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Local Lattice Strain around Alloying Element and Martensitic Transformation in Titanium and Iron Alloys

Research Project

Project/Area Number 19K04991
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26010:Metallic material properties-related
Research InstitutionNagoya Industrial Science Research Institute

Principal Investigator

Morinaga Masahiko  公益財団法人名古屋産業科学研究所, 研究部, 研究員 (50126950)

Co-Investigator(Kenkyū-buntansha) 吉野 正人  名古屋大学, 工学研究科, 助教 (10397466)
湯川 宏  名古屋大学, 工学研究科, 助教 (50293676)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsチタン / 鉄 / マルテンサイト変態 / 局所格子歪 / 擬ポテンシャル / 合金設計 / 原子空孔 / 原子拡散 / 原子化エネルギー / 自己拡散係数 / 格子歪エネルギー
Outline of Research at the Start

金属中に原子サイズの違う合金元素が入ると、合金元素近傍の母金属格子に局所歪が導入される。この格子歪エネルギーの大きさは、熱エネルギーに匹敵する。従って、局所格子歪は、温度とともに変化する多くの合金の性質(例:強度、相安定性)に影響を及ぼす。それ故、局所格子歪の大きさを求めて、合金の性質との関係を調べることは重要である。
本研究では、チタン合金と鉄合金中の局所格子歪の大きさを、最新の計算方法を用いて初めて決定する。格子歪の成り立ちについて基本的な考え方を創出するとともに、両合金に現れるマルテンサイト変態の開始温度と局所格子歪の関係を調べ、合金設計の新しい指針を導出する。

Outline of Final Research Achievements

It is well known that local strains are introduced into the crystal lattice around a solute atom, M, due to the size mismatch between solute and solvent atoms in any alloy. In this study, local lattice strains are calculated for the first time in both binary Ti and Fe alloys,using the pseudopotential method.
The calculated local lattice strains are found to vary largely with M and the crystal structures. Also, there is a certain correlation between the martensite start temperature (Ms) and the local lattice strains introduced around M. Such local lattice strains work to suppress the onset of the martensitic transformation in both Ti and Fe alloys.

Academic Significance and Societal Importance of the Research Achievements

合金中の種々の合金元素近傍の局所格子歪の大きさを系統的に決定した最初の学術研究である。また、マルテンサイト変態は金属材料学の中核をなす変態であり、本研究成果は、実用上も重要な鉄合金やチタン合金の設計と開発を行う上で重要な知見を与える。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2020 2019

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] Local Lattice Strain around Alloying Element and Martensitic Transforamtion in Titanium Alloys2020

    • Author(s)
      M. Morinaga, H. Yukawa, M. Yoshino
    • Journal Title

      MATEC Web of Conferences

      Volume: 321 Pages: 11009-11009

    • DOI

      10.1051/matecconf/202032111009

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Local Lattice Strain around Alloying Element and Martensitic Transforamtion in Titanium Alloys2020

    • Author(s)
      M. Morinaga, H. Yukawa, M. Yoshino
    • Journal Title

      Proceedings of the 14th World Conference on Titanium, June 10-14, 2019, Nantes, France

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Invar Properties in Ti-Alloys Achieved through Alloy Design and Thermomechanical Treatments2019

    • Author(s)
      Mohamed Abdel-Hady Gepreel, M. Niinomi,M. Nakai, M. Morinaga
    • Journal Title

      JOM

      Volume: 7(10) Pages: 3631-3639

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] チタンおよび鉄中の原子空孔の近傍の局所格子歪2020

    • Author(s)
      森永正彦、湯川宏、吉野正人
    • Organizer
      日本金属学会春期講演大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Local Lattice Strain around Alloying Element and Martensitic Transforamtion in Titanium Alloys2019

    • Author(s)
      M. Morinaga, H. Yukawa, M. Yoshino
    • Organizer
      The 14th World Conference on Titanium, Nantes, France
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] A Quantum Approach to Alloy Design2019

    • Author(s)
      M. Morinaga
    • Organizer
      Egypt-Japan University of Science and Technology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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