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Elucidation of mechanism of segregation of solute atom to dislocations

Research Project

Project/Area Number 21K04623
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 InstitutionTohoku University

Principal Investigator

Inoue Koji  東北大学, 金属材料研究所, 准教授 (50344718)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsアトムプローブ / 3次元アトムプローブ / 偏析 / 格子欠陥 / コットレル雰囲気 / 溶質原子の偏析 / コットレル効果
Outline of Research at the Start

本研究では、透過型電子顕微鏡観察と3次元アトムプローブ分析を同一の転位に対して行い、透過型電子顕微鏡で転位構造を決定し、透過型電子顕微鏡で観察した転位における溶質原子の3次元元素分布を3次元アトムプローブで得る。そして、転位構造と溶質原子の分布の対応を見ることで、転位-溶質原子相互作用(コットレル雰囲気)の詳細を明らかにする。

Outline of Final Research Achievements

Three-dimensional distribution of solute atoms in edge and screw dislocations was observed by atom probe tomography. A new sample preparation method was developed to efficiently observe the segregation of solute atoms to dislocations. The measurement samples were fabricated using a focused ion beam (FIB) apparatus, but it is difficult to observe dislocations using the scanning electron microscope equipped with the FIB. Therefore, a needle sample was prepared using the FIB and then observed by transmission electron microscope to confirm the position of the dislocations in the needle sample, and additional FIB processing was performed again. A sample containing dislocations at the needle tip was prepared, and the three-dimensional elemental distribution of solute atoms at the dislocation was obtained. Since this method can be applied not only to dislocations but also to various kinds of crystal lattice defects, the segregation around voids was also clarified.

Academic Significance and Societal Importance of the Research Achievements

構造材料でもっとも重要な鉄鋼材料において、Cの分布は機械的特性に大きな影響を与えるため、その詳細を理解することは、今後の材料開発にとって重要である。Cは軽元素であるため従来の手法では検出しにくく、今回、原子1個1個を3次元実空間で見ることのできる3次元アトムプローブを用い、さらに試料作製方法を工夫することで、転位などの特定部位のCの分布について明らかにした。今回開発した手法は転位に限らず、さまざまな格子欠陥に適用できる。さらに、鉄鋼材料以外の材料への適用も可能である。そのため、一例としてタングステン中のボイド周囲の核変換元素の偏析についても適応し、この手法の有効性を示した。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (7 results)

All 2023 2022 2021

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Direct observation of voids decorated with transmuted rhenium atoms in neutron-irradiated tungsten by correlative use of TEM and APT2023

    • Author(s)
      Koji Inoue, Taiki Yamashita, Shuhei Nogami, Akira Hasegawa, Takeshi Toyama, Yasuyoshi Nagai
    • Journal Title

      Materialia

      Volume: 32 Pages: 101963-101963

    • DOI

      10.1016/j.mtla.2023.101963

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Investigation of Nanoscale Phase Formation in Rapidly Solidified Fe<sub>20</sub>Co<sub>20</sub>Ni<sub>20</sub>Cr<sub>20</sub>B<sub>20−</sub><i><sub>x</sub></i>Si<i><sub>x</sub></i> Alloys2022

    • Author(s)
      Yicheng ZHANG, Koji INOUE, Tatsuya TOKUNAGA, Manabu ISHIMARU, Hidenori ERA
    • Journal Title

      MATERIALS TRANSACTIONS

      Volume: 63 Issue: 9 Pages: 1211-1216

    • DOI

      10.2320/matertrans.MT-M2022058

    • ISSN
      1345-9678, 1347-5320
    • Year and Date
      2022-09-01
    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Presentation] 高速実験炉「常陽」で中性子照射された純タングステンにおける核変換レニウムでデコレートされたボイドの直接観察2023

    • Author(s)
      井上耕治、山下大輝、長谷川晃、外山健、永井康介
    • Organizer
      日本金属学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Evolution of Mn-Ni-Si clusters in a low copper reactor pressure vessel steel analyzed by atom probe tomography2023

    • Author(s)
      K. Inoue, C. Zhao, R. Shibahara, K. Kurano, Y. Kume, Y. Shimada, Y. Du, K. Yoshida, T. Toyama, M. J. Konstantinovic, R. Gerard, Y. Nagai
    • Organizer
      Summit of Materials Science 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] CrCoNi等原子量ミディアムエントロピー合金における双晶界面や積層欠陥への溶質原子の偏析について2023

    • Author(s)
      井上耕治
    • Organizer
      日本金属学会
    • Related Report
      2022 Research-status Report
  • [Presentation] ハイエントロピー合金におけるアトムプローブ分析2022

    • Author(s)
      井上耕治
    • Organizer
      大洗研究会
    • Related Report
      2022 Research-status Report
  • [Presentation] 透過電子顕微鏡(TEM,STEM)と3次元アトムプローブ(APT)観察を同一箇所に用いた材料分析2021

    • Author(s)
      井上耕治
    • Organizer
      大洗アルファ合同研究会
    • Related Report
      2021 Research-status Report
    • Invited

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Published: 2021-04-28   Modified: 2025-01-30  

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