Thermally activated transport of a dislocation loop within an elastic model

Kazuhito Ohsawa, Eiichi Kuramoto

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report thermally activated transport of a dislocation loop in terms of a line tension model, where the dislocation line is assumed to be a flexible string. According to conventional rate theory, the features of thermal activation are determined by the saddle-point geometry in high dimensional configuration space. If the circumference of a dislocation loop L is longer than a critical length Lc, the selected saddle-point configuration is the well known double-kink type solution. On the other hand, the manner of the thermal activation of a dislocation loop shorter than Lc is rather point-defect-like. In the present work, we pay attention to the temperature dependence of transition rate which is represented such as ν0* exp (- E / kB T). The pre-exponential factor depends on temperature like ν0* ∼ T- 1 / 2 for sufficiently long dislocation loops on the basis of the analysis.

Original languageEnglish
Pages (from-to)327-331
Number of pages5
JournalJournal of Nuclear Materials
Volume367-370 A
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - Aug 1 2007

Fingerprint

Chemical activation
Point defects
Dislocations (crystals)
saddle points
Temperature
Geometry
activation
circumferences
configurations
point defects
strings
Hot Temperature
temperature dependence
geometry
temperature

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

Cite this

Thermally activated transport of a dislocation loop within an elastic model. / Ohsawa, Kazuhito; Kuramoto, Eiichi.

In: Journal of Nuclear Materials, Vol. 367-370 A, No. SPEC. ISS., 01.08.2007, p. 327-331.

Research output: Contribution to journalArticle

Ohsawa, Kazuhito ; Kuramoto, Eiichi. / Thermally activated transport of a dislocation loop within an elastic model. In: Journal of Nuclear Materials. 2007 ; Vol. 367-370 A, No. SPEC. ISS. pp. 327-331.
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