Dynamic aspects of dislocation motion: atomistic simulations

被引：78

作者：

Bitzek, E

Gumbsch, P

机构：

[1] Univ Karlsruhe, TH, Inst Zuverlassigkeit Bauteilen & Systemen, D-76131 Karlsruhe, Germany

[2] IWM, Fraunhofer Inst Werkstoffmech, D-79108 Freiburg, Germany

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 400卷

关键词：

dislocation dynamics; dislocation drag; inertia; dislocation-obstacle interaction; atomistic simulation; line tension model;

D O I：

10.1016/j.msea.2005.03.047

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Atomistic simulations of accelerating edge and screw dislocations were carried out to study the dynamics of dislocations in a face centered cubic metal. Using two different embedded atom potentials for nickel and a simple slab geometry, the Peierls stress, the effective mass, the line tension and the drag coefficient were determined. A dislocation intersecting an array of voids is used to study dynamic effects in dislocation-obstacle interactions. A pronounced effect caused by inertial overshooting is found. A dynamic line tension model is developed which reproduces the simulation results. The model can be used to easily estimate the magnitude of inertial effects in the interaction of dislocations with localized obstacles for different obstacle strengths, -spacings and temperatures. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：40 / 44

页数：5

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