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Quantification of nanoscale structure formed by radiation-induced segregation

Research Project

Project/Area Number 19K22153
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 31:Nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionThe University of Tokyo (2021)
Nagaoka University of Technology (2019-2020)

Principal Investigator

Murakami Kenta  東京大学, 大学院工学系研究科(工学部), 准教授 (50635000)

Co-Investigator(Kenkyū-buntansha) 寺内 誠  国立研究開発法人日本原子力研究開発機構, 高速炉・新型炉研究開発部門 敦賀総合研究開発センター, リーダー (40838992)
CHEN DONGYUE  東京大学, 大学院工学系研究科(工学部), 特任准教授 (10816028)
岩田 憲幸  久留米工業高等専門学校, 材料システム工学科, 教授 (40397534)
関村 直人  東京大学, 大学院工学系研究科(工学部), 教授 (10183055)
Project Period (FY) 2019-06-28 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywords原子力材料 / 照射欠陥 / アトムプローブ / 照射損傷 / イオンビーム / 原子力工学 / 格子欠陥 / 原子力材料・核燃料
Outline of Research at the Start

3DAPでは、針状の試料に高周波パルス電圧を加えることで試料表面の原子を一つずつ電界蒸発させて、二次元+時間の三次元情報とTime of Flight法による原子の質量数から、三次元の原子マップを再構成する手法である。
原理上、試料の方位によって分解能の意味合いが違っているので、あらかじめ結晶方位を特定してからFIBで試料作製し、どの原子面から飛び出した原子かを分類する。さらに試料の方向に合わせて、探索したいナノ組織の形状に合わせて、異方性を考慮した探索アルゴリズムを構築する。これらを組み合わせることにより、異方性を持ったナノ組織に適した分析手法を確立する。

Outline of Final Research Achievements

We developed a new procedure for evaluating the degradation of structural materials used in nuclear reactors. Three-dimensional atom probe tomography (APT) is an analytical technique that can measure the spatial distribution of elements on a nanometer scale, but in addition to the elemental distribution, crystal orientation is important when analyzing structural materials. By taking samples from a specific direction, we have shown that even when using APT alone, the crystal orientation of a sample can be identified and the anisotropy of elemental segregation can be analyzed in steels. We also succeeded in observing the aggregation of multiple elements through dislocation loops in the reactor pressure vessel model material.

Academic Significance and Societal Importance of the Research Achievements

APTの誤差の原因となる元素や方位による蒸発率の違いと再構成の最適化に迫ることを目指して研究に着手しましたが、結果的に原子炉構造材料の転位ループへの偏析を分析するのに適したプラクティカルな測定手順を考案できました。
高額装置を使った顕微鏡技術は年々ブラックボックス化しています。今回のプロジェクトは装置開発や共同利用管理に加わっていない一般ユーザの立場から分析手法を見直して、装置の改造等を経ずに希望する分析手法を見出したという点に社会的な意義があります。
研究には国内外の複数の大学・研究機関からの社会人博士学生等も参画し、質の高いユーザとなるための研鑽を積むこともできました。

Report

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

    (27 results)

All 2022 2021 2020 2019

All Journal Article (10 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results) Presentation (17 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] Flux effects on point defect behavior by tracking loop evolution using combined irradiation method2022

    • Author(s)
      Chen Dongyue、Murakami Kenta、Yang Huilong、Chen Liang、Abe Hiroaki、Li Zhengcao、Sekimura Naoto
    • Journal Title

      Scripta Materialia

      Volume: 207 Pages: 114311-114311

    • DOI

      10.1016/j.scriptamat.2021.114311

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Effect of solute elements (Ni, Mn) in Fe-based alloys on dislocation loop evolution under Fe2+ ion irradiation2022

    • Author(s)
      Prak Tom Phongsakorn、Murakami Kenta、Luu Vu Nhut、Nguyen Ba Vu Chinh、Chen Liang
    • Journal Title

