Wang, Hiroshi Noguchi
International Journal of Fatigue   128    2019年11月   [査読有り]
© 2019 Elsevier Ltd We investigated the microstructurally small fatigue crack growth (FCG) in a fully laminated Ti-6Al-4V alloy. Basal slip only causes Mode II FCG, which is the predominant FCG mechanism in the present alloy. However, when the bas...
Motomichi Koyama, Daisuke Yamasaki, Arisa Ikeda, Tomohiko Hojo, Eiji Akiyama, Kenichi Takai, Kaneaki Tsuzaki
International Journal of Hydrogen Energy   44 26028-26035   2019年10月
© 2019 Hydrogen Energy Publications LLC The effects of martensitic transformation on microstructural hydrogen distribution in a multiphase transformation-induced plasticity (TRIP) steel were investigated using silver decoration before and after co...
Akinobu Shibata, Masanori Enoki, Nahoko Saji, Hirotaka Tai, Motomichi Koyama, Hiroshi Ohtani, Nobuhiro Tsuji, Kaneaki Tsuzaki
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   50(9) 4027-4036   2019年9月   [査読有り]
© 2019, The Minerals, Metals & Materials Society and ASM International. This study investigated the effect of hydrogen on the substructure of martensite in Fe-31Ni alloy. In both the hydrogen-charged and uncharged specimens, typical lenticular m...
Motomichi Koyama, Natsuki Terao, Kaneaki Tsuzaki
Materials Letters   249 197-200   2019年8月
© 2019 Elsevier B.V. Hydrogen effects on deformation-induced γ-ε martensitic transformation were revisited in terms of morphology, number density, and fraction of ε-martensite in strained austenitic steel. Hydrogen charging suppresses the stress-a...
Qinghua Wang, Shien Ri, Akira Maenosono, Yoshihisa Tanaka, Motomichi Koyama
Data in Brief   25    2019年8月
© 2019 The Author(s) Dynamic microscale strain distributions with temporal resolution of 1 s in a smooth and a cracked Ti-6Al-4V alloys during one-cycle dwell fatigue tests are illustrated in videos (URL: https://drive.google.com/drive/folders/1pi...
Y. Kuroki, S. Kawano, S. Iikubo, H. Ohtani, M. Koyama, K. Tsuzaki
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   50 3019-3023   2019年7月
© 2019, The Minerals, Metals & Materials Society and ASM International. This study uses first-principles calculations to investigate the effect of hydrogen on the chemical driving force of the transformation of iron from the face centered cubic ...
T. Kumamoto, M. Koyama, K. Sato, K. Tsuzaki
Engineering Fracture Mechanics   216    2019年7月
© 2019 Elsevier Ltd Micro-damage quantification and associated microstructure characterization in a ferrite/martensite dual-phase (DP) steel were performed after tensile tests with different strain rates of 10−2 and 10−4 s−1 in order to understand...
Motomichi Koyama, Kenshiro Ichii, Kaneaki Tsuzaki
International Journal of Hydrogen Energy   44(31) 17163-17167   2019年6月   [査読有り]
© 2019 Hydrogen Energy Publications LLC We investigated the grain refinement effect on the resistance to hydrogen embrittlement in an equiatomic CoCrFeMnNi high-entropy alloy. In a 100 MPa hydrogen gas pre-charging condition, grain refinement to 1...
Qinghua Wang, Shien Ri, Akira Maenosono, Yoshihisa Tanaka, Motomichi Koyama
Mechanics of Materials   133 63-70   2019年6月   [査読有り]
© 2019 Towards clarifying underlying behavior of dwell fatigue in Ti alloys, we here present the first example of 1 second- and 1 μm-resolved full-field dynamic strain mapping. It has been realized by developing a video sampling moiré method comb...
Motomichi Koyama, Cemal Cem Tasan, Kaneaki Tsuzaki
Engineering Fracture Mechanics   214 123-133   2019年6月   [招待有り]
© 2019 Elsevier Ltd The main factors affecting resistance to hydrogen-assisted cracking are hydrogen diffusivity and local ductility. In this context, we note fcc (γ) to hcp (ε) martensitic transformation, instead of γ to bcc (ά) martensitic trans...
