Details of the Researcher

PHOTO

Tatsuya Ito
Section
Graduate School of Engineering
Job title
Assistant Professor
Degree

  • Doctor of Philosophy (Engineering) (Tohoku University)

e-Rad No.
90985293

Research History 3

  • 2026/04 - Present
    Tohoku University　Graduate School of Engineering Department of Metallurgy

  • 2023/04 - 2026/03
    Japan Atomic Energy Agency　J-PARC Center

  • 2020/04 - 2023/03
    Japan Society for the Promotion of Science

Education 2

  • Tohoku University　Graduate School of Engineering　Department of Metallurgy

    2018/04 - 2023/03

  • Tohoku University　Faculty of Engineering　Department of Materials Science and Engineering

    2014/04 - 2018/03

Research Interests 5

  • 水素脆化

  • 鉄鋼材料

  • Magnetic materials

  • Martensitic transformation

  • Shape memory alloys

Research Areas 4

  • Nanotechnology/Materials / Structural and functional materials /

  • Energy / Quantum beam science /

  • Nanotechnology/Materials / Structural and functional materials /

  • Nanotechnology/Materials / Structural and functional materials / Shape memory alloys

Awards 4

  1. 優秀ポスター賞

    2018/09　日本金属学会　Pd-Mn-Ga合金におけるマルテンサイト変態と形状記憶効果

  2. 日本金属学会・日本鉄鋼協会奨学賞

    2018/03　日本金属学会、日本鉄鋼協会

  3. 東北大学総長賞

    2018/03　東北大学

  4. グローバル工学奨励賞

    2017/04　東北大学

Papers 17

  1. Dislocation-pinning and dynamic strain-aging in hydrogen-alloyed Fe-Cr-Ni austenitic steel at sub-ambient temperatures Peer-reviewed

    Yuhei Ogawa, Tatsuya Ito, Haruki Nishida, Osamu Takakuwa, Kaneaki Tsuzaki, Stefanus Harjo, Akinobu Shibata

    Acta Materialia　122457-122457　2026/06

    Publisher: Elsevier BV

    DOI： 10.1016/j.actamat.2026.122457 　

    ISSN： 1359-6454

  2. Stress and temperature, rather than hydrogen, govern stacking fault evolution during tensile deformation in Fe–24Cr–19Ni steel Peer-reviewed

    Tatsuya Ito, Yuhei Ogawa, Wu Gong, Takuro Kawasaki, Akinobu Shibata, Stefanus Harjo

    Scripta Materialia　273　(1)　117084　2026/03

    Publisher: Elsevier BV

    DOI： 10.1016/j.scriptamat.2025.117084 　

    ISSN： 1359-6462

  3. Martensitic transformation and shape memory effect in Mn-rich Cu-Mn-Al alloys Peer-reviewed

    Tatsuya Ito, Sheng Xu, Xiao Xu, Toshihiro Omori, Ryosuke Kainuma

    Shape Memory and Superelasticity　9　2025/01

    DOI： 10.1007/s40830-025-00519-y 　

    ISSN： 2199-384X

    More details Close

    The microstructure, crystal structures, cold workability, and martensitic transformation temperatures of several Cu$_{100-{\it x}-{\it y } }$Mn$_{\it x}$Al$_{\it y}$ (40 $\leq$ {\it x} $\leq$ 55; 10 $\leq$ {\it y} $\leq$ 13; at\%) alloys were analyzed. For the first time, martensitic transformation was revealed Mn-rich Cu-Mn-Al alloys. The surface relief of the martensite phase reversibly appeared and disappeared during cooling and heating, along with small thermal hysteresis, implying a thermoelastic transformation. The crystal structures of the parent and martensite phases are B2 and 2M(BCT), respectively, with c\/a being approximately 1.35. Cold workability improves with decreasing Al content, exhibiting a trend similar to that observed for previously reported Cu-rich Cu-Al-Mn shape memory alloys. The martensitic transformation temperatures decrease with increasing Al content and increase with increasing Mn content. These results are consistent with the stability trends of the parent body-centered cubic phase in the phase diagram at high temperature. The shape memory effect with a recovery strain of 1.3\% was observed in a 5.0\% pre-stretched Cu$_{39}$Mn$_{50}$Al$_{11}$ (at\%) sample. This alloy demonstrates moderate cold workability and cost-effectiveness, exhibiting potential as an alternative for conventional shape memory alloys in various applications.

  4. Role of solute hydrogen on mechanical property enhancement in Fe–24Cr–19Ni austenitic steel: An in situ neutron diffraction study Peer-reviewed

    Tatsuya Ito, Yuhei Ogawa, Wu Gong, Wenqi Mao, Takuro Kawasaki, Kazuho Okada, Akinobu Shibata, Stefanus Harjo

    Acta Materialia　287　120767-120767　2025/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.actamat.2025.120767 　

    ISSN： 1359-6454

  5. In situ neutron diffraction study to elucidate hydrogen effect on the deformation mechanism in Type 310S austenitic stainless steel Peer-reviewed

    Tatsuya Ito, Yuhei Ogawa, Wu Gong, Wenqi Mao, Takuro Kawasaki, Kazuho Okada, Akinobu Shibata, Stefanus Harjo

    Proceedings of the 7th International Symposium on Steel Science (ISSS 2024)　237-240　2024/11

    DOI： 10.2355/isijisss.2024.0_237 　

    More details Close

    Hydrogen embrittlement has long been an obstacle to the development of safe infrastructure. However, in contrast to hydrogen's embrittling effect, recent research has revealed that the addition of hydrogen improves both the strength and uniform elongation of AISI Type 310S austenitic stainless steel. A detailed understanding of how hydrogen affects the deformation mechanism of this steel could pave the way for the development of more advanced materials with superior properties. In the present study, {\it in situ} neutron diffraction experiments were conducted on Type 310S steel with and without hydrogen-charged to investigate the effect of hydrogen on the deformation mechanism. In addition to the effect of solid-solution strengthening by hydrogen, the q-value, a parameter representing the proportion of edge and screw dislocations in the accumulated dislocations, was quantitatively evaluated using CMWP analysis on neutron diffraction patterns. The comparison of q-values between the hydrogen-charged and non-charged samples reveals that hydrogen has minimal effect on dislocation character in Type 310S steel.

