Orientation-dependent hardness and strain rate sensitivity in nanotwin copper

被引：56

作者：

Ye, J. C. ^{[1
]}

Wang, Y. M. ^{[1
]}

Barbee, T. W., Jr. ^{[1
]}

Hamza, A. V. ^{[1
]}

机构：

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

来源：

APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 26期

关键词：

ACTIVATION VOLUME; TENSILE PROPERTIES; GRAINED CU; NANOCRYSTALLINE; DEFORMATION; DUCTILITY; FCC; DISLOCATIONS; TEMPERATURE; STRENGTH;

D O I：

10.1063/1.4731242

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We observe a strong twin-orientation dependent hardness and strain rate sensitivity (m) in nanotwin copper. A highest m value of 0.059 +/- 0.004 and an activation volume (V) of similar to 10b(3) are measured when deformation is predominately vertical to twin boundaries (TBs), whereas a much smaller m and larger V are observed for the direction parallel to TBs. Dislocation density is found to have a stronger impact on m and V in nanotwin materials, compared to that in coarse-grained materials. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4731242]

引用

页数：5

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