基本情報

学部兼担

• 工学部

学位

• 修士(工学)(京都大学)
• 博士(工学)(京都大学)

ID,URL

• J-Global ID

  201701008380416443

researchmap URL

• https://researchmap.jp/7000021617

研究

研究テーマ・研究概要

• 研究テーマ

  金属材料の力学特性、Dual Phase鋼、構造材料、複合組織、不均一変形、局所応力・局所ひずみ解析、弾塑性力学

• 研究概要

  高強度・高延性の両立が構造材料において第一の目標であり、その実現のために様々な研究が従来から活発に成されていた。しかし強度と延性は一般的にトレードオフの関係にあり、両立は困難である。しかし、従来には破壊の起点となりうるため忌避していた介在物を積極的に利用することにより、強度・延性バランスが大きく改善されることが近年分かり始めている。本研究では材料の不均一さの定量化とともにマクロ・ミクロ不均一変形と力学特性の関係を明確にすることを目的とする。

研究分野

• ナノテク・材料, 金属材料物性

論文

• Role of twin boundary and martensitic transformation in strain partitioning and damage initiation in a metastable medium entropy alloy

  Wujun Yin; Li Liang; Fabien Briffod; Si Gao; Myeong-heom Park; Jiyun Kang; Haoyu Hu; Takayuki Shiraiwa; Manabu Enoki; Nobuhiro Tsuji

  Acta Materialia, 2026年08月

  
• Yttrium improves Mg ductility by enhancing grain-boundary strain compatibility: Mesoscopic deformation analysis

  Myeong-heom Park; Binxuan Sun; Saho Yako; Akinobu Shibata; Nobuhiro Tsuji

  Journal of Materials Research and Technology, 2026年05月

  
• Dynamics of Portevin-Le Chatelier banding revealed through grain refinement in high-Mn austenitic steel: Sequential overcoming of necking

  Sukyoung Hwang; Myeong-heom Park; Yu Bai; Takumi Suzumura; Ryo Asada; Avala Lavakumar; Jesada Punyafu; Akinobu Shibata; Hiroki Adachi; Toshiyuki Fujii; Nobuhiro Tsuji

  Journal of Materials Science & Technology, 2026年05月

  
• Origin of the trade-off relationship between tensile strength and hydrogen embrittlement resistance

  Kazuho Okada; Yukihisa Watase; Myeong-heom Park; Kaneaki Tsuzaki; Akinobu Shibata

  Acta Materialia, 2026年01月

  
• Grain size-dependent Lüders band dynamics in low-carbon steels: Combined insights from digital image correlation and in-situ synchrotron X-ray diffraction

  Myeong-heom Park; Si Gao; Nobuhiro Tsuji

  Materials Science and Engineering: A, 2025年12月

  
• Compositional requirements for the synthesis of Fe–Mn–C austenite-martensite composites: Beyond local equilibrium considerations in pearlite formation

  Marcel Muench; Reza Gholizadeh; Myeong-heom Park; Nobuhiro Tsuji; Martin Peterlechner; Yolita M. Eggeler; Jan L. Riedel; Michael K. Eusterholz; Martin Heilmaier; Alexander Kauffmann

  Journal of Materials Research and Technology, 2025年11月

  
• Grain size effects on strain localization and fracture behavior in ferrite–martensite dual-phase steels characterized by digital image correlation analysis

  Myeong-heom Park; Yuichi Tagusari; Akinobu Shibata; Nobuhiro Tsuji

  Journal of Materials Research and Technology, 2025年07月

  この論文にアクセスする：

  
• Grain refinement of dual phase steel maximizes deformation ability of martensite, leading to simultaneous enhancement of strength and ductility

  Myeong-heom Park; Akinobu Shibata; Stefanus Harjo; Nobuhiro Tsuji

  Acta Materialia, 2025年06月

  この論文にアクセスする：

  
• Unusual deformation behavior and the consequent emergence of Type C serrations in Fe-1.6Mn-2Ni-1.4Si-0.4C steels

