Dislocation dynamics in hexagonal close-packed crystals

被引：32

作者：

Aubry, S. ^{[1
]}

Rhee, M. ^{[1
]}

Hommes, G. ^{[1
]}

Bulatov, V. V. ^{[1
]}

Arsenlis, A. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA

来源：

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS | 2016年 / 94卷

关键词：

Dislocation dynamics; Hexagonal close-packed; Composites dislocations; HCP METALS; SLIP SYSTEMS; SIMULATIONS; MAGNESIUM; ALLOYS; DEFORMATION; JUNCTIONS; STRENGTH;

D O I：

10.1016/j.jmps.2016.04.019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Extensions of the dislocation dynamics methodology necessary to enable accurate simulations of crystal plasticity in hexagonal close-packed (HCP) metals are presented. They concern the introduction of dislocation motion in HCP crystals through linear and nonlinear mobility laws, as well as the treatment of composite dislocation physics. Formation, stability and dissociation of < c + a > and other dislocations with large Burgers vectors defined as composite dislocations are examined and a new topological operation is proposed to enable their dissociation. The results of our simulations suggest that composite dislocations are omnipresent and may play important roles both in specific dislocation mechanisms and in bulk crystal plasticity in HCP materials. While fully microscopic, our bulk DD simulations provide wealth of data that can be used to develop and parameterize constitutive models of crystal plasticity at the mesoscale. Published by Elsevier Ltd.

引用

页码：105 / 126

页数：22

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