Anomalous dislocation multiplication in FCC metals

被引：57

作者：

de Koning, M ^{[1
]}

Cai, W ^{[1
]}

Bulatov, VV ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.91.025503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Direct atomistic simulations of dislocation multiplication in fcc aluminum reveal an unexpected mechanism, in which a Frank-Read source emits dislocations with Burgers vectors different from that of the source itself. The mechanism is traced to a spontaneous nucleation of partial dislocation loops within the stacking fault. Understanding and a quantitative description of this unusual process are achieved through the development of a continuum model for dislocation nucleation based on the coarse-grained dislocation dynamics approach and a minimal amount of atomistic input.

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页数：4

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