Formation and Growth Process of Dislocation Loops in Zircaloys under Electron Irradiation

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<BR>We have investigated the formation and growth process of dislocation loops in Zircaloys (Zrys) under electron irradiation using a high voltage electron microscope (HVEM). Dislocation loops are of great importance to degradation phenomena in fuel claddings, such as irradiation growth and reduced ductility in light water reactors. TEM specimens of three kinds of Zircaloys (Zry-2, Zry-4 and improved Zry-2) were irradiated with 1MeV electrons at temperatures from 320K to 970K in the HVEM. Interstitial-type dislocation loops with the Burgers vector b=1/3(1120) were formed on the pyramidal or the prismatic planes at the beginning of irradiation. It was found that the nucleation and growth process of those loops follows the kinetics based on the di-interstitial model where di-interstitials act as the nuclei of interstitial dislocation loops. Based on this model, migration energies of interstitials and vacancies were determined to be 0.15-0.22eV and 1.0-1.2eV, respectively, from the irradiation temperature dependence of the density and the growth rate of loops.

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  • Journal of nuclear science and technology

    Journal of nuclear science and technology 34(11), 1079-1086, 1997-11-25

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002078422
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • NDL 記事登録ID
    4346185
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A460
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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