Tak Min Park, Min Tae Kim, Kyeong Ho Baik, Motomichi Koyama, Jeongho Han
Materials Characterization   151 221-226   2019年5月   [査読有り]
© 2019 Elsevier Inc. We suggest that the partial recrystallization is a novel pathway to increase the hydrogen embrittlement resistance of Fe-Mn-C twinning-induced plasticity steels. The Fe-18Mn-0.6C (wt%) cold-rolled steel was annealed for from 3...
Zhao Zhang, Motomichi Koyama, Meimei Wang, Cemal Cem Tasan, Hiroshi Noguchi
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   50 1142-1145   2019年3月
© 2019, The Minerals, Metals & Materials Society and ASM International. Pre-cold-rolling before annealing in transformation-induced plasticity (TRIP) maraging steels changes the microstructural morphology from lamellar to granular, increasing th...
Ibrahim Burkay Tuğluca, Motomichi Koyama, Yusaku Shimomura, Burak Bal, Demircan Canadinc, Eiji Akiyama, Kaneaki Tsuzaki
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   50 1137-1141   2019年3月
© 2019, The Minerals, Metals & Materials Society and ASM International. We investigated the strain rate dependency of the hydrogen-induced mechanical degradation of Fe-33Mn-1.1C steel at 303 K within the strain rate range of 10 −2 to 10 −5 s −1...
Shunsuke Mizumachi, Motomichi Koyama, Yoshihiro Fukushima, Kaneaki Tsuzaki
Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   105 93-99   2019年2月
© 2019 Iron and Steel Institute of Japan. All Rights Reserved. Synopsis: Fatigue crack growth characteristics of an Fe20Cr20Ni20Mn20Co high entropy alloy (HEA) were investigated by ΔK increasing compact tension test in comparison with a SUS316L. F...
Ryohei Kakimoto, Motomichi Koyama, Kaneaki Tsuzaki
Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   105 100-108   2019年2月
© 2019 Iron and Steel Institute of Japan. All Rights Reserved. Synopsis: We measured local grain orientation gradient and dislocation density by electron backscatter diffraction (EBSD) measurement and electron channeling contrast imaging (ECCI) to...
Daisuke Sasaki, Motomichi Koyama, Hiroshi Noguchi
ISIJ International   59 1683-1690   2019年1月
© 2019 ISIJ. In order to clarify influence of stress re-distribution effect on hydrogen-induced fatigue crack propagation, we investigated fatigue crack propagation rates and brittle-like fracture ratio. The experiments were conducted in nitrogen ...
Kishan Habib, Motomichi Koyama, Toshihiro Tsuchiyama, Hiroshi Noguchi
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   50 426-435   2019年1月
© 2018, The Minerals, Metals & Materials Society and ASM International. We attempted to clarify the underlying mechanisms of the enhanced small-fatigue-crack resistance of Fe-Mn-C twinning-induced plasticity (TWIP) steel and high-nitrogen austen...
Tsubasa Kumamoto, Motomichi Koyama, Koichi Sato, Kaneaki Tsuzaki
Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   83 221-230   2019年1月
© 2019 Japan Institute of Metals (JIM). All rights reserved. We studied the statistical quantitative analysis of the hydrogen-assisted damage evolution behavior from nano- to micro-scale by combining positron annihilation spectroscopy(PAS)and scan...
Metallurgical Materials Transctions A   50(1) 29-34   2019年1月   [査読有り]
ISIJ International   59(1) 186-191   2019年   [査読有り]
準安定ラメラ組織の疲労き裂進展抵抗
小山元道、野口博司、津﨑兼彰
まてりあ   58 206-213   2019年   [査読有り][招待有り]
Motomichi Koyama, Kenji Hirata, Yuji Abe, Akihiro Mitsuda, Satoshi Iikubo, Kaneaki Tsuzaki
Scientific Reports   8    2018年12月
© 2018, The Author(s). Iron and steels are extensively used as structural materials, and have three primary phase structures: Body-centered cubic (bcc), face-centered cubic (fcc), and hexagonal closed-packed (hcp). Controlling phase stabilities, e...