      Journal of Nuclear Materials

      Volume: 559 Pages: 153489-153489

    • DOI

      10.1016/j.jnucmat.2021.153489

    • Related Report
      2021 Annual Research Report
  • [Journal Article] In situ transmission electron microscopy study of growth of dislocation loops in Fe-Ni alloy under ion irradiation2020

    • Author(s)
      Chen Liang、Murakami Kenta、Chen Dongyue、Abe Hiroaki、Li Zhengcao、Sekimura Naoto
    • Journal Title

      Scripta Materialia

      Volume: 187 Pages: 453-457

    • DOI

      10.1016/j.scriptamat.2020.06.071

    • Related Report
      2020 Research-status Report
  • [Journal Article] An investigation of nucleation sites for the formation of solute clusters in ferrite Fe2020

    • Author(s)
      Chen Dongyue、Murakami Kenta、Chen Liang、Li Zhengcao、Sekimura Naoto
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

      Volume: 478 Pages: 182-186

    • DOI

      10.1016/j.nimb.2020.06.037

    • Related Report
      2020 Research-status Report
  • [Journal Article] Ion irradiation-induced the radiation hardening in Fe and Fe-0.3Si alloys2020

    • Author(s)
      Tom Phongsakorn Prak、Murakami Kenta、Nhut Luu Vu
    • Journal Title

      IOP Conference Series: Materials Science and Engineering

      Volume: 785 Issue: 1 Pages: 012027-012027

    • DOI

      10.1088/1757-899x/785/1/012027

    • Related Report
      2020 Research-status Report 2019 Research-status Report
  • [Journal Article] The mechanistic implications of the high temperature, long time thermal stability of nanoscale Mn-Ni-Si precipitates in irradiated reactor pressure vessel steels2020

    • Author(s)
      Almirall N.、Wells P.B.、Pal S.、Edmondson P.D.、Yamamoto T.、Murakami K.、Odette G.R.
    • Journal Title

      Scripta Materialia

      Volume: 181 Pages: 134-139

    • DOI

      10.1016/j.scriptamat.2020.02.027

    • Related Report
      2020 Research-status Report 2019 Research-status Report
  • [Journal Article] The effects of loop size on the unfaulting of Frank loops in heavy ion irradiation2020

    • Author(s)
      Chen Dongyue、Murakami Kenta、Dohi Kenji、Nishida Kenji、Li Zhengcao、Sekimura Naoto
    • Journal Title

      Journal of Nuclear Materials

      Volume: 529 Pages: 151942-151942

    • DOI

      10.1016/j.jnucmat.2019.151942

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Investigation of anisotropic hardening response in a 12Cr-ODS ferritic steel subjected to 2.8?MeV Fe2+ irradiation2020

    • Author(s)
      Yang H.L.、Kano S.、Shen J.J.、McGrady J.、Li Y.F.、Chen D.Y.、Murakami K.、Abe H.
    • Journal Title

      Journal of Nuclear Materials

      Volume: 531 Pages: 152016-152016

    • DOI

      10.1016/j.jnucmat.2020.152016

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Swelling of alpha-quartz induced by MeV ions irradiation:Critical dose and swelling mechanism2020

    • Author(s)
      Vu Nhut Luu、Murakami Kenta、Samouh Hamza、Maruyama Ippei、Suzuki Kiyoteru、Tom Phognsakorn Prak、Chen Liang、Kano Sho、Yang Huilong、Abe Hiroaki、Suzuki Masahide
    • Journal Title

      Journal of Nuclear Materials

      Volume: - Pages: 152266-152266

    • DOI

      10.1016/j.jnucmat.2020.152266

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] A model to evaluate the hardening effect of solute clusters in Fe-based alloys2019

    • Author(s)
      Chen Liang、Nishida Kenji、Murakami Kenta、Chen Dongyue、Liu Li、Kobayashi Tomohiro、Li Zhengcao、Sekimura Naoto
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

