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Experimental and theoretical approach for mobile defect clusters introduced under heavy ion irradiations

Research Project

Project/Area Number 16560732
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear engineering
Research InstitutionThe University of Tokyo

Principal Investigator

ABE Hiroaki  The University of Tokyo, School of Engineering, Associate Professor, 大学院・工学系研究科, 助教授 (40343925)

Co-Investigator(Kenkyū-buntansha) SEKIMURA Naoto  The University of Tokyo, School of Engineering, Professor, 大学院・工学系研究科, 教授 (10183055)
IWAI Takeo  The University of Tokyo, School of Engineering, Research Associate, 大学院・工学系研究科, 助手 (30272529)
LI Zhengcao  The University of Tokyo, School of Engineering, Research Associate, 大学院・工学系研究科, 助手 (30376496)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2005: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2004: ¥2,200,000 (Direct Cost: ¥2,200,000)
Keywordselectron microscopy / ion accelerator / displacement cascade / molecular dynamics / coherent precipitate / crowdion / copper / copper-cobalt alloy / 金
Research Abstract

It is well known that ion beams interact with materials introducing microstructural change of material properties due to accumulation of point defects and displacement cascades. This has been attracting attentions from both points of view of its basic understandings and applications, however, the process of the interaction and the behaviors of defects induced by ion irradiation have not yet been fully understood. Recent molecular dynamic calculations successfully detected mobile defect clusters in metals. The motion suggests that dislocation loops transform into mobile clusters enabling diffusion with relatively low activation energy. However, its mechanism has not been clarified yet experimentally. In this work, TEM observations and molecular dynamic calculations were performed so as to accumulate experimental evidences of the mobile clusters for its identifications as follows.
(1) in-situ TEM observations of the mobile defect clusters with a TEM interfaced with an ion accelerator : In … More -situ TEM observations in copper and gold under irradiations with 100-keV C^+, 240-keV Cu^+, 600-keV Kr^<2+> and 900-keV Xe^<3+> ions at temperatures from 573K to 823K were performed to get direct experimental insights into the defect accumulation processes. Defect clusters corresponding to displacement cascades were observed to be unstable depending on temperature, ion species and fluence. High mobility of instable defect clusters were also detected. The directions both of cascade-driven and instability-driven diffusion were strongly related to crowdion directions, suggesting that the mechanism is based on motion of crowdion-related glissile defects.
(2) Detection of point defects in Cu-1%Co under ion irradiation by means of precipitate coherency : Transmission electron microscopy has been widely used to investigate the radiation-damage microstructures, but has limitations when observing point defects due to its resolution limit. In the present study, a dilute Cu-Co alloy, which is a typical precipitation-hardened alloy, has been selected to investigate the formation and the mobility of point defects upon ion irradiation, during which the coherent precipitates lose their coherency and exhibit incoherent strain contrast, and the coherency loss can be used to detect the point defects.
(3) Molecular dynamic simulations on the stability of crowdion bundles in copper : The cluster was first input in a pure copper and the thermal stability has achieved at OK. The cluster transformed into sessile clusters. By annealing at temperatures up to 100K, the crowdions were generated so as to change its habit plane from {111} to another. Less

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (17 results)

All 2006 2005 2004 Other

All Journal Article (16 results) Book (1 results)

  • [Journal Article] Analysis of Defects Formation and Mobility during Ion Irradiation by Coherent Precipitates2006

    • Author(s)
      Z.C.Li, H.Abe, N.Sekimura
    • Journal Title

      Materials Transactions 47

      Pages: 1-4

    • NAID

      10017282810

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Detection of point defects upon ion irradiation by means of precipitates coherency2006

    • Author(s)
      Z.C.Li, H.Abe, N.Sekimura
    • Journal Title

      Journal of Nuclear Materials (accepted)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Detection of point defects upon ion irradiation by means of precipitates coherency2006

