ハイエントロピー合金新学術領域研究の連携的な運営と統括

• Project Area: High Entropy Alloys - Science of New Class of Materials Based on Elemental Multiplicity and Heterogeneity
• Project/Area Number: 23H05419
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyoto University
• Principal Investigator: 乾 晴行 京都大学, 工学研究科, 教授 (30213135)
• Co-Investigator(Kenkyū-buntansha): 加藤 秀実 東北大学, 金属材料研究所, 教授 (80323096) ; 尾方 成信 大阪大学, 大学院基礎工学研究科, 教授 (20273584) ; 小山 敏幸 名古屋大学, 工学研究科, 教授 (80225599) ; 辻 伸泰 京都大学, 工学研究科, 教授 (30263213) ; 古原 忠 東北大学, 金属材料研究所, 教授 (50221560)
• Project Period (FY): 2023-04-01 – 2024-03-31
• Project Status: Completed (Fiscal Year 2023)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2023: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
• Keywords: ハイエントロピー合金 / 研究成果 / アーカイブ化 / 情報発信 / ニュースレター

Outline of Research at the Start

新学術領域研究「ハイエントロピー合金：元素の多様性と不均一性に基づく新しい材料の学理」で5年間，活発な研究活動を行った結果，FCC, BCC型ハイエントロピー合金の異常な力学特性の発現メカニズムが解明され，更に高性能の力学特性を得るための方策も提唱され，種々の特異な力学特性や機能特性が発見された．プロジェクトの成果は多岐にわたり，ハイエントロピー合金新学術領域の総括班メンバー6名（領域代表者と各計画研究の研究代表者）がそれぞれ役割分担を行なって，プロジェクトから生まれた研究成果の電子アーカイブ化，社会一般への成果の情報発信，英文図書の発行，国際ワークショップの開催等を行う．

Outline of Annual Research Achievements

新学術領域研究「ハイエントロピー合金：元素の多様性と不均一性に基づく新しい材料の学理」で5年間，活発な研究活動を行った結果，FCC, BCC型ハイエントロピー合金の異常な力学特性の発現メカニズムが解明され，更に高性能の力学特性を得るための方策も提唱され，種々の特異な力学特性や機能特性が発見された．
この終了研究は，ハイエントロピー合金新学術領域の総括班メンバー6名（領域代表者と各計画研究の研究代表者）により構成されており，それぞれ役割分担を行なって下記の取りまとめと総括を実施した．
①研究成果の電子アーカイブ化：プロジェクトから生まれた研究成果（学術雑誌論文，国際会議論文，国内・国際会議発表，解説・総説論文，著書、特許、受賞など）をリストとして取りまとめ，冊子体印刷を行ない，加えて，論文PDFまたはそれらへのリンクとともに電子アーカイブ化した．②成果の情報発信：論文特集号（日本結晶学会誌, 65巻(2023)第5号, Materials Transaction誌, 65巻(2024)第8号）やニュースレター最終版の発行など，とりまとめた成果の社会一般および学会への情報発信を行なった．③英文図書の発行：代表的な成果を取りまとめた英文図書を出版すべく，Nature-Springer社と交渉を進めている．④国際ワークショップの開催：オンラインを含めて2度の国際ワークショップを開催し，成果を海外研究者に示すとともに議論を深めた．
この終了研究は本年度で終了するが，我が国のハイエントロピー合金に関する高い研究力を維持するため，上記の取り組みを継続する予定である．