Wang Qinghua, Ri Shien, Tsuda Hiroshi, Koyama Motomichi
OPTICS AND LASERS IN ENGINEERING   110 155-162   2018年11月   [査読有り]
Effect of shear-affected zone on fatigue crack propagation mode
Shigeru Hamada, Kejin Zhang, Jiwang Zhang, Motomichi Koyama, Tatsuo Yokoi, Hiroshi Noguchi
International Journal of Fatigue   116 36-47   2018年11月   [査読有り]
Roughness-induced stress shielding effect in fatigue crack propagation under Mode II loading
Shigeru Hamada, Taro Suemasu, Shuto Fukudome, Motomichi Koyama, Masaharu Ueda, Hiroshi Noguchi
International Journal of Fatigue   116 245-256   2018年11月   [査読有り]
Takuro Ogawa, Motomichi Koyama, Yuri Nishikura, Kaneaki Tsuzaki, Hiroshi Noguchi
ISIJ International   58 1910-1919   2018年10月
© 2018 ISIJ Fatigue properties of Fe-19Cr-8Ni-0.05C and Fe-19Cr-8Ni-0.14C steels were investigated using a rotating bending fatigue test machine. Fatigue limit of both of the steels were dominated by critical stress amplitude for crack initiation....
K. Hirata, S. Iikubo, M. Koyama, K. Tsuzaki, H. Ohtani
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science   49 5015-5022   2018年10月
© 2018, The Minerals, Metals & Materials Society and ASM International. The hydrogen diffusion behavior in BCC, FCC, and HCP iron has been investigated by means of first-principles calculations. Diffusion coefficients were estimated quantitative...
Koyama Motomichi, Yamasaki Daisuke, Tsuzaki Kaneaki
MATERIALS LETTERS   228 273-276   2018年10月   [査読有り]
Hamada Shigeru, Zhang Jiwang, Zhang Kejin, Koyama Motomichi, Tsuchiyama Toshihiro, Yokoi Tatsuo, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FRACTURE   212(2) 237-248   2018年8月   [査読有り]
Nishikura Yuri, Koyama Motomichi, Yamamura Yusuke, Ogawa Takuro, Tsuzaki Kaneaki, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FATIGUE   113 359-366   2018年8月   [査読有り]
Yoshimura Nobuyuki, Ushioda Kohsaku, Yoshida Yuichi, Sakurada Eisaku, Yonemura Mitsuharu, Koyama Motomichi, Noguchi Hiroshi, Watanabe Chihiro
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   732 212-219   2018年8月   [査読有り]
B. Bal, M. Koyama, D. Canadinc, G. Gerstein, H. J. Maier, K. Tsuzaki
Journal of Engineering Materials and Technology, Transactions of the ASME   140    2018年7月
Copyright © 2018 by ASME. This paper presents a combined experimental and theoretical analysis focusing on the individual roles of microdeformation mechanisms that are simultaneously active during the deformation of twinning-induced plasticity (TW...
Ichii Kenshiro, Koyama Motomichi, Tasan Cemal Cem, Tsuzaki Kaneaki
SCRIPTA MATERIALIA   150 74-77   2018年6月   [査読有り]
Li Bochuan, Koyama Motomichi, Sakurada Eisaku, Yoshimura Nobuyuki, Ushioda Kohsaku, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FATIGUE   110 1-9   2018年5月   [査読有り]
Koyama Motomichi, Yamamura Yusuke, Sawaguchi Takahiro, Tsuzaki Kaneaki, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FATIGUE   108 18-24   2018年3月   [査読有り]
M. Koyama, Y. Tanaka, K. Tsuzaki
Experimental Mechanics   58 381-386   2018年2月
© 2017, Society for Experimental Mechanics. This study presents a microlithography-based approach to increase the spatial resolution of strain mapping by micrographic digital image correlation. A micro-mesh with a lattice size of 500 nm was added ...