  Myeong-heom Park; Sukyoung Hwang; Yoshitaka Okitsu; Nobuhiro Tsuji

  Scripta Materialia, 2025年04月

  
• Polymer-like double necking deformation in an FeCoCrV medium entropy alloy

  Myeong-heom Park

  Materials Research Letters, 2025年

  この論文にアクセスする：

  
• Loading-direction dependence of non-basal slip activity in a pre-twinned AZ31 magnesium alloy

  Myeong-heom Park

  Journal of Alloys and Compounds, 2025年

  
• Enhancing the precipitation hardening ability of Al-Mg-Ga-In-Sn alloy through low-temperature aging treatment

  Myeong-heom Park

  Journal of Alloys and Compounds, 2025年

  
• Quantitative evaluation of local strain distribution induced by deformation twins and triggering effect of deformation twinning on neighboring grains in polycrystalline AZ31 magnesium alloys

  Saho Yako; Myeong-heom Park; Nobuhiro Tsuji

  Scripta Materialia, 2025年01月

  
• Quantitative characterization of local deformation-fracture behavior in ferrite-martensite dual-phase steels with different martensite distributions

  Myeong-heom Park; Ryota Matsubayashi; Akinobu Shibata; Nobuhiro Tsuji

  Materials Science and Engineering: A, 2024年12月

  
• Effect of martensite hardness on mechanical properties and stress/strain-partitioning behavior in ferrite + martensite dual-phase steels

  Myeong-heom Park; Yuto Fujimura; Akinobu Shibata; Nobuhiro Tsuji

  Materials Science and Engineering: A, 2024年11月

  
• Making stress visible: A method to quantify local stress distribution in metals using digital image correlation method

  Myeong-heom Park; Saho Yako; Yasunari Takeda; Akinobu Shibata; Nobuhiro Tsuji

  Scripta Materialia, 2024年11月

  
• Strain localization behavior in a polycrystalline magnesium alloy with de-twinning

  Jongbin Go; Myeong-heom Park; Si Gao; Nobuhiro Tsuji

  Scripta Materialia, 2024年09月

  
• Real-time Observation of Stress-strain Behavior beyond Necking in Martensitic Steel by in-situ Synchrotron X-ray Diffraction

  Myeong-heom Park

  ISIJ International, 2024年

  この論文にアクセスする：

  
• Mechanism of DSA effect correlating to the macroscopic PLC banding in high-Mn austenitic steel

  Myeong-heom Park

  Scripta Materialia, 2024年

  
• Mechanism of simultaneous increase of strength and ductility with grain refinement in Si-added high-Mn austenitic steel

  Myeong-heom Park

  Materials Science and Engineering: A, 2024年

  
• Cyclic transformation strengthening in Fe-24Ni-0.3C metastable austenitic steel

  Myeong-heom Park

  Proceedings of International Symposia on Steel Science, 2024年

  
• Exploring unusual Lüders deformation in ultrafine-grained high-Mn austenitic steel

  Myeong-heom Park

  Materials Research Letters, 2024年

  
• Effect of Zr micro-alloying on microstructure refinement and mechanical property of CoCrNi medium-entropy alloy processed by high-pressure torsion and subsequent annealing

  Myeong-heom Park

  Journal of Materials Science, 2024年

  
• Quantitatively evaluating respective contribution of austenite and deformation-induced martensite to flow stress, plastic strain, and strain hardening rate in tensile deformed TRIP steel

  Wenqi Mao; Si Gao; Wu Gong; Yu Bai; Stefanus Harjo; Myeong-Heom Park; Akinobu Shibata; Nobuhiro Tsuji

  Acta Materialia, 2023年09月

  
• Unique microstructure formations during low-temperature partitioning after intercritical annealing in low alloy multi-phase TRIP steel and their mechanical behavior clarified by in-situ synchrotron X-Ray diffraction

  Avala Lavakumar; Myeong-heom Park; Reza Gholizadeh; Ranjit Kumar Ray; Mitsuhiro Murayama; Nobuhiro Tsuji

  Materials Science and Engineering: A, 2023年06月

  
• Mechanisms of types B and C serrations in the tensile flow curve of C-bearing high Mn steel