  6. Pd$_{2}$MnGa Metamagnetic Shape Memory Alloy with Small Energy Loss Peer-reviewed

    Tatsuya Ito, Xiao Xu, Atsushi Miyake, Yuto Kinoshita, Makoto Nagasako, Kohki Takahashi, Toshihiro Omori, Masashi Tokunaga, Ryosuke Kainuma

    Advanced Science　10　(23)　2023/06/12

    DOI： 10.1002/advs.202207779 　

    ISSN： 2198-3844

  7. Martensitic transformation near room temperature and hysteresis in (Ni-Co)$_{50}$-Mn-Sn metamagnetic shape memory alloys Peer-reviewed

    Tomoya Miyakawa, Tatsuya Ito, Xiao Xu, Toshihiro Omori, Ryosuke Kainuma

    JOURNAL OF ALLOYS AND COMPOUNDS　913　(25)　165136　2022/08

    DOI： 10.1016/j.jallcom.2022.165136 　

    ISSN： 0925-8388

    eISSN： 1873-4669

  8. Martensitic transformation and shape memory effect in Pd$_{50}$Mn$_{50-x}$Ga$_{x}$ alloys Peer-reviewed

    Tatsuya Ito, Yuta Kimura, Xiao Xu, Kwangsik Han, Rie Y. Umetsu, Toshihiro Omori, Ryosuke Kainuma

    Journal of alloys and compounds　805　(15)　379-387　2019/10

    DOI： 10.1016/j.jallcom.2019.06.077 　

    ISSN： 0925-8388

    eISSN： 1873-4669

  9. Integrated neutron and surface-based characterization of stress/strain fields and microstructural evolution during fatigue crack growth in SUS304 stainless steel Peer-reviewed

    Su Y. H., Shinohara Takenao, Parker J. D.*, Oikawa Kenichi, Kai Tetsuya, Gong W., Ito Tatsuya, Harjo S., Aizawa Kazuya, Kiyanagi Yoshiaki*, Tomota Yo*

    Materials Science \& Engineering A　951　149607\_1-149607\_16　2026/01

    DOI： 10.1016/j.msea.2025.149607 　

    ISSN： 0921-5093

    More details Close

    Local variations in residual stress/strain and microstructure during fatigue crack growth in compact tension specimens of SUS304 austenitic stainless steel were investigated using complementary methods: pulsed neutron Bragg-edge imaging (NBEI), neutron diffraction (ND), digital image correlation (DIC) and electron backscatter diffraction (EBSD). Surface strain fields were evaluated using DIC and EBSD. NBEI provided two-dimensional averaged microstructure information, whereas ND yielded detailed three-dimensional distributions of residual lattice (elastic) strain and stress. This study particularly focused on how NBEI is helpful in understanding overall damage characteristics in the vicinity of a crack tip two-dimensionally. Distribution of microstructural parameters associated with crack growth, such as lattice constant, crystallite size, and texture, across the entire specimen was considered using Bragg-edge spectral analysis. The plastic zone in front of the crack tip, characterized by reduced crystallite size, was observed during crack propagation. After final fracture, two distinct zones with reduced crystallite size were identified: one caused by localized plastic deformation near the crack tip, and the other by bending at the back end of the specimen. This paper introduces the four experimental techniques and describes their respective features. Each method has its own advantages and limitations; However, by integrating their results, a more comprehensive understanding of the overall stress/strain field can be achieved.

  10. Cryogenic tensile testing system for simultaneous in situ neutron diffraction and digital image correlation strain analysis Peer-reviewed

    Takuro Kawasaki, Stefanus Harjo, Wu Gong, Wenqi Mao, Takayuki Yamashita, Tatsuya Ito, Kazuya Aizawa

    Review of Scientific Instruments　96　093901　2025/09/01

    DOI： 10.1063/5.0274548 　

  11. Unique deformation behavior of ultrafine-grained 304 stainless steel at 20 K Peer-reviewed

    Mao W.*, Gong W., Kawasaki Takuro, Gao S.*, Ito Tatsuya, Yamashita Takayuki*, Harjo S., Zhao L.*, Wang Q.*

    Scripta Materialia　264　116726　2025/07

    DOI： 10.1016/j.scriptamat.2025.116726 　

    ISSN： 1359-6462

    More details Close

    An ultrafine-grained 304 austenitic stainless steel exhibited pronounced serrated Luders deformation at 20 K, with stress and temperature oscillations reaching 200 MPa and 20 K. {\it In-situ} neutron diffraction and digital image correlation revealed discontinuous Luders band propagation and burst martensite formation. During deformation, austenite phase stress remained lower than at upper yielding, indicating elastic behavior. Notably, martensite phase stress stayed lower than austenite until fracture, likely due to stress relaxation from burst martensitic transformation at 20 K. The low martensite stress delayed brittle fracture until austenite plastically yielded during uniform deformation.

  12. Martensitic transformation-governed Lüders deformation enables large ductility and late-stage strain hardening in ultrafine-grained austenitic stainless steel at low temperatures Peer-reviewed

    Wenqi Mao, Si Gao, Wu Gong, Takuro Kawasaki, Tatsuya Ito, Stefanus Harjo, Nobuhiro Tsuji

    Acta Materialia　278　120233-120233　2024/10

    Publisher: Elsevier BV

    DOI： 10.1016/j.actamat.2024.120233 　

    ISSN： 1359-6454

  13. Experimental Determination of Phase Equilibria in the Mn-Zn Binary System Peer-reviewed

    Daisuke Imatomi, Ryosuke Ishikawa, Akira Nakata, Tatsuya Ito, Kwangsik Han, Makoto Nagasako, Xiao Xu, Toshihiro Omori, Ryosuke Kainuma

    Journal of Phase Equilibria and Diffusion　45　(1)　3-17　2024/02

    DOI： 10.1007/s11669-023-01068-6 　

    ISSN： 1547-7037

    eISSN： 1863-7345

  14. Martensitic and magnetic transitions in Ni$_{2+x}$MnGa$_{1-x}$ ferromagnetic shape memory alloys Peer-reviewed

    T. Eto, X. Xu, T. Ito, F. Honda, D. X. Li, G. Oomi, F. Nakamura, H. Masumoto, R. Kainuma, T. Kanomata

    Journal of Alloys and Compounds　871　(5)　159480　2021/08/05

    DOI： 10.1016/j.jallcom.2021.159480 　

    ISSN： 0925-8388

  15. Magnetoresistance and Thermal Transformation Arrest in Pd$_{2}$Mn$_{1.4}$Sn$_{0.6}$ Heusler Alloys. International-journal Peer-reviewed

    Xiao Xu, Hironari Okada, Yusuke Chieda, Naoki Aizawa, Daiki Takase, Hironori Nishihara, Takuo Sakon, Kwangsik Han, Tatsuya Ito, Yoshiya Adachi, Takumi Kihara, Ryosuke Kainuma, Takeshi Kanomata

    Materials (Basel, Switzerland)　12　(14)　238　2019/07/19

    DOI： 10.3390/ma12142308 　

    More details Close

    The magnetization, electric resistivity, and magnetoresistance properties of Pd 2 Mn 1 . 4 Sn 0 . 6 Heusler alloys were investigated. The Curie temperature of the parent phase, martensitic transformation temperatures, and magnetic field dependence of the martensitic transformation temperatures were determined. The magnetoresistance was investigated from 10 to 290 K, revealing both intrinsic and extrinsic magnetoresistance properties for this alloy. A maximum of about - 3 . 5 % of intrinsic magnetoresistance under 90 kOe and of about - 30 % of extrinsic magnetoresistance under 180 kOe were obtained. Moreover, the thermal transformation arrest phenomenon was confirmed in the Pd 2 Mn 1 . 4 Sn 0 . 6 alloy, and an abnormal heating-induced martensitic transformation (HIMT) behavior was observed.