    • Author(s)
      Z.C.Li, H.Abe, N.Sekimura
    • Journal Title

      Materials Transactions

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Stability and Mobility of Interstitial-Type Defect Clusters Generated from Displacement Cascades in Copper and Gold by In-Situ Transmission Electron Microscopy2005

    • Author(s)
      Hiroaki Abe, Naoto Sekimura, Tadayasu Tadokoro
    • Journal Title

      Materials Transactions 46・03

      Pages: 433-439

    • NAID

      10015578550

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effects of Ion Irradiation on Coherency of Precipitates in Cu- Co Alloy2005

    • Author(s)
      Z.C.Li, H.Abe, M.Ishikawa, N.Sekimura
    • Journal Title

      Materials Transactions 46

      Pages: 1783-1785

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Thermodynamic and atomistic modeling of irradiation-induced amorphization in nonosized metal-metal multilayers2005

    • Author(s)
      B.X.Liu, Z.C.Li, H.R.Gong
    • Journal Title

      Surface & Coatings Technology 196

      Pages: 2-9

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Stability and Mobility of Interstitial-Type Defect Clusters Generated from Displacement Cascades in Copper and Gold by In-Situ Transmission Electron Microscopy2005

    • Author(s)
      H.Abe, N.Sekimura, T.Tadokoro
    • Journal Title

      Materials Transactions 46

      Pages: 433-439

    • NAID

      10015578550

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effects of Ion Irradiation on Coherency of Precipitates in Cu-Co Alloy2005

    • Author(s)
      Z.C.Li, H.Abe, M.Ishikawa, N.Sekimura
    • Journal Title

      Materials Transactions 46

      Pages: 1783-1785

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Thermodynamic and atomistic modeling of irradiation-induced amorphization in nanosized metal-metal multilayers2005

    • Author(s)
      B.X.Liu, Z.C.Li, H.R.Gong
    • Journal Title

      Surface & Coatings Technology 196

      Pages: 2-9

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Thermodynamic and atomistic modeling of irradiation-induced amorphization in nanosized metal- metal multilayers2005

    • Author(s)
      B.X.Liu, Z.C.Li, H.R.Gong
    • Journal Title

      Surface & Coatings Technology 196

      Pages: 2-2

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Stability and Mobility of Interstitial-Type Defect. Clusters Generated from Displacement Cascades in Copper and Gold by In-Situ Transmission Electron Microscopy2005

    • Author(s)
      Hiroaki Abe, Naoto Sekimura, Tadayasu Tadokoro
    • Journal Title

      Materials Transactions 46巻03号

      Pages: 433-439

    • NAID

      10015578550

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Elementary processes in channeling deformation in FCC copper : a molecular dynamics study2004

    • Author(s)
      Y.Yang, N.Sekimura, H.Abe
    • Journal Title

      Journal of Nuclear Materials 329・333

      Pages: 1208-1213

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Diffusion and conversion of interstitial dumbbells in segregated ternary alloys under irradiation2004

    • Author(s)
      O.Shepelyev, N.Sekimura, H.Abe
    • Journal Title

      Journal of Nuclear Materials 329・333

      Pages: 1204-1207

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Elementary processes in channeling deformation in FCC copper : a molecular dynamics study2004

    • Author(s)
      Y.Yang, N.Sekimura, H.Abe
    • Journal Title

      Journal of Nuclear Materials 329-333

      Pages: 1208-1213

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Diffusion and conversion of interstitial dumbbells in segregated ternary alloys under irradiation2004

    • Author(s)
      O.Shepelyev, N.Sekimura, H.Abe
    • Journal Title

      Journal of Nuclear Materials 329-333

      Pages: 1204-1207

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Detection of point defects upon ion irradiation by means of precipitates coherency

    • Author(s)
      Z.C.Li, H.Abe, N.Sekimura
    • Journal Title

      Journal of Nuclear Materials (accepted)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Book] 整合析出物を利用した高エネルギー粒子照射下欠陥生成・相互作用の研究2005

    • Author(s)
      石川雅也
    • Total Pages
      72
    • Publisher
      東京大学大学院工学系研究科 修士論文
    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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