  Seon-Keun Oh; Myeong-heom Park; Young-Kook Lee

  Journal of Materials Research and Technology, 2023年05月

  
• Role of surrounding phases on deformation-induced martensitic transformation of retained austenite in multi-phase TRIP steel

  Avala Lavakumar; Myeong-heom Park; Sukyoung Hwang; Hiroki Adachi; Masugu Sato; Ranjit Kumar Ray; Mitsuhiro Murayama; Nobuhiro Tsuji

  Materials Science and Engineering: A, 2023年05月

  
• Characterization of local deformation and fracture behavior in ferrite + martensite dual-phase steels having different grain sizes

  M H Park; Y Tagusari; N Tsuji

  IOP Conference Series: Materials Science and Engineering, 2022年07月01日

  この論文にアクセスする：

  
• Effective grain size refinement of an Fe-24Ni-0.3C metastable austenitic steel by a modified two-step cold rolling and annealing process utilizing the deformation-induced martensitic transformation and its reverse transformation

  Wenqi Mao; Si Gao; Yu Bai; Myeong-heom Park; Akinobu Shibata; Nobuhiro Tsuji

  Journal of Materials Research and Technology, 2022年03月

  この論文にアクセスする：

  
• Unique transition of yielding mechanism and unexpected activation of deformation twinning in ultrafine grained Fe-31Mn-3Al-3Si alloy

  Yu Bai; Hiroki Kitamura; Si Gao; Yanzhong Tian; Nokeun Park; Myeong-heom Park; Hiroki Adachi; Akinobu Shibata; Masugu Sato; Mitsuhiro Murayama; Nobuhiro Tsuji

  Scientific Reports, 2021年08月05日

  
• Effects of local stress, strain, and hydrogen content on hydrogen-related fracture behavior in low-carbon martensitic steel

  Akinobu Shibata; Takashi Yonemura; Yuji Momotani; Myeong-heom Park; Shusaku Takagi; Yazid Madi; Jacques Besson; Nobuhiro Tsuji

  Acta Materialia, 2021年05月

  
• The mechanism of dynamic strain aging for type A serrations in tensile curves of a medium-Mn steel

  Jae-Hoon Nam; Seon-Keun Oh; Myeong-heom Park; Young-Kook Lee

  Acta Materialia, 2021年03月

  
• Mesoscopic nature of serration behavior in high-Mn austenitic steel

  Sukyoung Hwang; Myeong-heom Park; Yu Bai; Akinobu Shibata; Wenqi Mao; Hiroki Adachi; Masugu Sato; Nobuhiro Tsuji

  Acta Materialia, 2021年02月

  この論文にアクセスする：

  
• Tensile Deformation of Ultrafine-Grained Fe-Mn-Al-Ni-C Alloy Studied by In Situ Synchrotron Radiation X-ray Diffraction

  Si Gao; Takuma Yoshimura; Wenqi Mao; Yu Bai; Wu Gong; Myeong-heom Park; Akinobu Shibata; Hiroki Adachi; Masugu Sato; Nobuhiro Tsuji

  Crystals, 2020年12月07日

  
• Challenging Ultra Grain Refinement of Ferrite in Low-C Steel Only by Heat Treatment

  Myeong-heom Park; Akinobu Shibata; Nobuhiro Tsuji

  Frontiers in Materials, 2020年11月26日

  
• Linking local and heterogeneous deformation behavior to global deformation of materials by in-situ experimental techniques

  Nobuhiro Tsuji; Myeong-heom Park; Si Gao; Yu Bai; Yan Chong

  IOP Conference Series: Materials Science and Engineering, 2019年08月01日

  
• In-situ neutron diffraction study on the deformation of a TRIP-assisted multi-phase steel composed of ferrite, austenite and martensite

  A Lavakumar; M H Park; S Gao; A Shibata; Y Okitsu; W Gong; S Harjo; N Tsuji

  IOP Conference Series: Materials Science and Engineering, 2019年08月01日

  
• Factors determining room temperature mechanical properties of bimodal microstructures in Ti-6Al-4V alloy