Tugluca Ibrahim Burkay, Koyama Motomichi, Bal Burak, Canadinc Demircan, Akiyama Eiji, Tsuzaki Kaneaki
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   717 78-84   2018年2月   [査読有り]
Kishan Habib, Motomichi Koyama, Toshihiro Tsuchiyama, Hiroshi Noguchi
Materials Research Letters   6 61-66   2018年1月
© 2017 The Author(s). The dislocation pattern at the tip of a non-propagating fatigue crack in an Fe-25Cr-1N steel (mass%) was characterized by electron channeling contrast imaging. Planar dislocation arrays on two different slip planes were obser...
Nao Uehata, Motomichi Koyama, Shusaku Takagi, Kaneaki Tsuzaki
ISIJ International   58 179-185   2018年1月
© 2018 ISIJ. We evaluated the availability of an optical-microscopy-based damage quantification method in a ferrite/ martensite dual-phase steel, and interpreted the obtained results toward screening damage evolution behavior under various test co...
Akira Maenosono, Motomichi Koyama, Yoshihisa Tanaka, Shien Ri, Qinghu Wang, Hiroshi Noguchi
Procedia Structural Integrity   13 694-699   2018年1月
© 2018 The Authors. The fatigue life of Ti-6Al-4V alloy exhibits significant scatter, which is derived from the statistical scatter of uncontrollable material factors. In particular, crack propagation behaviors in microstructurally small cracks s...
Shigeru Hamada, Taro Suemasu, Motomichi Koyama, Masaharu Ueda, Hiroshi Noguchi
Procedia Structural Integrity   13 1026-1031   2018年1月
© 2018 The Authors. The essence of rolling contact fatigue is the so-called "Mode II fatigue crack propagation." However, its understanding has not progressed as much as that of Mode I. We think that this cause is the name: "Mode II fatigue crack ...
Kejin Zhang, Shigeru Hamada, Motomichi Koyama, Tatsuo Yokoi, Hiroshi Noguchi
Procedia Structural Integrity   13 1047-1052   2018年1月
© 2018 The Authors. In punched steel plate, "punched specimen" from here onwards, the region near the edge of the punched hole is called the shear-affected-zone (SAZ), where tensile characteristics are compromised due to the punching process. Howe...
Mohammadi Abbas, Koyama Motomichi, Gerstein Gregory, Maier Hans Juergen, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   43(4) 2492-2502   2018年1月   [査読有り]
International Journal of Fracture   213(2) 193-206   2018年   [査読有り]
小山元道、澤口孝宏、津﨑兼彰
鉄と鋼   104 187-200   2018年   [査読有り]
Koyama Motomichi, Abe Yuji, Tsuzaki Kaneaki
ISIJ INTERNATIONAL   58(9) 1745-1747   2018年   [査読有り]
Koyama Motomichi, Sawaguchi Takahiro, Tsuzaki Kaneaki
ISIJ INTERNATIONAL   58(8) 1383-1395   2018年   [査読有り]
Chiba Aya, Koyama Motomichi, Akiyama Eiji, Nishimura Toshiyasu
JOURNAL OF THE ELECTROCHEMICAL SOCIETY   165(2) C19-C26   2018年   [査読有り]
小川 卓郎, 小山 元道, 西倉 優理, 津﨑 兼彰, 野口 博司
鉄 と 鋼 Tetsu-to-Hagané   104(2) 88-97   2018年   [査読有り]
On the unity of crystal plasticity modeling to uncover the individual roles of micro-deformation mechanisms on the work hardening response of Fe-23Mn-0.5C TWIP steel in the presence of hydrogen.
