Dislocation cross-slip in nanocrystalline fcc metals

被引：60

作者：

Bitzek, E. ^{[1
]}

Brandl, C. ^{[1
]}

Derlet, P. M. ^{[1
]}

Van Swygenhoven, H. ^{[1
]}

机构：

[1] Paul Scherrer Inst, ASQ NUM, CH-5232 Villigen, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.100.235501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Constant strain rate molecular dynamics simulations of nanocrystalline Al demonstrate that a significant amount of dislocations that have nucleated at the grain boundaries, exhibit cross-slip via the Fleischer mechanism as they propagate through the grain. The grain boundary structure is found to strongly influence when and where cross-slip occurs, allowing the dislocation to avoid local stress concentrations that otherwise can act as strong pinning sites for dislocation propagation.

引用

页数：4

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