Analysis of the thermal activation of high-mobility dislocation loops

Kazuhito Ohsawa, Eiichi Kuramoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We report thermally activated transport of highly mobile dislocation loops in terms of a line tension model where the dislocation loops are assumed to be a flexible string. The activation energy and transition rate are calculated on the basis of a classical rate theory. The activation energy merely increases with the length of the dislocation loops. However, the activation process and temperature dependence of the transition rate qualitatively change at a critical length Lc. If the dislocation loops are longer than the critical length, the thermal activation occurs through the conventional double-kink formation process on the dislocation lines. On the other hand, if the dislocation loops are shorter than that, the saddle point configuration is not the double-kink type but non-deformation one. Therefore, the critical length Lc is a plausible criterion for the dislocation loops to distinguish dislocation like from point-defect like in size.

Original languageEnglish
Pages (from-to)457-462
Number of pages6
JournalMaterials Transactions
Issue number3
Publication statusPublished - Mar 2005

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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