Atypical three-stage-hardening mechanical behavior of CU single-crystal micropillars

被引：27

作者：

Liu, Z. L. ^{[1
]}

Liu, X. M. ^{[1
]}

Zhuang, Z. ^{[1
]}

You, X. C. ^{[1
]}

机构：

[1] Tsinghua Univ, Dept Engn Mech, Sch Aerosp, Beijing 100084, Peoples R China

来源：

SCRIPTA MATERIALIA | 2009年 / 60卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Dislocation dynamics; Spiral sources; Dislocation networks; Dislocation starvation hardening; THIN METAL-FILMS; DEFORMATION; PLASTICITY; DEPENDENCE; STRENGTH; SCALE;

D O I：

10.1016/j.scriptamat.2008.12.020

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Three-dimensional discrete dislocation dynamics simulations have been used to study the stress-strain response of Cu single-crystal micropillars containing initial dislocation networks. When such networks are loaded, we find that the stress-strain curve can be divided into three distinct stages: a linear elastic stage, a normal strain hardening stage and a "dislocation starvation hardening" stage accompanying a rather high stress level. Finally, a perfect dislocation-free pillar is obtained in our simulations. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：594 / 597

页数：4

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