  Yan Chong; Tilak Bhattacharjee; Myeong-Heom Park; Akinobu Shibata; Nobuhiro Tsuji

  Materials Science and Engineering: A, 2018年07月

  
• Reason for high strength and good ductility in dual phase steels composed of soft ferrite and hard martensite

  Daisuke Terada; Gosuke Ikeda; Myeong-heom Park; Akinobu Shibata; Nobuhiro Tsuji

  IOP Conference Series: Materials Science and Engineering, 2017年07月

  この論文にアクセスする：

  
• Post-uniform elongation and tensile fracture mechanisms of Fe-18Mn-0.6C-xAl twinning-induced plasticity steels

  Ha-Young Yu; Sang-Min Lee; Jae-Hoon Nam; Seung-Joon Lee; Damien Fabrègue; Myeong-heom Park; Nobuhiro Tsuji; Young-Kook Lee

  Acta Materialia, 2017年06月

  
• Cold-rolling and recrystallization textures of a nano-lamellar AlCoCrFeNi2.1 eutectic high entropy alloy

  I.S. Wani; T. Bhattacharjee; S. Sheikh; I.T. Clark; M.H. Park; T. Okawa; S. Guo; P.P. Bhattacharjee; N. Tsuji

  Intermetallics, 2017年05月

  
• Enhanced strength-ductility balance of AZ31 Mg alloy through single-pass hot-rolling and subsequent low-temperature annealing

  Jongbin Go; Saho Yako; Myeong-heom Park; Si Gao; Sangwon Lee; Reza Gholizadeh; Nobuhiro Tsuji

  MATERIALS LETTERS, 2026年07月15日

  
• Role of Detwinning on Macroscopic Strain Localization in Magnesium Alloy

  Jongbin Go; Myeong-heom Park; Si Gao; Saho Yako; Nobuhiro Tsuji

  Metallurgical and Materials Transactions A, 2025年07月20日

  この論文にアクセスする：

  

外部資金：科学研究費補助金

• 複合組織材におけるマクロ・ミクロ変形機構の解明

  若手研究

  小区分18010:材料力学および機械材料関連

  京都大学

  朴 明験

  自 2020年04月01日, 至 2024年03月31日, 完了

  不均一変形;局所変形;ひずみ解析;デジタル画像相関法;局所応力;弾性ひずみ;複相組織;塑性変形;応力可視化;金属材料;力学特性;画像相関法;変形;構造材料;応力

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20K14608/
• 透過電子顕微鏡中その場変形三次元観察法による金属組織塑性変形挙動定量評価の確立

  基盤研究(B)

  小区分18010:材料力学および機械材料関連

  九州大学

  村山 光宏

  自 2019年04月01日, 至 2022年03月31日, 完了

  ナノスケール計測・解析;構造用金属材料;透過型電子顕微鏡法;その場観察;実用金属材料の塑性変形;TEM中その場観察;三次元観察;転位;積層欠陥;電子顕微鏡中その場観察;微細組織解析;塑性変形挙動;透過電子顕微鏡;塑性変形ダイナミクス;破断ダイナミクス

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H02029/
• 変形機構の高次制御による超高強度・高延性金属の創成：実験＋計算二刀流人材の育成

  国際共同研究加速基金(国際先導研究)

  理工系

  京都大学

  辻 伸泰

  自 2023年11月17日, 至 2030年03月31日, 交付

  超高強度と高延性両立;金属材料;変形モード制御;加工硬化;原子シミュレーション;力学;国際共同研究;若手人材育成;超高強度;計算実験の二刀流;延性・靱性

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23K20037/
• 複相組織材における局所内部応力測定手法の確立と結晶粒微細化強化機構の解明

  基盤研究(C)

  小区分18010:材料力学および機械材料関連

  京都大学

  朴 明験

  自 2024年04月01日, 至 2028年03月31日, 交付

  塑性変形;不均一変形;デジタル画像相関法;応力可視化;局所応力;画像相関法;残留応力

  https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24K07214/

教育

担当科目

• 自 2025年04月01日, 至 2026年03月31日

  基礎化学実験

  N308, 前期, 国際高等教育院, 2