Research Progress Status

令和5年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和5年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] バイロイト大学(ドイツ)
• [Int'l Joint Research] 台湾国立清華大学(その他の国・地域)
• [Int'l Joint Research] 浦頂工科大学(韓国)
• [Journal Article] Alloying Effects on the Microstructure of Fe-1mass%M Binary Alloys Treated by Austenitic Nitriding and Quenching Treatment (2024)
  • Author(s): Kubo Hironori、Miyamoto Goro、Tagashira Satoshi、Furuhara Tadashi
  • Journal Title: ISIJ International Volume: 64 Issue: 2 Pages: 226-234
  • DOI: 10.2355/isijinternational.ISIJINT-2023-260
  • ISSN: 0915-1559, 1347-5460
  • Year and Date: 2024-01-30
  • Peer Reviewed / Open Access
• [Journal Article] Multi-aspect Characterization of Low-temperature Tempering Behaviors in High-carbon Martensite (2024)
  • Author(s): Zhang Yongjie、Marusawa Kento、Kudo Kohei、Morooka Satoshi、Harjo Stefanus、Miyamoto Goro、Furuhara Tadashi
  • Journal Title: ISIJ International Volume: 64 Issue: 2 Pages: 245-256
  • DOI: 10.2355/isijinternational.ISIJINT-2023-251
  • ISSN: 0915-1559, 1347-5460
  • Year and Date: 2024-01-30
  • Peer Reviewed / Open Access
• [Journal Article] Variation of first pop-in loads in nanoindentation to detect chemical short-range ordering in the equiatomic Cr-Co-Ni medium-entropy alloy (2024)
  • Author(s): Li Le、Du Jun-Ping、Ogata Shigenobu、Inui Haruyuki
  • Journal Title: Acta Materialia Volume: 269 Pages: 119775-119775
  • DOI: 10.1016/j.actamat.2024.119775
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Intrinsic factors responsible for brittle versus ductile nature of refractory high-entropy alloys (2024)
  • Author(s): Tsuru Tomohito、Han Shu、Matsuura Shutaro、Chen Zhenghao、Kishida Kyosuke、Iobzenko Ivan、Rao Satish I.、Woodward Christopher、George Easo P.、Inui Haruyuki
  • Journal Title: Nature Communications Volume: 15 Issue: 1 Pages: 1706-1706
  • DOI: 10.1038/s41467-024-45639-8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Connection between Mechanical Relaxation and Equilibration Kinetics in a High-Entropy Metallic Glass (2024)
  • Author(s): Duan Y.J.、Nabahat M.、Tong Yu、Ortiz-Membrado L.、Jimenez-Pique E.、Zhao Kun、Wang Yun-Jiang、Yang Y.、Wada T.、Kato H.、Pelletier J.?M.、Qiao J.C.、Pineda E.
  • Journal Title: Physical Review Letters Volume: 132 Issue: 5
  • DOI: 10.1103/physrevlett.132.056101
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Solute influence in transitions from non-Arrhenius to stick-slip Arrhenius grain boundary migration (2024)
  • Author(s): Verma Akarsh、Johnson Oliver K.、Thompson Gregory B.、Ogata Shigenobu、Homer Eric R.
  • Journal Title: Acta Materialia Volume: 265 Pages: 119605-119605
  • DOI: 10.1016/j.actamat.2023.119605
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Highly deformable Laves phase in a high entropy alloy (2024)
  • Author(s): Ojha P.K.、Yoshida S.、Sunkari U.、Tripathy B.、Tsuji N.、Bhattacharjee P.P.
  • Journal Title: Scripta Materialia Volume: 240 Pages: 115828-115828
  • DOI: 10.1016/j.scriptamat.2023.115828
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Numerical Analysis of Precipitation Kinetics in Cu-Co-P Alloy Based on Dislocation Recovery Model and N Model (2023)
  • Author(s): Goto Jundai、Koyama Toshiyuki、Tajima Kazushige
  • Journal Title: Journal of the Japan Institute of Metals and Materials Volume: 87 Issue: 9 Pages: 258-266
  • DOI: 10.2320/jinstmet.J2023003
  • ISSN: 0021-4876, 1880-6880, 2433-7501
  • Year and Date: 2023-09-01