  16. Crystal structure and superelasticity in Pd-Mn-Ga alloys

    Tatsuya Ito, Yuta Kimura, Xiao Xu, Toshihiro Omori, Ryosuke Kainuma

    Proceedings of the 6th ICFSMA　62-63　2019/06

  17. T − x phase diagram in Heusler compounds Ni2+xMnGa1−x

    T. Eto, X. Xu, T. Ito, F. Honda, D. Li, G. Oomi, R. Kainuma, T. Kanomata

    Proceedings of the 6th ICFSMA　194-195　2019/06

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Misc. 11

  1. Utilizing Hydrogen as a Beneficial Element in Steel Development －Investigation of How Hydrogen Enhances the Strength and Ductility of Stainless Steel Using Neutron Diffraction－ Invited

    Tatsuya Ito

    JAEA R&D Navigator　2026/03/10

    Publisher: Japan Atomic Energy Agency

  2. In situ Neutron Diffraction Study on the Strength and Ductility Enhancement Mechanism of Hydrogen-charged SUS310S Stainless Steel Invited

    Tatsuya Ito, Yuhei Ogawa, Wu Gong, Wenqi Mao, Takuro Kawasaki, Kazuho Okada, Akinobu Shibata, Stefanus Harjo

    35　(3)　129-133　2025/08

  3. Development of Pd$_{2}$MnGa metamagnetic shape memory alloy with small energy loss Invited

    Ito Tatsuya, Xu Xiao, Omori Toshihiro, Kainuma Ryosuke

    Busseiken Dayori　63　(3)　8-10　2023/10

    ISSN： 0385-9843

  4. Excellent combination of strength and ductility of an ultrafine-grained stainless steel at cryogenic temperatures studied by in situ neutron diffraction

    MAO Wenqi, GAO Si, GONG Wu, KAWASAKI Takuro, ITO Tatsuya, HARJO Stefanus

    量子ビームサイエンスフェスタ(Web)　2023　2024

  5. Effect of Mn content on critical stresses in single-crystal Cu-Al-Mn superelastic alloys

    谷川由果, XU Sheng, XU Sheng, 伊東達矢, GONG Wu, HARJO Stefanus, 大森俊洋, 貝沼亮介

    材料とプロセス(CD-ROM)　37　(2)　2024

    ISSN： 1882-8922

  6. Deformation behavior of ultrafine-grained austenitic steel at low temperatures

    マオ ウェンチ, マオ ウェンチ, 伊東達矢, ゴン ウー, 川崎卓郎, HARJO Stefanus, ガオ シ, 辻伸泰

    材料とプロセス(CD-ROM)　37　(2)　2024

    ISSN： 1882-8922

  7. Highlighted Studies of Engineering Materials at TAKUMI of J-PARC in 2022

    HARJO Stefanus, GONG Wu, 川崎卓郎, MAO Wenqi, 伊東達矢

    日本中性子科学会年会講演概要集　23rd　2023

  8. Cu-Al-Mn合金における極低温弾性熱量効果の直接測定

    許勝, 宋雨鑫, 伊東達矢, 川崎卓郎, ハルヨ ステファヌス, ゴン ウー, 許皛, 大森俊洋, 貝沼亮介

    日本金属学会講演大会(Web)　173rd　2023

  9. その場中性子回折によるCo-Cr-Al-Si超弾性合金におけるマルテンサイト変態過剰応力の調査

    清水来紀, 許皛, 伊東達矢, ゴン ウー, ハルヨ ステファヌス, 大森俊洋, 貝沼亮介

    日本金属学会講演大会(Web)　173rd　2023

  10. Mn-Zn二元系状態図の全組成域における実験的決定

    今富大介, 石川遼典, 仲田玲, 伊東達矢, 伊東達矢, 韓光植, 韓光植, 長迫実, 許きょう, 許きょう, 大森俊洋, 貝沼亮介

    日本金属学会講演大会(Web)　173rd　2023

  11. Metamagnetic transition in Pd2MnGa-based alloys

    伊東達矢, XU Xiao, XU Xiao, 三宅厚志, 木下雄斗, 長迫実, 大森俊洋, 徳永将史, 貝沼亮介

    材料とプロセス(CD-ROM)　34　(2)　2021

    ISSN： 1882-8922

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Presentations 58

  1. その場中性子回折が明かす、水素添加によるステンレス鋼の機械特性向上メカニズム Invited

    伊東 達矢

    第33回 みちのく磁性談話会　2026/07/04

  2. Mechanisms of hydrogen-induced strength and ductility enhancement in stainless steel revealed by neutron diffraction Invited

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Shibata Akinobu*, Okada Kazuho*, Harjo S.

    2025年度量子ビームサイエンスフェスタ　2026/03/12

  3. Revealing the role of hydrogen in enhancing both strength and ductility of Type 310S austenitic steel via {\it in situ} neutron diffraction International-presentation Invited

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Okada Kazuho*, Shibata Akinobu*, Harjo S.

    Materials Research Meeting 2025 (MRM 2025)

    More details Close

    Hydrogen is being considered as an alternative energy carrier to fossil fuels to achieve the goal of "Carbon Neutrality". While hydrogen has historically been associated with causing steel embrittlement, Ogawa et al. reported that the introduction of hydrogen to a Fe-24Cr-19Ni-based (mass\%) austenitic stainless steel (AISI Type 310S) enhances both strength and ductility, thus counteracts the embrittlement effect. Although this phenomenon was qualitatively explained by the hydrogen-induced solid-solution strengthening and the promotion of deformation twinning, the influence of hydrogen on the development of dislocations and stacking faults (i.e., twin nuclei) during deformation remains less understood. Furthermore, the mechanism promoting twinning is not well established. In this study, we conducted in situ neutron diffraction measurement using TAKUMI of J-PARC to investigate the influence of hydrogen on the evolution of these crystal defects and to reveal the role of solute hydrogen in enhancing both strength and ductility.

  4. None Invited

    Ito Tatsuya

    日本MRS水素科学技術連携研究会; 第21回トピックス研究会(工学分科会)　2025/12/15

  5. In situ neutron diffraction study of stacking fault energy in hydrogen-charged Type 310S austenitic steel at low temperatures International-presentation

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Shibata Akinobu*, Harjo S.

