Breakdown of Schmid's law in micropillars

被引：114

作者：

Ng, K. S. ^{[1
]}

Ngan, A. H. W. ^{[1
]}

机构：

[1] Univ Hong Kong, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China

来源：

SCRIPTA MATERIALIA | 2008年 / 59卷 / 07期

关键词：

schmid's law; plastic deformation; compression test; Monte Carlo techniques; dislocations;

D O I：

10.1016/j.scriptamat.2008.06.019

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The validity of Schmid's law in micropillar samples is assessed by a simulation scheme in which the critical stress to operate a slip system is determined by the free lengths of dislocations pinned by intersection points imposed by dislocations lying on other slip planes. At fixed dislocation density, yielding occurs predominantly on the slip system with the maximum Schmid factor when the sample size is large, but as the sample size reduces, other slip systems have an increasing probability of operating. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：796 / 799

页数：4

共 26 条

[21] Dislocation escape-related size effects in single-crystal micropillars under uniaxial compression [J].

Tang, H. ;

Schwarz, K. W. ;

Espinosa, H. D. .

ACTA MATERIALIA, 2007, 55 (05) :1607-1616

[22] A methodology to investigate size scale effects in crystalline plasticity using uniaxial compression testing [J].

Uchic, MD ;

Dimiduk, DA .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 400 :268-278

[23] Sample dimensions influence strength and crystal plasticity [J].

Uchic, MD ;

Dimiduk, DM ;

Florando, JN ;

Nix, WD .

SCIENCE, 2004, 305 (5686) :986-989

[24] Size effects in the deformation of sub-micron Au columns [J].

Volkert, C. A. ;

Lilleodden, E. T. .

PHILOSOPHICAL MAGAZINE, 2006, 86 (33-35) :5567-5579

[25] Three-dimensional dislocation dynamics simulation of the influence of sample size on the stress-strain behavior of fcc single-crystalline pillars [J].

Weygand, D. ;

Poignant, M. ;

Gumbsch, P. ;

Kraft, O. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2008, 483-84 :188-190

[26] Molecular dynamics study on compressive yield strength in Ni3Al micro-pillars [J].

Zuo, L. ;

Ngan, A. H. W. .

PHILOSOPHICAL MAGAZINE LETTERS, 2006, 86 (06) :355-365

← 1 2 3 →