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Evaluation of the calculation method of grain boundary segregation energy by diffusion rate theory model

Research Project

Project/Area Number 15K06429
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Physical properties of metals/Metal-base materials
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Ebihara Kenichi  国立研究開発法人日本原子力研究開発機構, システム計算科学センター, 研究主幹 (40360416)

Co-Investigator(Kenkyū-buntansha) 鈴土 知明  国立研究開発法人日本原子力研究開発機構, システム計算科学センター, 研究主幹 (60414538)
Research Collaborator Yamaguchi Masatake  
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords照射誘起粒界リン偏析 / 混合格子間原子対 / 空孔リン複合体 / 侵入型リン原子 / 第一原理計算 / 分子動力学法 / キネティックモンテカルロ法 / 拡散レートモデル / 粒界脆化 / 粒界偏析エネルギー / 粒界リン偏析 / キネティックモンテカルロ / 格子間リン原子 / 鉄リン格子間原子対
Outline of Final Research Achievements

Grain boundary(GB) segregation of embrittlement elements influences irradiation embrittlement of steel structural materials and the segregation depends on the GB segregation energy. Recently, it is reported that the simulated value of the segregation energy is different from that evaluated from experiments. In this study, from the hypothesis that this difference is due to the experimental evaluation ignoring the element distribution around GBs, we attempted to make a model for calculating phosphorus (P) distribution around GBs and GB segregation based on the atomic process. In making the model, we evaluated the diffusion coefficient of the mixed dumbbell of a P atom and an iron atom and made clear the GB P segregation process that is unknown previously. However, we found that it is additionally necessary to make clear the de-trapping process of P atoms from GBs.

Academic Significance and Societal Importance of the Research Achievements

リンの粒界偏析過程の考察において、粒界周辺の格子のひずみ及び熱による粒界自身のゆらぎが、リン原子の粒界への移動過程に大きく影響し、特に、粒界周辺において、単独で移動しにくい置換型原子に変わってしまうことが明らかになった。このような粒界周辺での不純物原子の移動への影響は従来あまり考えられていないものであることから、本研究での結果は、これまでの不純物の粒界偏析の考え方を修正するものであると考えられる。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (8 results)

All 2018 2017 2015

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Acknowledgement Compliant: 1 results) Presentation (6 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Atomistic simulation of phosphorus segregation to Σ3 (111) symmetrical tilt grain boundary in α-iron2018

    • Author(s)
      Ebihara Ken-ichi、Suzudo Tomoaki
    • Journal Title

      Modelling and Simulation in Materials Science and Engineering

      Volume: 26 Issue: 6 Pages: 065005-065005

    • DOI

      10.1088/1361-651x/aace6a

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Modeling of Phosphorus Transport by Interstitial Dumbbell in α−Iron Using First-Principles-Based Kinetic Monte Carlo2017

    • Author(s)
      Ken-ichi Ebihara, Tomoaki Suzudo, Masatake Yamaguchi
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 58 Issue: 1 Pages: 26-32

    • DOI

      10.2320/matertrans.ML201602

    • NAID

      130006776971

    • ISSN
      1345-9678, 1347-5320
    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Simulation of irradiation-induced grain boundary phosphorus segregation by first-principles-based rate theory model including trapping and detrapping processes2018

    • Author(s)
      Kenichi Ebihara, Tomoaki Suzudo, Masatake Yamaguchi
    • Organizer
      NUMAT2018: The Nuclear Materials Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Computational Study of Phosphorus Migration to Grain boundary in α-iron2018

    • Author(s)
      Kenichi Ebihara, Tomoaki Suzudo
    • Organizer
      The 9th International Conference on Multiscale Materials Modeling (MMM2018)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Simulation of Phosphorous Migration to Grain-boundary by Molecular Dynamics2018

    • Author(s)
      Ken-ichi Ebihara, Tomoaki Suzudo, Masatake Yamaguchi
    • Organizer
      TMS2018 147th Annual Meeting & Exhibition
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Numerical Estimation of Phosphorus Transport for Different Migration Modes in alpha-iron2017

    • Author(s)
      Ken-ichi Ebihara, Tomoaki Suzudo, Masatake Yamaguchi
    • Organizer
      TMS2017 146th Annual Meeting & Exhibition
    • Place of Presentation
      San Diego, California, USA
    • Year and Date
      2017-02-26
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 分子動力学シミュレーションによる粒界リン偏析過程の考察2017

    • Author(s)
      海老原健一、鈴土知明、山口正剛
    • Organizer
      日本金属学会2017年秋期(第161回)講演大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 第一原理計算に基づくキネティックモンテカルロによるα鉄中におけるリン拡散の考察2015

    • Author(s)
      海老原健一、鈴土知明、山口正剛
    • Organizer
      東北大学金属材料研究所ワークショップ
    • Place of Presentation
      秋保温泉旅館(宮城県仙台市)
    • Year and Date
      2015-11-16
    • Related Report
      2015 Research-status Report

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Published: 2015-04-16   Modified: 2020-03-30  

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