    ASTM Conference on Hydrogen in Materials

    More details Close

    Stacking fault energy ($\gamma_{\mathrm{SF } }$) plays a crucial role in various deformation processes of austenitic steel, such as dislocation motion, deformation twinning, and martensitic transformation. Several previous studies have reported that hydrogen reduces $\gamma_{\mathrm{SF } }$. However, our recent in situ neutron diffraction experiment has shown that hydrogen has minimal effect on the $\gamma_{\mathrm{SF } }$ of Fe-24Cr-19Ni (AISI Type 310S) steel during tensile deformation at room temperature, despite significant reductions in $\gamma_{\mathrm{SF } }$ due to hydrogen reported for a similar composition steel. Moreover, a recent study analyzing the work-hardening behavior of several hydrogen-charged austenitic stainless steels has suggested that hydrogen may have only a limited impact on $\gamma_{\mathrm{SF } }$. These findings indicate the need for further research to clarify the influence of hydrogen on $\gamma_{\mathrm{SF } }$. In this study, we investigated the effect of hydrogen on the $\gamma_{\mathrm{SF } }$ of Type 310S austenitic steel at low temperatures using in situ neutron diffraction.

  6. Exploring hydrogen's role in deformation mechanisms of SUS310S austenitic steel using TAKUMI International-presentation Invited

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Okada Kazuho*, Shibata Akinobu*, Harjo S.

    4th J-PARC Symposium (J-PARC 2024)

    More details Close

    Hydrogen is attracting attention as an alternative energy carrier to fossil fuels to establish a sustainable society. However, hydrogen is considered to cause embrittlement in steel, which has been a longstanding issue known as hydrogen embrittlement. In contrast to the embrittlement, recently, Ogawa {\it et al.}, reported that the addition of hydrogen improved both strength and ductility in SUS310S (Fe-24Cr-19Ni mass\%) steel. This phenomenon is attributed to hydrogen-induced solid solution strengthening and the promotion of twinning deformation. These approaches are gaining attention as effective ways to utilize hydrogen, which has long been considered harmful. However, the impact of hydrogen on crystal defects (dislocations, stacking faults) and the mechanisms behind enhanced twinning in SUS310S steel remain unclear. In this work, we investigated the deformation mechanisms of hydrogen-charged SUS310S steel by {\it in situ} neutron diffraction measurement conducted by TAKUMI (MLF-BL19) of J-PARC.

  7. Examining the cryogenic elastocaloric effect in a Cu-Al-Mn alloy

    Sheng Xu, Yuxin Song, Tatsuya Ito, Takuro Kawasaki, Stefanus Harjo, Wu Gong, Xiao Xu, Toshihiro Omori, Ryosuke Kainuma

    NIMS Award Symposium 2023　2023/11/06

  8. Investigation of extra-stress in martensitic transformation in Co-Cr-Al-Si superelastic alloy by in-situ neutron diffraction

    Shimizu Raiki, Xu Xiao, Ito Tatsuya, Gong Wu, Harjo Stefanus, Omori Toshihiro, Kainuma Ryosuke

    2023/09/21

  9. Experimental determination of phase equilibria in whole range of the Mn-Zn binary system

    Imatomi Daisuke, Ishikawa Ryosuke, Nakata Akira, Ito Tatsuya, Han Kwangsik, Nagasako Makoto, Xu Xiao, Omori Toshihiro, Kainuma Ryosuke

    2023/09/21

  10. Deformation mechanism analysis of hydrogen-charged SUS310S using in situ neutron diffraction measurements

    Ito Tatsuya, Ogawa Yuhei, Gong Wu, Kawasaki Takuro, Okada Kazuho, Shibata Akinobu, Harjo Stefanus

    2023/09/21

  11. Cu-Al-Mn合金における極低温弾性熱量効果の直接測定

    許 勝, 宋 雨鑫, 伊東 達矢, 川崎 卓郎, ハルヨ ステファヌス, ゴン ウー, 許 皛, 大森 俊洋, 貝沼 亮介

    日本金属学会2023年秋期(第173回)講演大会　2023/09/19

  12. Phase equilibria in the Mn-Zn binary system

    Daisuke Imatom, Ryosuke Ishikawa, Akira Nakata, Tatsuya Ito, Kwangsik Han, Makoto Nagasako, Xiao Xu, Toshihiro Omori, Ryosuke Kainuma

    50th International Conference on Computer Coupling of Phase Diagrams and Thermochemistry (CALPHAD)　2023/06/26

  13. Metamagnetic shape memory effect with small hysteresis in the Pd-Mn-Ga alloy

    Tatsuya Ito, Xiao Xu, Atsushi Miyake, Yuto Kinoshita, Makoto Nagasako, Kohki Takahashi, Masashi Tokunaga, Ryosuke Kainuma

    The 7th International Conference on Ferromagnetic Shape Memory Alloys (ICFSMA 2023)　2023/05/18