Journal of Engineering Materials and Technology   140 31002-31015   2018年   [査読有り]
International Journal of Fatigue   113 126-136   2018年   [査読有り]
複相鋼の強度/延性におけるロバスト性改善指針:微視的損傷の発達を止める
小山元道
ふぇらむ(躍動)   23 365-369   2018年   [査読有り]
ひずみ・損傷・微視組織のマルチスケール解析~そして水素分布~
小山元道
ふぇらむ(私の論文)      2018年   [査読有り]
Cooling and deformation-induced hydrogen desorption in metastable austenitic steels detected by mass spectroscopy.
Conference proceedings   J03    2018年   [査読有り]
A new design concept for prevention of hydrogen-induced mechanical degradation: viewpoints of metastability and high entropy.
Structural Integrity Procedia      2018年   [査読有り]
Effect of Si on temperature dependence of non-propagation limit of small fatigue crack in a Fe-C alloy.
Structural Integrity Procedia      2018年   [査読有り]
Proposal of fractographic analysis method coupled with EBSD and ECCI.
   2018年   [査読有り]
Small fatigue crack growth in a high entropy alloy.
Structural Integrity Procedia      2018年   [査読有り]
Localized plasticity and associated cracking in stable and metastable high-entropy alloys pre-charged with hydrogen.
Structural Integrity Procedia      2018年   [査読有り]
Strain rate sensitivity of microstructural damage evolution in a dual-phase steel pre-charged with hydrogen.
Structural Integrity Procedia      2018年   [査読有り]
Fatigue crack growth behavior and associated microstructure in a metastable high-entropy alloy.
Structural Integrity Procedia      2018年   [査読有り]
The influence of fracture surface contact in fatigue crack propagation of material having texture under Mode II loading.
Structural Integrity Porcedia      2018年   [査読有り]
Quantification method for parameters affecting multi-scale roughness-induced fatigue crack closure.
Structural Integrity Procedia      2018年   [査読有り]
Analysis of fatigue crack configuration influence on fatigue life.
Structural Integrity Procedia      2018年   [査読有り]
Proposal and verification of novel fatigue crack propagation simulation method by finite element method.
Structural Integrity Procedia      2018年   [査読有り]
Koyama Motomichi, Shimomura Yusaku, Chiba Aya, Akiyama Eiji, Tsuzaki Kaneaki
SCRIPTA MATERIALIA   141 20-23   2017年12月   [査読有り]
Habib Kishan, Koyama Motomichi, Tsuchiyama Toshihiro, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FATIGUE   104 158-170   2017年11月   [査読有り]
Ju Yun-Byum, Koyama Motomichi, Sawaguchi Takahiro, Tsuzaki Kaneaki, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FATIGUE   103 533-545   2017年10月   [査読有り]
Koyama Motomichi, Ogawa Takuro, Yan Dingshun, Matsumoto Yuya, Tasan Cemal Cem, Takai Kenichi, Tsuzaki Kaneaki
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   42(42) 26423-26435   2017年10月   [査読有り]
Li Bochuan, Koyama Motomichi, Hamada Shigeru, Noguchi Hiroshi
ENGINEERING FRACTURE MECHANICS   182 287-302   2017年9月   [査読有り]
Micrographic Digital Image Correlation Coupled with Microlithography: Case Study of Strain Localization and Subsequent Cracking at an FIB Notch Tip in a Laminated Ti-6Al-4VAlloy
M. Koyama, Y. Tanaka, K. Tsuzaki
Experimental Mechanics   58 381-386   2017年9月   [査読有り]
Fukumura Naoki, Li Bochuan, Koyama Motomichi, Suzuki Tomohiro, Hamada Shigeru, Tsuzaki Kaneaki, Noguchi Hiroshi
THEORETICAL AND APPLIED FRACTURE MECHANICS   90 193-202   2017年8月   [査読有り]
Z. Zhang, M. Koyama, M. M. Wang, K. Tsuzaki, C. C. Tasan, H. Noguchi
International Journal of Fatigue   100 176-186   2017年7月
© 2017 Elsevier Ltd The effect of austenitization time on the fatigue crack resistance of transformation-induced plasticity (TRIP)-maraging steel was investigated by observing the crack initiation site, propagation path and fracture surface. Our a...
