Dislocation bow-out model for yield stress of ultra-fine grained materials

被引:48
|
作者
Kato, Masaharu [1 ]
Fujii, Toshiyuki [2 ]
Onaka, Susumu [1 ]
机构
[1] Tokyo Inst Technol, Dept Mat Sci & Engn, Interdisciplinary Grad Sch Sci & Engn, Yokohama, Kanagawa 2268502, Japan
[2] Tokyo Inst Technol, Interdisciplinary Grad Sch Sci & Engn, Dept Innovat & Engn Mat, Yokohama, Kanagawa 2268502, Japan
关键词
strength; ultra-fine grained materials; deformation mechanisin; yield stress; grain boundaries; dislocation; modeling;
D O I
10.2320/matertrans.MRA2008012
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A dislocation bow-out model has been developed to explain the strength of ultra-fine grained (UFG) materials with grain size roughly between 20 nm to 500 nm. In the model, perfect dislocations are assumed to be nucleated at grain-boundary sources and bow out between two pinning points on a boundary. Yielding is considered to occur when a dislocation takes a semi-circular shape under applied stress. Statistical consideration is introduced to evaluate the most probable pinning-point distance as a function of grain size. Comparison with experimental results is made for fee UFG metals. It is found that yield stress as well as thermal activation parameters can be explained reasonably by the present theoretical model.
引用
收藏
页码:1278 / 1283
页数:6
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