Atomistic mechanisms of fatigue in nanocrystalline metals

被引：86

作者：

Farkas, D ^{[1
]}

Willemann, M ^{[1
]}

Hyde, B ^{[1
]}

机构：

[1] Virginia Polytech Inst & State Univ, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.94.165502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the mechanisms of fatigue behavior in nanocrystalline metals at the atomic scale using empirical force laws and molecular level simulations. A combination of molecular statics and molecular dynamics was used to deal with the time scale limitations of molecular dynamics. We show that the main atomistic mechanism of fatigue crack propagation in these materials is the formation of nanovoids ahead of the main crack. The results obtained for crack advance as a function of stress intensity amplitude are consistent with experimental studies and a Paris law exponent of about 2.

引用

页数：4

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