Koyama Motomichi, Onishi Yosuke, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FRACTURE   206(1) 123-130   2017年7月   [査読有り]
Ogawa Takuro, Koyama Motomichi, Tasan Cemal Cem, Tsuzaki Kaneaki, Noguchi Hiroshi
JOURNAL OF MATERIALS SCIENCE   52(13) 7868-7882   2017年7月   [査読有り]
Yoshimura Nobuyuki, Ushioda Kohsaku, Yonemura Mitsuharu, Koyama Motomichi, Tanaka Masaki, Noguchi Hiroshi
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   701 120-128   2017年7月   [査読有り]
Koyama Motomichi, Yamanouchi Keita, Wang Qinghua, Ri Shien, Tanaka Yoshihisa, Hamano Yasuaki, Yamasaki Shigeto, Mitsuhara Masatoshi, Ohkubo Masataka, Noguchi Hiroshi, Tsuzaki Kaneaki
MATERIALS CHARACTERIZATION   128 217-225   2017年6月   [査読有り]
Habib Kishan, Koyama Motomichi, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FATIGUE   99 1-12   2017年6月   [査読有り]
Wang Qinghua, Ri Shien, Tsuda Hiroshi, Koyama Motomichi, Tsuzaki Kaneaki
OPTICS EXPRESS   25(12) 13465-13480   2017年6月   [査読有り]
Li Bochuan, Koyama Motomichi, Sakurada Eisaku, Yoshimura Nobuyuki, Ushioda Kohsaku, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FATIGUE   98 101-110   2017年5月   [査読有り]
Koyama Motomichi, Akiyama Eiji, Lee Young-Kook, Raabe Dierk, Tsuzaki Kaneaki
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY   42(17) 12706-12723   2017年4月   [査読有り]
T. Nagashima, M. Koyama*, A. Bashir, M. Rohwerder, C. C. Tasan, E. Akiyama, D. Raabe and K. Tsuzaki
Materials and Corrosion 2017   68(3) 306-310   2017年3月   [査読有り]
Koyama Motomichi, Yamasaki Daisuke, Nagashima Tatsuya, Tasan Cemal Cem, Tsuzaki Kaneaki
SCRIPTA MATERIALIA   129 48-51   2017年3月   [査読有り]
Koyama Motomichi, Zhang Zhao, Wang Meimei, Ponge Dirk, Raabe Dierk, Tsuzaki Kaneaki, Noguchi Hiroshi, Tasan Cemal Cem
SCIENCE   355(6329) 1055-1057   2017年3月   [査読有り]
Koyama Motomichi, Li Huichao, Hamano Yasuaki, Sawaguchi Takahiro, Tsuzaki Kaneaki, Noguchi Hiroshi
ENGINEERING FAILURE ANALYSIS   72 34-47   2017年2月   [査読有り]
Omura Toshinobu, Koyama Motomichi, Hamano Yasuaki, Tsuzaki Kaneaki, Noguchi Hiroshi
INTERNATIONAL JOURNAL OF FATIGUE   95 38-44   2017年2月   [査読有り]
Motomichi Koyama, Bohong Ren, Nobuyuki Yoshimura, Eisaku Sakurada, Kohsaku Ushioda, Hiroshi Noguchi
Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan   103 660-666   2017年1月
The coaxing effect has been recognized as a phenomenon that enhances the fatigue resistance associated with work hardening and strainage hardening. To uncover the intrinsic factors that affect the degree of coaxing effect, rotating bending fatigue...
S. F. Anis, M. Koyama, H. Noguchi
Materials Science Forum   889 MSF 143-147   2017年1月
© 2017 Trans Tech Publications, Switzerland. The influence of excess Mg on the Mode I propagation of fatigue crack was examined in newly developed precipitation-hardened Al alloy containing Zr and excess Mg. The aim of this study was to evaluate t...
