One-Dimensional Glide Motion of “Naked” Nanoscale 1/2<111> Prismatic Dislocation Loops in Iron

DOI Web Site 2 Citations 23 References
  • Arakawa Kazuto
    Department of Materials Science, Faculty of Science and Engineering, Shimane University CREST, JST
  • Amino Takafumi
    Advanced Technology Research Laboratories, Nippon Steel & Sumitomo Metal Corporation
  • Isshiki Minoru
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Mimura Kouji
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Uchikoshi Masahito
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Mori Hirotaro
    Research Center for Ultra-High Voltage Electron Microscopy, Osaka University

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Other Title
  • One-Dimensional Glide Motion of “Naked” Nanoscale 1/2^|^lt;111^|^gt; Prismatic Dislocation Loops in Iron

Abstract

One-dimensional (1D) glide diffusion of interstitial-type prismatic dislocation loops is believed to play key roles in microstructural evolutions within nuclear-fusion and fission materials upon energetic particle irradiation. In the present study, using in-situ transmission electron microscopy, we have examined behaviors of nanoscale 1/2<111> loops in high-purity α-iron at “low temperatures” ranging from 15 to 290 K, under zero external stress. We observed 1D intermittent and fast motion of loops above approximately 100 K, which was significantly different from the 1D continuous and viscous motion observed at “high temperatures” above approximately 450 K. The estimated lower-limit values of diffusivities for “low temperatures” were considerably higher than the values obtained through the extrapolation of the temperature dependence of the diffusivities at “high temperatures.” These results support the idea that strong obstacles for loop motion are formed by heating of the specimens to “high temperatures” after the introduction of loops.

Journal

  • ISIJ International

    ISIJ International 54 (10), 2421-2424, 2014

    The Iron and Steel Institute of Japan

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