  14. Order-disorder transition and antiferromagnetism in Cu-Mn-Al BCC alloys International-presentation

    T. Ito, X. Xu, T. Omori, K. Namba, T. Saito, R. Kainuma

    TMS 2023 Annual Meeting　2023/03/20

  15. Martensitic and magnetic transitions in Ni2-xMnGa1+x Heusler alloys

    T. Eto, H. Maeta, X. Xu, T. Ito, R. Kainuma, Y. Amako, Y. Adachi, T. Kanomata

    2023/03/07

  16. Novel Co-Al-Si shape memory alloys with B2-structured parent phase International-presentation

    S. Mochimaru, T. Ito, S. Xu, X. Xu, T. Omori, R. Kainuma

    2022 MRS(Materials Research Society) Fall Meeting &Exhibit　2022/11/29

  17. Co-Al-Si合金におけるB2/L10マルテンサイト変態と超弾性

    持丸 駿哉, 伊東 達矢, 許 勝, 許 皛, 大森 俊洋, 貝沼 亮介

    日本金属学会2022年秋期講演大会　2022/09/23

  18. Martensitic transformation and metamagnetic transition in Pd2MnGa-based alloys International-presentation

    T. Ito, X. Xu, A. Miyake, Y. Kinoshita, M. Nagasako, K. Takahashi, T. Omori, M. Tokunaga, R. Kainuma

    16th International Conference on Martensitic Transformation　2022/03/15

  19. Thermoelastic martensitic transformation in Mn-rich Mn-Cu-Al BCC alloys International-presentation

    T. Ito, X. Xu, T. Omori, R. Kainuma

    TMS 2022 Annual Meeting　2022/03/14

  20. Pd2MnGa基合金における低ヒステリシスマルテンサイト変態とメタ磁性相転移

    伊東 達矢, 許 皛, 三宅 厚志, 木下 雄斗, 長迫 実, 大森 俊洋, 徳永 将史, 貝沼 亮介

    ASMA2022年ポスター発表会　2022/03/11

  21. Mn-Zn系合金における変位型相変態

    許 皛, 仲田 玲, 石川 遼典, 伊東 達矢, 大森 俊洋, 貝沼 亮介

    日本金属学会2021年秋期講演大会　2021/09/17

  22. Pd2MnGa基合金におけるメタ磁性相転移

    伊東 達矢, 許 皛, 三宅 厚志, 木下 雄斗, 長迫 実, 大森 俊洋, 徳永 将史, 貝沼 亮介

    日本金属学会2021年秋期講演大会　2021/09/17

  23. Cu2Mn1+xAl1-x合金における規則－不規則変態と磁気特性

    伊東 達矢, 許 皛, 貝沼 亮介

    日本金属学会2020年秋期講演大会　2020/09/17

  24. Cu-Mn-Al系BCC合金における磁気転移

    伊東 達矢, 許 皛, 貝沼 亮介

    日本金属学会2020年春期講演大会　2020/03/17

  25. Pd–Mn–Ga 合金における形状記憶効果と磁気特性

    伊東 達矢, 木村 雄太, 許 皛, 大森 俊洋, 貝沼 亮介

    第26回みちのく磁性談話会　2019/06/15

  26. T −x phase diagram in Heusler compounds Ni2+xMnGa1−x International-presentation

    T. Eto, X. Xu, T. Ito, F. Honda, D. Li, G. Oomi, R. Kainuma, T. Kanomata

    The 6th annual International Conference on Ferromagnetic Shape Memory Alloys (ICFSMA 2019))

  27. Crystal structure and superelasticity in Pd‐Mn‐Ga alloys International-presentation

    T. Ito, Y. Kimura, X. Xu, T. Omori, R. Kainuma

    The 6th annual International Conference on Ferromagnetic Shape Memory Alloys (ICFSMA 2019))　2019/06/03

  28. Pd–Mn–Ga 合金のマルテンサイト変態と形状記憶効果

    伊東 達矢, 木村 雄太, 許 皛, 大森 俊洋, 鹿又 武, 貝沼 亮介

    日本金属学会2018年秋期講演大会　2018/09/19

  29. Mechanism of strength and ductility enhancement in SUS310S steel by hydrogen; In situ neutron diffraction study during deformation over a wide temperature range

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Shibata Akinobu*, Harjo S.

    日本中性子科学会第25回年会

  30. Understanding the deformation behavior of stainless steels in hydrogen-charged or low-temperature environments; In situ neutron diffraction study International-presentation

    Harjo S., Ito Tatsuya, Mao W.*, Gong W., Kawasaki Takuro

    21th International Symposium on Characterization of Metals and Nanostructured Materials by Neutron and X-ray Synchrotron Scattering (NeXS 2025)

    More details Close

    The establishment of a hydrogen society is critically important for achieving carbon neutrality and building a sustainable society. To realize this, it is essential to develop highly reliable steel materials that can maintain high strength and ductility even in a wide temperature range, including hydrogen environments and cryogenic conditions. For this purpose, understanding the mechanisms governing the mechanical properties under such environments is crucial. In this study, the deformation mechanisms of stainless steels under hydrogen charging and cryogenic conditions were analyzed based on atomic-level structural changes using in-situ neutron diffraction techniques.

  31. Evaluation of hydrogen effects on martensitic transformation and stacking faults in stainless steel by {\it in situ} neutron diffraction

    Ito Tatsuya, Ogawa Yuhei, Gong W., Kawasaki Takuro, Shibata Akinobu, Harjo S.

    日本金属学会2025年秋期(第177回)講演大会　2025/09/17

  32. {\it In situ} neutron diffraction study on the development of martensitic transformation in hydrogen-charged Type 316L steel at low temperature International-presentation

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Shibata Akinobu*, Harjo S.

    International Conference on Martensitic Transformations (ICOMAT 2025)

    More details Close

    Elucidating the influence of hydrogen on the deformation mechanisms of steel is essential for ensuring the reliability and safety of hydrogen infrastructure. In this study, we focused on Type 316L austenitic stainless steel (Fe-17Cr-12Ni, mass\%), a material widely employed in hydrogen infrastructure applications. This alloy undergoes a martensitic transformation from $\gamma$(FCC) to $\varepsilon$(HCP) and/or $\alpha$' (BCC) phases when deformed at low temperatures. This transformation is closely associated with hydrogen embrittlement and is considered one of the key factors limiting the alloy's lower service temperature. Understanding the effect of hydrogen on this transformation is therefore crucial; however, it remains under debate whether hydrogen promotes or suppresses the transformation. To address this issue, we employed {\it in situ} neutron diffraction to investigate the evolution of martensite phase fractions during low-temperature deformation of hydrogen-charged Type 316L steel.

  33. In situ neutron diffraction study on the development of martensitic transformation in hydrogen-charged Type 316L steel at low temperature International-presentation

    Ito Tatsuya, Ogawa Yuhei, Gong W., Kawasaki Takuro, Shibata Akinobu, Harjo S.

    International Conference on Martensitic Transformations (ICOMAT 2025)

    More details Close

    Elucidating the influence of hydrogen on the deformation mechanisms of steel is essential for ensuring the reliability and safety of hydrogen infrastructure. In this study, we focused on Type 316L austenitic stainless steel (Fe-17Cr-12Ni, mass\%), a material widely employed in hydrogen infrastructure applications. This alloy undergoes a martensitic transformation from $\gamma$(FCC) to $\varepsilon$(HCP) and/or $\alpha$' (BCC) phases when deformed at low temperatures. This transformation is closely associated with hydrogen embrittlement and is considered one of the key factors limiting the alloy's lower service temperature. Understanding the effect of hydrogen on this transformation is therefore crucial; however, it remains under debate whether hydrogen promotes or suppresses the transformation. To address this issue, we employed {\it in situ} neutron diffraction to investigate the evolution of martensite phase fractions during low-temperature deformation of hydrogen-charged Type 316L steel.