      Volume: 455 Pages: 32-34

    • DOI

      10.1016/j.nimb.2019.06.022

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] より高いMn-Ni-Si濃度のRPVモデル合金の硬度と微細構造に対するイオン照射効果2022

    • Author(s)
      Xinrun Chen
    • Organizer
      日本原子力学会2022年春の年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 低温イオン照射による鉄基合金の照射損傷モデルの検証2022

    • Author(s)
      村上健太
    • Organizer
      日本原子力学会2022年春の年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Stability and growth of radiation defects influenced by cascade damage at different fluxes2022

    • Author(s)
      Dongyue Chen
    • Organizer
      日本原子力学会2022年春の年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Atom probe tomography analysis of anisotropic distribution of solute elements (Mn, Ni)on irradiated Fe - based model alloy2021

    • Author(s)
      Ba Vu Chinh Nguyen
    • Organizer
      日本原子力学会2021年秋の大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Recent progress of APT analysis of RPV surveillance materials in the University of Tokyo2021

    • Author(s)
      Kenta Murakami
    • Organizer
      IGRDM-update (International Group on Radiation Damage Mechanisms)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Analyzing Flux Effects on the Evolution of Dislocation Loops Using Combined Irradiation Method2021

    • Author(s)
      Dongyue Chen, Kenta Murakami, Huilong Yang, Liang Chen, Hiroaki Abe, Naoto Sekimura
    • Organizer
      日本金属学会2021年春期講演大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Effects of solute elements in iron-based alloys for hardness change along helium irradiation and post-irradiation annealing2020

    • Author(s)
      Phongsakorn Prak Tom, Kenta Murakami, Vu Nhut Luu, Liang Chen
    • Organizer
      日本原子力学会2020年秋の大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Nature of defect clusters produced in ferritic model alloy at elevated temperatures2020

    • Author(s)
      Liang Chen, Kenta Murakami, Dongyue Chen, Huilong Yang, Hiroaki Abe, Zhengcao Li, Naoto Sekimura
    • Organizer
      日本原子力学会2020年秋の大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 鉄基合金におけるカスケード損傷の可視化と定量化2020

    • Author(s)
      村上健太
    • Organizer
      日本原子力学会2020年春の年会
    • Related Report
      2019 Research-status Report
  • [Presentation] 照射劣化の中性子束効果に関する考察2020

    • Author(s)
      村上健太
    • Organizer
      令和元年度材料照射研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] Swelling behavior of SiO2 mineral under ion irradiation2020

    • Author(s)
      Luu Vu Nhut
    • Organizer
      令和元年度材料照射研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] Ion irradiation induced the radiation hardening in Fe and Fe-0.3Si alloys2019

    • Author(s)
      Phongsakorn Prak Tom
    • Organizer
      International Nuclear Science Technology and Engineering Conference 2019 (iNuSTEC2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] コンクリート骨材の寸法変化に対するイオン照射効果2019

    • Author(s)
      村上健太
    • Organizer
      日本原子力学会2019年秋の大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 劣化メカニズムに基づく中性子束効果の検討2019

    • Author(s)
      村上健太
    • Organizer
      日本保全学会第16回学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] Swelling of alpha-quartz induced by MeV ions irradiation:Critical dose and swelling mechanism2019

    • Author(s)
      Luu Vu Nhut
    • Organizer
      Vietnam Conference on Nuclear Science and Technology (VINANST) 13
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Probabilistic assessment of structural integrity of reactor pressure vessel in severe loading conditions caused by various transients2019

    • Author(s)
      Nguyen Ba Vu Chinh
    • Organizer
      Vietnam Conference on Nuclear Science and Technology (VINANST) 13
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Advanced Nuclear Reactor Maintenance Activities Grading Using Modified Fuzzy FMEA & Expert Judgement Methodology2019

    • Author(s)
      I Wayan Ngarayana
    • Organizer
      The 19th International Conference on Emerging Nuclear Energy Systems [ICENES 2019]
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-07-04   Modified: 2023-01-30  

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