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Redefinition of states of short-range order (SRO) in alloys

Research Project

Project/Area Number 18K18954
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 26:Materials engineering and related fields
Research InstitutionKyushu University

Principal Investigator

Hata Satoshi  九州大学, 総合理工学研究院, 教授 (60264107)

Project Period (FY) 2018-06-29 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords短範囲規則 / 電子顕微鏡 / 逆位相境界 / 合金 / 規則ー不規則変態 / 三次元 / 準周期構造 / 副単位胞 / Ni-Mo合金 / 高分解能電子顕微鏡 / 三次元構造 / 単位胞 / 長範囲規則 / 投影構造 / 濃度ゆらぎ / アトムプローブ / Ni-Mo-Cr合金 / 短範囲規則状態 / 規則-不規則変態 / 逆位相ドメイン境界 / 構造揺らぎ
Outline of Final Research Achievements

Local atomic arrangements of short-range order (SRO) in Ni4Mo alloy were investigated by aberration-corrected annular-dark-field scanning transmission electron microscopy. The SRO structure is a three-dimensional domain structure that consists of the two structural parts: (i) a common structural unit among several long-range ordered (LRO) structures of stable Ni4Mo or metastable Ni3Mo and Ni2Mo phases and (ii) an aperiodic and anisotropic arrangement of sub-unit-cells of these phases. In the course of SRO-LRO transition, the structural part (i) grows continuously, while the structural part (ii) stops its growth and, instead, preferential growth of the stable Ni4Mo sub-unit-cells into its LRO domains. Finally, a new definition of SRO based on anti-phase domain boundary energy was proposed.

Academic Significance and Societal Importance of the Research Achievements

短範囲規則(SRO)構造は、合金をはじめとする種々の結晶化合物で観察され、特にハイエントロピー合金や鉄鋼材料などでは力学特性に顕著な影響を及ぼす構造因子として今も研究がなされている。従来の規則ドメインサイズや原子相関距離に基づくSROの定義に比べると、本研究から導いた逆位相境界(APB)エネルギーに基づくSROの定義は、局所的な原子配列やAPB、すなわち結晶欠陥あるいは部分規則状態の構造的特徴を示すものである。この定義は、例えば、転位とSROの相互作用や逆位相ドメイン組織の生成過程など、材料物性や組織制御との関係を考える上で有効なSROの知見になるものと考えられる。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (16 results)

All 2020 2019 2018 Other

All Int'l Joint Research (5 results) Journal Article (4 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (6 results) (of which Int'l Joint Research: 3 results,  Invited: 5 results) Remarks (1 results)

  • [Int'l Joint Research] Bhabha Atomic Research Centre(インド)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Virginia Tech(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Monash University(オーストラリア)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Bhabha Atomic Research Centre/Materials Science Division(インド)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Bhabha Atomic Research Centre(インド)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Electron tomography: An imaging method for materials deformation dynamics2020

    • Author(s)
      S. Hata, T. Honda, H. Saito, M. Mitsuhara, M. Murayama
    • Journal Title

      Current Opinion in Solid State & Materials Science

      Volume: 24 Issue: 4 Pages: 100850-100850

    • DOI

      10.1016/j.cossms.2020.100850

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Electron tomography imaging methods with diffraction contrast for materials research2020

    • Author(s)
      S. Hata, H. Furukawa, T. Gondo, D. Hirakami, N. Horii, K. Ikeda, K. Kawamoto, K. Kimura, S. Matsumura, M. Mitsuhara, H. Miyazaki, S. Miyazaki, M. Murayama, H. Nakashima, H. Saito, M. Sakamoto, S. Yamasaki
    • Journal Title

      Microscopy

      Volume: In press Issue: 3 Pages: 141-155

    • DOI

      10.1093/jmicro/dfaa002

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Development of An <i>In-Situ</i> Straining and Tomography System in TEM2019

    • Author(s)
      波多 聰、宮崎 裕也、斉藤 光、村山 光宏、佐藤 和久、工藤 博幸、古河 弘光、川本 克巳、堀井 則孝、加茂 勝己、宮崎 伸介、權堂 貴志
    • Journal Title

      KENBIKYO

      Volume: 54 Issue: 1 Pages: 44-48

    • DOI

      10.11410/kenbikyo.54.1_44

    • NAID

      130007655723

    • ISSN
      1349-0958, 2434-2386
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Placticals and Trends of Electron Tomography for Materials Research2018

    • Author(s)
      Hata Satoshi、Saito Hikaru、Murayama Mitsuhiro、Sato Kazuhisa、Kudo Hiroyuki
    • Journal Title

      Materia Japan

      Volume: 57 Issue: 12 Pages: 589-594

    • DOI

      10.2320/materia.57.589

    • NAID

      130007538985

    • ISSN
      1340-2625, 1884-5843
    • Year and Date
      2018-12-01
    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] イジング・モンテカルロ計算機実験による規則合金の原子レベルドメイン構造の再検討2020

    • Author(s)
      波多聰、田中友晶、斉藤光、中野貴由
    • Organizer
      日本金属学会第166回講演大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Add new function on electron tomography: magnetic-field-free diffraction contrast imaging and in-situ specimen straining2019

    • Author(s)
      S. Hata
    • Organizer
      The Fourth Joint Symposium of Kyushu University and Yonsei University on Materials Science and Mechanical Engineering
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Development of electron tomography observation methods for deformed materials: from static to dynamic 3D imaging2018

    • Author(s)
      S. Hata
    • Organizer
      12th Japanese-Polish Joint Seminar on Micro and Nano Analysis
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Development of an in-situ tomography system for deformation phenomena2018

    • Author(s)
      S. Hata
    • Organizer
      International Symposium on Microscopy & Microanalysis of Materials
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 材料変形の電子線トモグラフィー観察手法の開発2018

    • Author(s)
      波多聰
    • Organizer
      金属第58回 鉄鋼鯛61回 中国四国支部講演大会 日本鉄鋼協会中四国支部湯川記念講演
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] その場変形電子線トモグラフィー:転位ダイナミクスの三次元イメージングを目指して2018

    • Author(s)
      波多聰
    • Organizer
      第61回日本顕微鏡学会シンポジウム
    • Related Report
      2018 Research-status Report
    • Invited
  • [Remarks]

    • URL

      http://www.asem.kyushu-u.ac.jp/qq/qq01/top-j.html

    • Related Report
      2018 Research-status Report

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Published: 2018-07-25   Modified: 2022-01-27  

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