  34. None

    Harjo S., Ito Tatsuya, Mao W.*, Gong W., Kawasaki Takuro, Ogawa Yuhei*, Gao S.*, Shibata Akinobu*

    日本金属学会2025年秋期(第177回)講演大会

  35. Martensitic transformation-dominated Luders deformation in ultrafine-grained 304 steel at 77K International-presentation

    Harjo S., Mao W.*, Gao S.*, Ito Tatsuya, Gong W., Kawasaki Takuro

    International Conference on Martensitic Transformations (ICOMAT 2025)

    More details Close

    304 stainless steel is a metastable austenitic steel where deformation induces dislocation slip, stacking faults, twins, and martensitic transformation. Lower temperatures promote martensite, raising strength though yield strength is little affected. Grain refinement of SUS304 to 0.3 $\mu$m (UFG-304) via multi-step cold rolling and heat treatment produced about 1 GPa yield strength at room temperature, followed by stress drop, Luders deformation, and uniform deformation with little hardening. In-situ neutron diffraction tensile tests revealed that yield strength rose to about 1.4 GPa at 77 K, with larger stress drops and reduced Luders strain. After Luders deformation, strong work hardening enabled significant elongation, with maximum strength reaching 1.9 GPa at 77 K. Mechanisms are discussed via neutron diffraction and will be detailed in the report.

  36. Low-temperature deformation testing system combined with digital image correlation for in-situ neutron diffraction International-presentation

    Kawasaki Takuro, Gong W., Ito Tatsuya, Aizawa Kazuya, Harjo S.

    2025 International HANARO Symposium; 20th Japan-Korea Meeting on Neutron Science

    More details Close

    The Engineering Materials Diffractometer (TAKUMI) at J-PARC MLF is a powerful instrument for investigating the relationship between the mechanical properties and microstructure of engineering materials such as steels, light metals, and alloys. To meet the increasing demand for materials with superior mechanical performance at low temperatures for hydrogen energy applications, a low-temperature deformation testing system combined with digital image correlation (DIC) has been developed at TAKUMI for in-situ neutron diffraction experiments. By integrating this system with a versatile horizontal load frame, tensile tests can be conducted over a wide temperature range from room temperature down to 20 K. The developed system enables accurate measurement of macroscopic strain, particularly in cases of non-uniform deformation, while simultaneously capturing associated crystallographic changes. This significantly enhances the value of neutron diffraction data for materials research. In this presentation, we introduce the system's design and performance, along with example results obtained from stainless steel tests.

  37. {\it In situ} neutron diffraction study on the influence of solute hydrogen on martensitic transformation in SUS316L under low-temperature deformation

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Shibata Akinobu*, Harjo S.

    日本鉄鋼協会第190回秋季講演大会

  38. Investigation of the effects of hydrogen on the strength and ductility of SUS310S steel by {\it in situ} neutron diffraction

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Okada Kazuho*, Shibata Akinobu*, Harjo S.

    M&M・CMD若手シンポジウム2025

  39. Sample environment equipment for engineering material studies at J-PARC MLF International-presentation

    Kawasaki Takuro, Gong W., Ito Tatsuya, Aizawa Kazuya, Harjo S.

    International Conference on Neutron Scattering (ICNS 2025)

    More details Close

    The Engineering Materials Diffractometer (TAKUMI) at the J-PARC MLF is a powerful tool for investigating the relationship between the mechanical properties and structure of engineering materials, such as steels, light metals, and alloys. A primary technique employed at TAKUMI involves in-situ neutron diffraction measurements during deformation tests. By correlating applied stress and strain with changes in lattice strain, texture, phase transformation, and dislocation density, researchers can elucidate the underlying mechanisms governing material strength and ductility. To enhance these studies, a suite of equipment is available, including deformation testing machines, temperature control systems, electric field generators, Euler cradles for texture analysis, and acoustic emission and thermography systems for concurrent property evaluation. At TAKUMI, to meet the growing demand for materials with superior mechanical properties at low temperatures for hydrogen energy applications, we have developed a low-temperature deformation testing system combined with digital image correlation for in-situ neutron diffraction experiments. This system enables precise measurement of deformation and strain localization in materials at cryogenic temperatures. This presentation will highlight the capabilities of this system and introduce other sample environment equipment available at J-PARC MLF for engineering materials research.

  40. {\it In situ} neutron diffraction study of stacking fault energy in hydrogen-charged Type 310S austenitic steel at low temperatures International-presentation

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Shibata Akinobu*, Harjo S.

    ASTM Conference on Hydrogen in Materials

    More details Close

    Stacking fault energy ($\gamma_{\mathrm{SF } }$) plays a crucial role in various deformation processes of austenitic steel, such as dislocation motion, deformation twinning, and martensitic transformation. Several previous studies have reported that hydrogen reduces $\gamma_{\mathrm{SF } }$. However, our recent in situ neutron diffraction experiment has shown that hydrogen has minimal effect on the $\gamma_{\mathrm{SF } }$ of Fe-24Cr-19Ni (AISI Type 310S) steel during tensile deformation at room temperature, despite significant reductions in $\gamma_{\mathrm{SF } }$ due to hydrogen reported for a similar composition steel. Moreover, a recent study analyzing the work-hardening behavior of several hydrogen-charged austenitic stainless steels has suggested that hydrogen may have only a limited impact on $\gamma_{\mathrm{SF } }$. These findings indicate the need for further research to clarify the influence of hydrogen on $\gamma_{\mathrm{SF } }$. In this study, we investigated the effect of hydrogen on the $\gamma_{\mathrm{SF } }$ of Type 310S austenitic steel at low temperatures using in situ neutron diffraction.

  41. The Role of hydrogen in enhancing the mechanical properties of 310S-type stainless steel monitored by neutron diffraction International-presentation

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Okada Kazuho*, Shibata Akinobu*, Harjo S.

    20th International Conference on Strength of Materials (ICSMA20)

    More details Close

    The mechanisms of hydrogen charging in a 310S-type austenitic stainless steel, which promote strengthening and twinning, were investigated, along with the evaluation of dislocation and stacking fault evolution using in situ neutron diffraction during deformation. The hydrogen-charged sample exhibited increased yield stress, flow stress, and uniform elongation, consistent with previous studies. However, the effect of solute hydrogen on dislocation and stacking fault evolution was found to be minimal, in contrast to earlier reports suggesting that hydrogen promotes their formation to facilitate twinning. Further details will be presented and discussed.

  42. None Invited

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Okada Kazuho*, Shibata Akinobu*, Harjo S.

    日本鉄鋼協会2025年春季大会(第189回); シンポジウム「量子ビーム関連技術による材料組織解析; 実空間と逆空間のブリッジングを目指して」

  43. Status of the engineering material diffractometer TAKUMI 2024

    Kawasaki Takuro, Ito Tatsuya, Gong W., Harjo S.

    日本中性子科学会第24回年会

  44. Analysis of the deformation mechanism of hydrogen-charged SUS310S using the Engineering Material Diffractometer "TAKUMI"

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Okada Kazuho*, Shibata Akinobu*, Harjo S.

    日本中性子科学会第24回年会

  45. The Elucidation of deformation behavior in ultrafine-grained 304 stainless steel by in situ neutron diffraction

    Mao W.*, Ito Tatsuya, Gong W., Kawasaki Takuro, Harjo S.

