Updated on 2026/04/28

写真a

 
MATSUMURA RYUTARO
 
Organization
Institute of Integrated Research Materials and Structures Laboratory Assistant Professor
Title
Assistant Professor
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Degree

  • Doctor of Engineering ( 2023.9   Tokyo Institute of Technology )

Research Interests

  • Kink strengthening

  • Kink deformation

  • LPSO Mg alloy

Research Areas

  • Nanotechnology/Materials / Metallic material properties

  • Nanotechnology/Materials / Structural materials and functional materials

Education

  • Tokyo Institute of Technology   School of Materials and Chemical Technology

    2020.4 - 2023.9

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    Country： Japan

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  • Tokyo Institute of Technology

    2014.4 - 2016.3

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    Country： Japan

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  • Aoyama Gakuin University   College of Science and Engineering   Department of Physics and Mathematics

    2010.4 - 2014.3

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    Country： Japan

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Research History

  • Institute of Science Tokyo   Institute of Integrated Research   Assistant Professor

    2024.10

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    Country：Japan

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  • Tokyo Institute of Technology   Institute of Innovative Research   Assistant Professor

    2024.4 - 2024.9

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  • Tokyo Institute of Technology   Institute of Innovative Research   Researcher

    2023.10 - 2024.3

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  • 古河電気工業株式会社   生産技術

    2016.4 - 2020.3

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Professional Memberships

Committee Memberships

  • 日本金属学会 関東支部   ヤングメタラジスト研究交流会 運営委員  

    2024.6   

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Papers

  • Effect of Ni concentration on self-accommodation microstructure of B19′ martensite in Ti–Ni alloys Reviewed

    Gen Hikosaka, Yohei Soejima, Yuri Shinohara, Ryutaro Matsumura, Minoru Nishida, Tomonari Inamura

    Acta Materialia   309   122105 - 122105   2026.5

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.actamat.2026.122105

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  • Geometric principle of material strengthening by kink interfaces Reviewed

    Ryutaro Matsumura, Tomonari Inamura

    Royal Society Open Science   13 ( 4 )   2026.4

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：The Royal Society  

    Abstract

    Kink strengthening is a phenomenon in which kink microstructures significantly enhance the mechanical properties of long-period stacking ordered (LPSO) Mg alloys. However, the fundamental mechanism of kink strengthening has long remained elusive. Herein, we demonstrate, through geometric analysis based on a rank-1 connection, that the strengthening mechanisms arise from geometric constraints imposed at the intersection between the slip deformation and the kink interface. When deformation is governed by a single slip system, maintaining the continuity of the deformation necessitates the formation of disclinations at the intersection and the migration of kink interfaces, termed cooperative deformation, both of which enhance the material strength. Notably, even a small incident slip can trigger significant plastic work through cooperative deformation. Conversely, when the transmitted slip is constrained by the incident slip, cooperative deformation is geometrically suppressed and strengthening arises solely from disclination. In this regime, the kink interface acts as a damping medium that attenuates slip. This geometric principle of strengthening is not unique to LPSO Mg alloys but is broadly generalizable to layered materials with restricted slip systems. Our findings provide a geometrically grounded framework for kink strengthening.

    DOI： 10.1098/rsos.252436

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  • Geometric accommodation of local incompatibility of parent/martensite interface by transformation-induced dislocations in Ti–Ni Reviewed

    Gen Hikosaka, Yuri Shinohara, Ryutaro Matsumura, Minoru Nishida, Tomonari Inamura

    Materialia   45   102624 - 102624   2026.3

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.mtla.2025.102624

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  • Determination of Microscopic Habit Plane in B19′ Martensite of TiNi by Reverse-Transformation Surface Relief Analysis Reviewed

    Gen Hikosaka, Hiroshi Akamine, Ryutaro Matsumura, Minoru Nishida, Tomonari Inamura

    MATERIALS TRANSACTIONS   67 ( 2 )   162 - 166   2026.2

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    Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

    DOI： 10.2320/matertrans.mt-m2025143

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  • Geometric modeling of kink-bands involving basal and prismatic slips in hexagonal crystal structures Reviewed

