Strain softening in nanocrystalline or ultrafine-grained metals: A mechanistic explanation

被引：44

作者：

Tang, Feng ^{[1
]}

Schoenung, Julie M. ^{[1
]}

机构：

[1] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 493卷 / 1-2期

关键词：

nanocrystalline materials; ultrafine-grained materials; plastic deformation; strain softening; residual stresses; dislocations;

D O I：

10.1016/j.msea.2007.08.086

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A mechanism which is based on the formation of residual internal stresses caused by dislocation creation and absorption at grain boundaries is proposed to explain the unique strain softening phenomenon in nanocrystalline and ultrafine-grained metals. With the residual internal stresses caused by plastic deformation in individual grains, in order to create new dislocations at grain boundaries for further plastic deformation, lower external stress is required when compared with that without the residual internal stress field, which results in strain softening. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：101 / 103

页数：3

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