    日本中性子科学会第24回年会

  46. Understanding microstructure-mechanical properties correlation in extreme environments; An In-situ neutron diffraction study

    Gong W., Ito Tatsuya, Kawasaki Takuro, Harjo S.

    日本金属学会2024年秋期(第175回)講演大会

  47. Stacking fault probabilities in hydrogen-charged SUS310S steel during low temperature deformation

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Kawasaki Takuro, Shibata Akinobu*, Harjo S.

    日本鉄鋼協会2024年秋季大会(第188回)

  48. Deformation behavior of ultrafine-grained austenitic steel at low temperatures

    Mao W.*, Ito Tatsuya, Gong W., Kawasaki Takuro, Harjo S., Gao S.*, Tsuji Nobuhiro*

    日本金属学会2024年秋期(第175回)講演大会

  49. In situ neutron diffraction analysis of the deformation mechanism in Hydrogen-charged Fe-24Cr-19Ni-based austenitic stainless steel International-presentation

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Mao W.*, Kawasaki Takuro, Okada Kazuho*, Shibata Akinobu*, Harjo S.

    24th European Conference on Fracture (ECF24)

    More details Close

    Hydrogen is being considered as an alternative energy carrier to fossil fuels to achieve the goal of Carbon Neutrality. While hydrogen has historically been associated with causing steel embrittlement, Ogawa et al. reported that the introduction of hydrogen to a Fe-24Cr-19Ni-based (mass\%) austenitic stainless steel (AISI Type 310S) enhances both strength and ductility, thus counteracts the embrittlement effect. Although this phenomenon was qualitatively explained by the hydrogen-induced solid-solution strengthening and the promotion of deformation twinning, the influence of hydrogen on the development of dislocations and stacking faults ({\it i.e.}, twin nuclei) during deformation remains less understood. The aim of this work is to investigate the effects of hydrogen on the evolution of these crystal defects and overall deformation mechanisms by using {\it in situ} neutron diffraction measurements.

  50. Pulsed neutron diffractometer for materials engineering studies at J-PARC International-presentation

    Kawasaki Takuro, Gong W., Ito Tatsuya, Harjo S.

    32nd International Materials Research Congress (IMRC2024)

    More details Close

    Neutrons offer a unique capability to probe stresses and crystallographic microstructures within engineering materials, thanks to their significant penetrating power and the ability to discern atomic arrangements through diffraction techniques. Pulsed neutron diffraction, employing the time-of-flight method, stands out for its capacity to provide microscopic structural insights, capturing bulk average behaviors via simultaneous measurement of multiple Bragg peaks. Detailed analysis of these peaks within a neutron diffraction pattern unveils crucial structural aspects of sample materials, including internal stresses, phase conditions, dislocations, and texture. The substantial penetrating power of neutrons facilitates in-situ investigations of crystallographic information within engineering materials across diverse environments. This presentation will provide an overview of a diffractometer at J-PARC dedicated for the above purposes, along with highlighting some notable achievements.

  51. Deformation induced martensitic transformation in metastable steels at room temperature and low temperature monitored by neutron diffraction International-presentation

    Harjo S., Mao W.*, Gong W., Kawasaki Takuro, Ito Tatsuya

    1st International Workshop on Neutron Techniques for Additive Manufacturing (NAMOR 2024)

    More details Close

    Additive manufacturing (AM) has emerged as a prominent topic within metallic materials, encompassing a wide range of applications. During the AM process, materials undergo cyclic heating and cooling, resulting in an inherently heterogeneous microstructure or materials exhibiting distinct microstructural characteristics compared to conventionally manufactured counterparts. For example, maraging steel produced via AM often exhibits a significant presence of retained austenite, while AM-produced stainless steel may demonstrate lower stability of austenite, compared to the conventional manufactured ones. In the presentation, we will provide a brief introduction to the neutron diffraction method, as well as an overview of our in situ studies focusing on the deformation of metastable steels. These studies encompass investigations conducted at both room temperature and low temperature.

  52. Investigation of the effects of solute hydrogen on the deformation behavior of SUS310S {\it via} in situ neutron diffraction

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Mao W., Kawasaki Takuro, Okada Kazuho*, Shibata Akinobu*, Harjo S.

    日本鉄鋼協会2024年春季大会(第187回)

  53. Pulsed neutron diffractometer for engineering materials studies in J-PARC International-presentation

    Gong W., Kawasaki Takuro, Mao W., Ito Tatsuya, Harjo S.

    4th Asia-Oceania Conference on Neutron Scattering (AOCNS 2023)

    More details Close

    Neutrons are used to investigate stresses and crystallographic microstructures inside engineering materials, taking advantage of their large penetrating power and the ability to see the arrangement of atoms by diffraction methods. A pulsed neutron diffractometer has been developed in J-PARC and operated for more a decade. The present status of the diffractometer and some highlights will be introduced.

  54. In-situ studies on microstructures and mechanical properties in metallic materials using pulsed neutron diffraction at TAKUMI International-presentation

    Gong W., Kawasaki Takuro, Mao W., Ito Tatsuya, Aizawa Kazuya, Harjo S.

    11th Pacific Rim International Conference on Advanced Materials and Processing (PRICM11)

    More details Close

    Mechanical properties, as the principal properties of structural metallic materials, are governed by the microstructures. To track the structure-property relationship associated with various solid-solid reactions such as phase transformation and plastic deformation, is crucial for the development of structural metallic materials. TAKUMI, an engineering materials neutron diffractometer at MLF, J-PARC, covering a large d-range with a good balance between high neutron flux and high resolution is reliable to investigate various dynamic phenomena associated with microstructure evolution and deformation behavior. In addition, a variety of specifical sample environments at TAKUMI allow the in-situ studies under extreme environments such as cryogenic deformation (10K~), thermomechanical controlled process (~1473K), fatigue, etc. Crystallographic information including phase fraction, lattice strain (stress), texture, dislocation density, etc. as obtained by neutron diffraction can uniquely provide insights into microstructure evolution and deformation mechanisms in bulky materials. In the presentation, several recent studies on microstructure evolution and deformation mechanisms in metallic materials including steels, high-entropy alloys, magnesium alloys using in-situ neutron diffraction via TAKUMI will be introduced.

  55. In situ neutron diffraction study on deformation behavior of hydrogen-charged SUS310S austenitic steel International-presentation

    Ito Tatsuya, Ogawa Yuhei*, Gong W., Mao W., Kawasaki Takuro, Okada Kazuho*, Shibata Akinobu*, Harjo S.

    NIMS Award Symposium 2023

  56. Microstructure characterization through in situ neutron diffraction with diffractometer TAKUMI International-presentation

    Gong W., Kawasaki Takuro, Mao W., Ito Tatsuya, Harjo S.

