Structure Modulation Driven by Cyclic Deformation in Nanocrystalline NiFe

被引：82

作者：

Cheng, Sheng ^{[1
,2
]}

Zhao, Yonghao ^{[3
]}

Wang, Yinmin ^{[4
]}

Li, Ying ^{[3
]}

Wang, Xun-Li ^{[2
]}

Liaw, Peter K. ^{[1
]}

Lavernia, Enrique J. ^{[3
]}

机构：

[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[2] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

[3] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA

[4] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 25期

关键词：

GROWTH; METALS;

D O I：

10.1103/PhysRevLett.104.255501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Theoretical modeling suggests that the grain size remains unchanged during fatigue crack growth in nanocrystalline metals. Here we demonstrate that a modulated structure is generated in a nanocrystalline Ni-Fe alloy under cyclic deformation. Substantial grain coarsening and loss of growth twins are observed in the path of fatigue cracks, while the grains away from the cracks remain largely unaffected. Statistical analyses suggest that the grain coarsening is realized through the grain lattice rotation and coalescence and the loss of growth twins may be related to the detwinning process near crack tip.

引用

页数：4

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