  • Peer Reviewed
• [Journal Article] Fe₂₀Mo₂₀Ni₂₀Rh₂₀Ru₂₀ and Fe₁₄Mo₃₅Ni₁₅Rh₁₅Ru₂₁ Ultrahigh-Mixing-Entropy Alloys with Single Hexagonal Close-Packed Structure (2023)
  • Author(s): Takeuchi Akira、Wada Takeshi、Amiya Kenji、Kato Hidemi、Nagase Takeshi
  • Journal Title: MATERIALS TRANSACTIONS Volume: 64 Issue: 4 Pages: 841-848
  • DOI: 10.2320/matertrans.MT-M2022213
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2023-04-01
  • Peer Reviewed / Open Access
• [Journal Article] Stabilization of Equiatomic Solutions Due to High-Entropy Effect (2023)
  • Author(s): Abe Taichi、Han Kwangsik、Goto Yumi、Ohnuma Ikuo、Koyama Toshiyuki
  • Journal Title: MATERIALS TRANSACTIONS Volume: 64 Issue: 4 Pages: 877-884
  • DOI: 10.2320/matertrans.MT-M2022167
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2023-04-01
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Plastic deformation of single crystals of the equiatomic Cr-Fe-Co-Ni medium entropy alloy - A comparison with Cr-Mn-Fe-Co-Ni and Cr-Co-Ni alloys (2023)
  • Author(s): Li Le、Chen Zhenghao、Yuge Koretaka、Kishida Kyosuke、Inui Haruyuki、Heilmaier Martin、George Easo P.
  • Journal Title: International Journal of Plasticity Volume: 169 Pages: 103732-103732
  • DOI: 10.1016/j.ijplas.2023.103732
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Partial liquid metal dealloying to synthesize nickel-containing porous and composite ferrous and high-entropy alloys (2023)
  • Author(s): Wada Takeshi、Geslin Pierre-Antoine、Wei Daixu、Kato Hidemi
  • Journal Title: Communications Materials Volume: 4 Issue: 1 Pages: 43-43
  • DOI: 10.1038/s43246-023-00374-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Diffusion bonding of high entropy alloy and stainless steel at a relative lower temperature via surface nano-crystallization treatment (2023)
  • Author(s): Gao Haitao、He Guiqiang、Li Qi、Li Yangen、Hu Wei、Zhou Shaojie、Liu Fengmei、Yi Jianglong、Zhang Yupeng、Cai Zhihong、Ogata Shigenobu、Qiao Lijie、Gao Lei
  • Journal Title: Journal of Materials Research and Technology Volume: 24 Pages: 475-487
  • DOI: 10.1016/j.jmrt.2023.03.026
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Thermodynamic and kinetic assessments in Co-Cr-Mn system using diffusion data (2023)
  • Author(s): Pendem Sri Pragna、Haoge Li、Ueshima Nobufumi、Oikawa Katsunari、Tsukada Yuhki、Koyama Toshiyuki
  • Journal Title: Journal of Materials Science Volume: 58 Issue: 38 Pages: 15196-15218
  • DOI: 10.1007/s10853-023-08927-0
  • Peer Reviewed / Open Access
• [Journal Article] Oxygen interstitials make metastable β titanium alloys strong and ductile (2023)
  • Author(s): Chong Yan、Gholizadeh Reza、Guo Baoqi、Tsuru Tomohito、Zhao Guohua、Yoshida Shuhei、Mitsuhara Masatoshi、Godfrey Andrew、Tsuji Nobuhiro
  • Journal Title: Acta Materialia Volume: 257 Pages: 119165-119165
  • DOI: 10.1016/j.actamat.2023.119165
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Superior strength-ductility synergy in three-dimensional heterogeneous-nanostructured metals (2023)
  • Author(s): Li Guodong、Jiang Jiaxi、Ma Huachun、Zheng Ruixiao、Gao Si、Zhao Shiteng、Ma Chaoli、Ameyama Kei、Ding Bin、Li Xiaoyan
  • Journal Title: Acta Materialia Volume: 256 Pages: 119143-119143
  • DOI: 10.1016/j.actamat.2023.119143
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] High-throughput investigation of Cr-N cluster formation in Fe-35Ni-Cr system during low-temperature nitriding (2023)
  • Author(s): Xie Yulin、Miyamoto Goro、Furuhara Tadashi
