Thermally activated dislocation depinning at a grain boundary in nanocrystalline and ultrafine-grained materials

被引：54
作者：
Kato, Masaharu [1 ]
机构：
[1] Tokyo Inst Technol, Interdisciplinary Grad Sch Sci & Engn, Dept Mat Sci & Engn, Midori Ku, Yokohama, Kanagawa 2268502, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 516卷 / 1-2期
关键词：
Nanocrystalline materials; Ultrafine grained materials; Dislocations; Thermally activated process; Yield strength; STRAIN-RATE SENSITIVITY; DEFORMATION KINETICS; FLOW-STRESS; STRENGTH; BEHAVIOR; TEMPERATURE; PLASTICITY; DUCTILITY; VOLUME; MODEL;
D O I：
10.1016/j.msea.2009.03.035
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
As an attempt to understand the temperature and strain-rate dependence of strength in nanocrystalline and ultrafine-grained materials, thermally activated depinning process has been incorporated into a dislocation bow-out model from a grain boundary. Such quantities as activation energy, activation volume, strain-rate sensitivity and yield strength are discussed and compared with experimental results available in literature. It is found that the present model analysis can reasonably explain the observed characteristics of these quantities. (c) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：276 / 282
页数：7
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