    NIMS Award Symposium 2023

    More details Close

    Neutron diffraction, as a powerful microstructure probe, is reliable for tracking globally averaged crystallographic information associated with microstructure evolution and deformation behavior in structural materials. TAKUMI, is a neutron diffractometer for engineering materials studies at MLF, J-PARC, covering a wide d-range with a good balance between high neutron flux and high resolution. Additionally, a variety of specific sample environments at TAKUMI enable the in situ studies under extreme conditions, such as cryogenic deformation (10K$\sim$), thermomechanical controlled processes ($\sim$1473K), fatigue, etc. Crystallographic information including phase fraction, lattice strain (stress), texture, dislocation density, stacking fault probability, etc., obtained by neutron diffraction can uniquely provide insights into microstructure evolution and deformation mechanisms in bulky materials. Various in situ studies on various metallic materials, as well as ex situ measurements, such as residual stress mapping and microstructure characterization for specific purposes, have been conducted. In the presentation, the specifications of the diffractometer TAKUMI and several recent studies on deformation mechanisms in metallic materials using in situ neutron diffraction will be introduced.

  57. Excellent combination of strength and ductility of an ultrafine-grained stainless steel at cryogenic temperatures studied by in situ neutron diffraction International-presentation

    Mao W., Gao S.*, Gong W., Kawasaki Takuro, Ito Tatsuya, Harjo S.

    NIMS Award Symposium 2023

    More details Close

    The yield strengths of traditional austenitic stainless steels (ASSs), such as 304 ASS, remain relatively low at cryogenic temperatures, due to the face-centered cubic crystal structure. Recent studies reveal that ultrafine-grain (UFG) refinement of 304 ASS can be easily achieved by heavy cold-rolling and subsequent annealing. Compared to conventional 304 ASS with coarse grains, at room temperature, the UFG 304 ASS has significantly higher yield strength owing to the grain refinement strengthening, while it still maintains good ductility. However, the low-temperature mechanical properties of UFG 304 ASS are still unclear. In this study, we systematically investigated the tensile deformation behavior of an UFG 304 ASS at different temperatures ranging from 77 to 295 K. The results showed that the optimal mechanical properties were achieved at 77 K, with extremely high yield strength and ultimate tensile strength as well as a relatively good elongation. The low-temperature deformation mechanism of UFG 304 ASS was discussed in light of in situ neutron diffraction and microstructure observation.

  58. Highlighted studies of engineering materials at TAKUMI of J-PARC in 2022

    Harjo S., Gong W., Kawasaki Takuro, Mao W., Ito Tatsuya

    日本中性子科学会第23回年会

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Industrial Property Rights 2

  1. 磁気抵抗材料及びその製造方法

    貝沼 亮介, 大森 俊洋, 許 皛, 伊東 達矢, 槙 智仁

    Property Type: Patent

  2. 磁歪材料及びその製造方法

    貝沼 亮介, 大森 俊洋, 許 皛, 伊東 達矢, 槙 智仁

    Property Type: Patent

Research Projects 6

  1. 極限温度対応型形状記憶合金－極低温からの合金設計と材料開発－

    大森 俊洋, 許 皛, 許 勝, 伊東 達矢

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(S)

    Institution: 東北大学

    2026/04 - 2031/03

  2. その場中性子回折による応力中の積層欠陥エネルギー評価方法の検討と水素の影響

    伊東 達矢

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 若手研究

    Institution: 国立研究開発法人日本原子力研究開発機構

    2025/04/01 - 2028/03/31

  3. 水素がオーステナイト鋼の積層欠陥エネルギーに与える影響の再評価

    伊東 達矢

    Offer Organization: 日本鉄鋼協会

    System: 第34回鉄鋼研究振興助成

    2025/04 - 2027/03

  4. 液体水素環境で高強度・高延性を有する鉄鋼材料の開発と変形機構解明

    伊東 達矢

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 研究活動スタート支援

    Institution: 国立研究開発法人日本原子力研究開発機構

    2023/08/31 - 2025/03/31

  5. その場中性子回折による、水素チャージを施した鉄鋼材料の極低温における変形メカニズムの解明

    伊東 達矢

    Offer Organization: 池谷科学技術振興財団

    System: 単年度研究助成

    Institution: 日本原子力研究開発機構

    2024/04 - 2025/03

  6. 高ネール温度を有する新規ｂｃｃ型反強磁性合金の開発

    伊東 達矢

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東北大学

    2020/04/24 - 2023/03/31

    More details Close

    2021年度は、種々の合金組成を有するCu-Mn-Al合金を作製し、規則-不規則変態と磁気特性について調査を行った。その結果、当初の目的であるB2構造を主要な相とする試料の作成に成功した。そこで、得られた試料を用いて中性子回折実験を行い、磁気特性について詳細な調査を行った。更に、組成探索の最中、これまで発見されてこなかった領域で新たにマルテンサイト変態を発見した。そこで、機械特性について調査を行い、当該組成域で初めて実験的に形状記憶効果を見出した。これらの結果より、本合金は磁性材料としてだけではなく、カップリング材料など新たな分野でも応用できる可能性があることが示唆された。これらの内容について国際学会で口頭発表を行った。 更に、昨年度発見した特異な相変態を示す新規Pd-Mn基合金について、磁気特性や結晶構造などの詳細な相変態挙動について、平行して調査を行った。その結果、変態によるエネルギーロスが極めて小さなマルテンサイト変態が生じていることが分かった。更に、本合金の相変態は磁場の印加により誘起させることができ、磁場誘起相変態を利用して磁歪特性を得ることができることが分かった。従って、磁場誘起相変態を利用した省エネルギーな機能性材料として応用できる可能性がある。これらの内容について国内学会および国際学会で口頭発表を行った。 今後はこれまでに実験で得られた結果をもとに投稿論文としてまとめ、発表を行う予定である。

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Teaching Experience 1

  1. 材料科学総合実験　東北大学

Media Coverage 4

  1. 水素で強度、延性向上 原子力機構が仕組み解明

    電気新聞

    2025/04/03

    Type: Newspaper, magazine

  2. "悪者"水素が味方に：中性子が明かす金属の強度・延性向上メカニズム - 水素に強い金属材料を開発し、より安全な水素社会を目指す -

    J-PARCセンター プレスリリース

    2025/04

    Type: Other

  3. 磁場で動く低温用形状記憶合金を開発 - 磁歪材料やアクチュエーターのエネルギーロスを約1/100に！ -

    東北大学プレリリース 研究成果発表web

    2023/06

    Type: Other

  4. 東北大と東大、新な形状記憶合金を開発 氷点下160度で損失100分の１

    日刊自動車新聞 電子版

    2023/06

    Type: Newspaper, magazine