  • Journal Title: Acta Materialia Volume: in press Pages: 118921-118921
  • DOI: 10.1016/j.actamat.2023.118921
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 先進構造材料の結晶塑性における新展開 －ハイエントロピー合金を中心に (2024)
  • Author(s): 乾 晴行
  • Organizer: 日本金属学会2024年春期（第174回）講演大会
  • Invited
• [Presentation] Neural network potential-based molecular dynamics nanoindentation and machine learning-based kinetic Monte-Carlo simulations of the impact of chemical order in CrCoNi medium-entropy alloy (2024)
  • Author(s): Jun-Ping Du, Shigenobu Ogata
  • Organizer: TMS2024
  • Int'l Joint Research
• [Presentation] Impact of chemical ordering on sluggish diffusion in medium entropy alloys (2024)
  • Author(s): Shigenobu Ogata and Yangen Li
  • Organizer: TMS2024
  • Int'l Joint Research / Invited
• [Presentation] High Throughput Approaches for Sublattice Alloy Design of High Performance Nitriding Steels (2024)
  • Author(s): Tadashi Furuhara, Yulin Xie, Goro Miyamoto
  • Organizer: TMS2024
  • Int'l Joint Research / Invited
• [Presentation] Single-Crystal Mechanical Properties of High- and Medium-Entropy Alloys with the FCC Structure (2023)
  • Author(s): Haruyuki Inui
  • Organizer: 2023 MRS
  • Int'l Joint Research / Invited
• [Presentation] Plastic deformation of single crystals of high- and medium-entropy alloys with the FCC structure (2023)
  • Author(s): Haruyuki Inui
  • Organizer: THERMEC’2023
  • Int'l Joint Research / Invited
• [Presentation] Single-crystal mechanical properties of high- and medium-entropy alloys with the FCC structure (2023)
  • Author(s): Haruyuki Inui, Kyosuke Kishida, Zhenghao Chen and Le Li
  • Organizer: Beyond Nickel-Based Superalloys IV (BNBS IV )
  • Int'l Joint Research / Invited
• [Presentation] Decoupling between thermodynamic and dynamic glass transition in high entropy metallic glasses (2023)
  • Author(s): Hidemi Kato
  • Organizer: The 9th International Discussion Meeting on Relaxations in Complex Systems (9 IDMRCS)
  • Int'l Joint Research / Invited
• [Presentation] 金属溶湯脱成分法を用いた金属の共連続ナノポー―ラス化と電解コンデンサへの応用 (2023)
  • Author(s): 加藤秀実
  • Organizer: 電気化学会第90回大会
  • Invited
• [Presentation] 発展方程式に基づく非線形パターン形成の起源解明 (2023)
  • Author(s): 小山敏幸
  • Organizer: 日本金属学会2023年秋期講演大会
  • Invited
• [Presentation] 不均一温度場における拡散現象のフェーズフィールド解析 (2023)
  • Author(s): 小山敏幸
  • Organizer: 日本金属学会2023年秋期講演大会
  • Invited
• [Presentation] Unique dynamic recrystallization behavior in HfNbTaTiZr equi-atomic BCC high entropy alloy (2023)
  • Author(s): Tsuji N., Eleti R.R., Chokshi A.H., Shibata A.
  • Organizer: The 8th International Conference on Recrystallization and Grain Growth
  • Int'l Joint Research / Invited
• [Presentation] Microstructural origin of high work-hardening ability in ultrafine-grained CoCrNi medium entropy alloy (2023)
  • Author(s): Yoshida, S., Yamashita, G., Ikeuchi, T., Bai, Y., Shibata, A., Tsuji, N.
  • Organizer: EUROMAT 2023
  • Int'l Joint Research
• [Presentation] Sublattice alloy design for application of solute clustering in high-strength steels (2023)
  • Author(s): Tadashi Furuhara, Yongjie Zhang, Mitsutaka Sato, Goro Miyamoto
  • Organizer: THERMEC’2023
  • Int'l Joint Research / Invited
• [Remarks] 領域ホームページ
  • URL: https://highentropy.mtl.kyoto-u.ac.jp/
• [Remarks] 京都大学大学院工学研究科材料工学専攻 乾 研究室
  • URL: http://imc.mtl.kyoto-u.ac.jp/
• [Funded Workshop] International Workshop of High Entropy Alloy Ⅱ (2023)
• [Funded Workshop] International Workshop of High Entropy Alloy Ⅲ (2023)