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Grain refinement and deformation behavior of non-equiatomic high entropy alloys

Research Project

Project/Area Number 17H03415
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Structural/Functional materials
Research InstitutionOsaka University

Principal Investigator

Yasuda Hiroyuki  大阪大学, 工学研究科, 教授 (60294021)

Co-Investigator(Kenkyū-buntansha) 趙 研  大阪大学, 工学研究科, 講師 (00633661)
永瀬 丈嗣  大阪大学, 超高圧電子顕微鏡センター, 准教授 (50362661)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2017: ¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Keywords構造・機能材料 / 社会基盤構造材料 / ハイエントロピー合金 / 転位 / 格子欠陥
Outline of Final Research Achievements

AlxCoCrFeNi and CoCr1+yFeNi1-yMn non-equiatomic fcc high entropy alloys with ultrafine-grained microstructure of which average grain sizes are 0.7μm and 1.4μm can be obtained through conventional cold rolling followed by recrystallization treatment. This is because the NiAl and sigma phases are precipitated rapidly along the grain boundaries of the fcc matrix and suppress the grain growth. As a result, an excellent balance between strength and ductility can be obtained by the thermomechanical treatment. The yield stress and grain size of the ultrafine-grained alloys satisfy the Hall-Petch relationship. Moreover, the grain growth behavior is in good agreement with the modified Zener-Smith model.

Academic Significance and Societal Importance of the Research Achievements

5種類以上の構成元素を等量配合するのではなく、あえて非等量配合とすることで、結晶粒界、せん断帯といった格子欠陥部に第2相を高速析出させ、そのピン止め効果により超微細粒を得る、というアイディアは、申請者が世界で初めて考案したものである。単純な圧延再結晶処理で超微細粒化が達成できる点が長所である。論文発表、国際会議発表を通じて、このアイディアは世界の知るところとなり、現在では、類似の研究に関する報告が後を絶たない。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (4 results)

All 2019 2018 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Grain refinement of non-equiatomic Cr-rich CoCrFeMnNi high-entropy alloys through combination of cold rolling and precipitation of σ phase2018

    • Author(s)
      Cho Ken、Fujioka Yumi、Nagase Takeshi、Yasuda Hiroyuki Y.
    • Journal Title

      Materials Science and Engineering: A

      Volume: 735 Pages: 191-200

    • DOI

      10.1016/j.msea.2018.08.038

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] AlxCoCrFeMnNiハイエントロピー合金の結晶粒微細化と析出挙動の解明2019

    • Author(s)
      本村陸央、趙研、安田弘行
    • Organizer
      日本金属学会2019年秋期大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Effect of NiAl precipitates on grain refinement in AlxCoCrFeNi high entropy alloys2018

    • Author(s)
      H. Y. Yasuda, H. Miyamoto, T. Inagaki, K. Cho and T. Nagase
    • Organizer
      TMS2018 annual meeting
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 非等量配合ハイエントロピー合金の微細組織2017

    • Author(s)
      藤岡由美、趙研、永瀬丈嗣、安田弘行
    • Organizer
      日本金属学会2017年秋期大会
    • Related Report
      2017 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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