Scale dependence of mechanical properties of single crystals under uniform deformation

被引：83

作者：

Benzerga, AA ^{[1
]}

Shaver, NF ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Aerosp Engn, College Stn, TX 77843 USA

来源：

SCRIPTA MATERIALIA | 2006年 / 54卷 / 11期

关键词：

dislocations; mechanical properties-yield phenomena; theory and modeling; strain-gradient plasticity;

D O I：

10.1016/j.scriptamat.2006.02.003

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Mechanism-based discrete dislocation plasticity is used to investigate the effect of size on micro-scale crystal plasticity under nominally uniform compression. Constitutive rules are used which include a physical representation of dislocation Sources and obstacles in the undeformed samples. The simulations predict a strong size dependence of the material flow stress and reproduce the main features of recent experiments. Possible operating mechanisms are identified which highlight the interplay between sample dimensions, internal stresses and the length and time scales inherent to dislocation generation and motion. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1937 / 1941

页数：5

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