Analysis of the Thermal Activation of High-Mobility Dislocation Loops

• Ohsawa Kazuhito

  Research Institute for Applied Mechanics, Kyushu University

• Kuramoto Eiichi

  Research Institute for Applied Mechanics, Kyushu University

抄録

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 L_c. 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 L_c is a plausible criterion for the dislocation loops to distinguish dislocation like from point-defect like in size.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 46 (3), 457-462, 2005

  公益社団法人 日本金属学会

キーワード

• dislocation
• self-interstitial atom
• thermal activation
• rate theory
• crowdion
• bifurcation

詳細情報

• CRID: 1390282679227812608
• NII論文ID: 10015578631
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.46.457
• COI: 1:CAS:528:DC%2BD2MXjvFSrtbo%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 7289772
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7289772
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/46/3/46_3_457/_pdf
• 本文言語コード: en
• データソース種別:
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