A comment on the role of Frank-Read sources in plasticity of nanomaterials

被引：42
作者：
Estrin, Y.
Kim, H. S. [1 ]
Nabarro, F. R. N.
机构：
[1] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia
[2] CSIRO, Div Mat Manufact Technol, Clayton, Vic 3169, Australia
[3] Chungnam Natl Univ, Dept Nano Mat Engn, Taejon 305764, South Korea
[4] Univ Witwatersrand, Sch Phys, Johannesburg, South Africa
来源：
ACTA MATERIALIA | 2007年 / 55卷 / 19期
关键词：
nanocrystalline materials; dislocations; plastic deformation; copper; strain rate sensitivity;
D O I：
10.1016/j.actamat.2007.07.052
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Dislocation generation by a Frank-Read source was considered for the case of nanocrystalline metallic materials. It was shown that thermally activated operation of this mechanism, which was proposed in the literature as an explanation for the observed grain size dependence of the strain rate sensitivity (SRS) of the flow stress, is only possible in a very limited range of the source lengths and stresses. By comparing the calculated SRS with the experimental data for copper, it was further demonstrated that the thermally activated Frank-Read mechanism can be discarded as a process underlying the observed strain rate sensitivity data. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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收藏
页码：6401 / 6407
页数：7
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