Q. Wang, S. Ri, Y. Tanaka, M. Koyama
ICCM International Conferences on Composite Materials   2017-August    2017年1月
© 2017 International Committee on Composite Materials. All rights reserved. Owing to high tensile strength and toughness even at high temperatures, titanium (Ti) alloys hold great promise for applications in automobiles, aircraft, spacecraft, etc....
Motomichi Koyama, Takahiro Sawaguchi, Kaneaki Tsuzaki
ICF 2017 - 14th International Conference on Fracture   1 75-76   2017年1月
© 2017 ICF 2017 - 14th International Conference on Fracture. All rights reserved. We used Fe-20Mn, Fe-28Mn, Fe-32Mn, and Fe-40Mn alloys. ε-martensite in the Fe-20Mn alloy critically deteriorated the resistance to hydrogen embrittlement owing to α'...

講演・口頭発表等

 
Designing Hydrogen-Resistant Steels: Effects of Phase Stability, Configurational Entropy and Grain Refinement
小山元道
Hydrogen-Metal System Gordon research conference (GRC)   2019年6月   
Hydrogen embrittlement of advanced stable austenitic steels: examples of high-nitrogen steel and high-entropy alloy
小山元道
International Conference “Corrosion in the Oil & Gas Industry”- Corrosion Oil&Gas 2019   2019年5月   
Microstructure evolution beneath fatigue fracture surface
小山元道
International Conference High-entropy materials (ICHEM)   2018年12月   
A new concept for prevention of hydrogen-induced mechanical degradation: viewpoints of metastability and high entropy. [招待有り]
小山元道
European Conference on Fracture, Belgrade, Serbia   2018年8月   
Microstructural factors enhancing fatigue crack resistance: aspects of metastability and nano-laminates. [招待有り]
小山元道
International Symposium on Innovative Process Design for Structural Materials, Seoul, Korea   2017年9月25日   
鉄鋼材料の疲労き裂進展に及ぼす固溶元素の役割 [招待有り]
小山元道
日本金属学会、東京、招待講演   2017年3月   
Microstructural hydrogen detection and associated damage analysis in steels. [招待有り]
小山元道
Joint hydrogenious and i2cner international workshop on hydrogen-materials interactions 2017, Fukuoka, Japan   2017年2月3日   
マルテンサイトと微小損傷発達:εマルテンサイトを例題に
小山元道
日本金属学会、大阪、奨励賞受賞講演   2016年9月   
Effective utilization of ε-martensite in Fe-High Mn austenitic steels: aspects of deformation-induced reverse transformation. [招待有り]
小山元道
TMS 2016, Nashville Tennessee, USA   2016年2月18日   
Multi-scale anyalysis on hydrogen-assisted damage evokution in fe-ni-c austenite/martensite dual phase steel. [招待有り]
小山元道
International Symposium on Plasticity and Its Current Applications 2016, Keauhou bay, Hawaii, USA   2016年1月5日   

競争的資金等の研究課題

 
水素トラップ状態に及ぼす応力の影響と水素脆化の解明
日本学術振興会: 科研費 基盤A
研究期間: 2019年4月 - 2024年3月    代表者: 秋山英二
高強度鋼の水素脆化における潜伏期から破壊までの機構解明
日本鉄鋼協会: 鉄鋼協会研究プロジェクト
研究期間: 2019年4月 - 2022年3月    代表者: 高井健一
準安定ラメラ組織における疲労き裂進展の組織/力学的研究
日本鉄鋼協会: 鉄鋼研究振興助成
研究期間: 2019年4月 - 2021年3月    代表者: 小山元道
電子チャネリングコントラスト法による転位運動のその場観察
風戸研究奨研究会: 風戸研究奨励賞
研究期間: 2018年4月 - 2020年3月    代表者: 小山元道
常識を破る鉄鋼材料の疲労特性:疲労き裂研究の新機軸
日本学術振興会: 科研費基盤S
研究期間: 2016年 - 2020年    代表者: 津﨑兼彰