    Xueyu Zhang, Ryutaro Matsumura, Yuri Shinohara, Koji Hagihara, Tomonari Inamura

    Acta Materialia   296   121304 - 121304   2025.9

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.actamat.2025.121304

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  • Lattice Parameters of B2 and B19′ Phases in Ti–Ni Alloys Near Transformation Temperatures: Effects of Ni Concentration and Temperature Reviewed

    Gen Hikosaka, Yuri Shinohara, Ryutaro Matsumura, Minoru Nishida, Tomonari Inamura

    Shape Memory and Superelasticity   2025.6

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    The Ni concentration and temperature dependence of the lattice parameters of the B2 and B19′ phases in binary Ti–Ni alloys was systematically clarified near the martensitic transformation temperatures, using samples with finely varied Ni concentrations ranging from 50.00 to 51.00 at.%. The differences between the present data and previously reported values were quantitatively explained and reinterpreted in terms of uncertainties in Ni concentration, measurement conditions, thermal history, and extrapolation methods. Furthermore, based on the lattice parameters obtained in this study, the effect of Ni concentration on the suppression of transformation-induced dislocations and the stabilization of thermal cycling behavior was discussed in terms of geometrical incompatibility. From the perspectives of composition increment, temperature steps, consistency in thermal history, and transparency of extrapolation procedure, the present dataset is considered to be among the most accurate, precise, and consistent lattice parameter datasets currently available. This dataset provides a highly reliable basis for evaluating the variation in lattice parameters among literature and serves as a foundation for future investigations into phase transformation behavior in Ti–Ni alloys.

    DOI： 10.1007/s40830-025-00546-9

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    Other Link： https://link.springer.com/article/10.1007/s40830-025-00546-9/fulltext.html

  • Origin of bent ridge-kink based on disclination relaxation Reviewed

    Xueyu Zhang, Ryutaro Matsumura, Yuri Shinohara, Tomonari Inamura

    International Journal of Solids and Structures   298   112829 - 112829   2024.7

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.ijsolstr.2024.112829

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  • Verification of Rank-1 Connection Model of Kink Band in Mg–Zn–Y Alloy Reviewed

    Ryutaro Matsumura, Koji Hagihara, Tomonari Inamura

    MATERIALS TRANSACTIONS   65 ( 1 )   97 - 100   2024.1

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

    DOI： 10.2320/matertrans.mt-m2023143

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  • Emergence of Disclination and Cooperative Deformation at the Intersection of Kink Interface and Slip Deformation Reviewed

    Ryutaro Matsumura, Tomonari Inamura

    MATERIALS TRANSACTIONS   65 ( 1 )   105 - 108   2024.1

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

    DOI： 10.2320/matertrans.mt-m2023168

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  • Local Plastic Deformation of Kink Band Opposing External Stress in Mg–Zn–Y Alloy Reviewed

    Ryutaro Matsumura, Yuri Ueda, Koji Hagihara, Yuri Shinohara, Tomonari Inamura

    MATERIALS TRANSACTIONS   65 ( 1 )   101 - 104   2024.1

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

    DOI： 10.2320/matertrans.mt-m2023155

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  • Numerical Analysis of Disclinations in Connecting Kink Bands Formed by Multiple Basal Shear Reviewed

    Ryutaro Matsumura, Yuri Shinohara, Tomonari Inamura

    MATERIALS TRANSACTIONS   64 ( 4 )   817 - 826   2023.4

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

    DOI： 10.2320/matertrans.mt-md2022020

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MISC

Presentations

  • γ grain size dependence of variant pairing in thin plate martensite

    Yugo Eto, Nozomi Takahashi, Yuri Shinohara, Ryutaro Matsumura, Hiroyuki Kawata, Tomonari Inamura

    2024.9 

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  • Forward and Reverse Martensitic Transformation in Ti-Ni-based Alloy Satisfying the Triplet Condition

    Hikari Inoue, Akira Heima, Gen Hikosaka, Ryutaro Matsumura, Yuri Shinohara, Tomonari Inamura

    2024.9 

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  • Triplet condition in cubic-monoclinic martensitic transformation

    Ken Yoneda, Hikari Inoue, Ryutaro Matsumura, Tomonari Inamura

    2024.9 

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  • Geometry of cooperative deformation in kink microstructure

    Haruki Kawashima, Ryutaro Matsumura, Tomonari Inamura

    2024.9 

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  • Comprehensive understanding for rank-1 connection of habit plane variants

    Nozomi Takahashi, Ryutaro Matsumura, Yuri Shinohara, Hiroyuki Kawata, Tomonari Inamura

    2024.9 

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  • キンク組織の変形の幾何学 Invited

    松村隆太郎

    2024年度 第二回軽金属学会「キンク研究部会」  2024.11 

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  • Disclination and cooperative deformation at penetrated kink interfaces by slip deformation

    Ryutaro Matsumura, Tomonari Inamura

    2024.9 

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  • Connection of kink bands formed by basal and prismatic slips

    Xueyu Zhang, Ryutaro Matsumura, Yuri Shinohara, Tomonari Inamura

    2024.9 

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  • In-situ Observation of Lath Martensitic Transformation in Fe-Ni-Cr-C Alloy

    Wataru Aoki, Nozomi Takahashi, Ryutaro Matsumura, Yuri Shinohara, Hiroyuki Kawata, Tomonari Inamura

    2024.9 

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  • In-situ observation of the formation of lath martensite microstructure in Fe-Ni-Cr-C alloy

    Wataru Aoki, Nozomi Takahashi, Ryutaro Matsumura, Yuri Shinohara, Hiroyuki Kawata, Tomonari Inamura

    International Conference on Martensitic Transformations  2025.9 

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  • Supression of transformation-induced dislocations in supercompatible martensite microstructure satisfying the triplet condition in Ti-Ni based alloys

    Tomonari Inamura, Akira Heima, Francesco Delta Porta, Hikari Inoue, Ryutaro Matsumura, Yuri Shinohara, Hiroshi Akamine, Minoru Nishida, Fumiyoshi Yamashita, Sumio Kise

    International Conference on Martensitic Transformations  2025.9 

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  • Slip system selection rule of transformation-induced dislocations based on geometric accommodation of incompatibility in Ti–Ni alloys

    Gen Hikosaka, Yuri Shinohara, Ryutaro Matsumura, Minoru Nishida, Tomonari Inamura

    2025.9 

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  • Elastic energy of disclinations and plastic work by cooperative deformation at sheared kink interface

    Ryutaro MATSUMURA, Tomonari INAMURA

    2025.9 

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  • Geometry of cooperative deformation in kink microstructure including asymmetric tilt boundaries

    Haruki KAWASHIMA, Ryutaro Matsumura, Tomonari Inamura

    2025.9 

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  • Fe-Ni-Cr-C合⾦におけるラスマルテンサイト組織形成のその場観察及び幾何学的解析

    青木渉, 松村隆太郎, 稲邑朋也

    日本鉄鋼協会第191回春季講演大会  2026.3 

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Awards

  • Seiichi Tejima Research Award

    2025.3   Institute of Science Tokyo  

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  • 新学術領域研究「ミルフィーユ構造の材料科学」年次報告会，優秀発表賞

    2023.3  

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  • LPSO/MFS2022 Best Poster Awards, LPSO/MFS 2022

    2022.12  

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  • 日本金属学会 2021 年春季講演大会 第 36 回優秀ポスター賞

    2021.3  

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Research Projects

  • 変形挙動解析と幾何学解析によるキンク強化機構の解明

    2025.4 - 2026.3

    公益社団法人 池谷科学技術振興財団  2025年度 単年度研究助成 

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  • 変形挙動解析と幾何学理論に基づくキンクによる強化機構の解明

    2024.9 - 2026.9

    公益社団法人 日本金属学会  第５回フロンティア研究助成 

    松村隆太郎

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Teaching Experience

  • Metallic Materials Frontier

    2024.10 Institution：Institute of Science Tokyo

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  • Metallurgical Engineering Laboratory Ⅲ

    2024.10 Institution：Institute of Science Tokyo

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  • Metallurgical Engineering Laboratory Ⅱ

    2024.10 Institution：Institute of Science Tokyo

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  • Metallurgical Engineering Laboratory Ⅰ

    2024.4 Institution：Institute of Science Tokyo

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