High rate straining of tantalum and copper

被引：33

作者：

Armstrong, R. W. ^{[1
]}

Zerilli, F. J. ^{[2
]}

机构：

[1] Univ Maryland, Dept Mech Engn, College Pk, MD 20742 USA

[2] NSWC IHD, Silver Spring, MD 20904 USA

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2010年 / 43卷 / 49期

关键词：

CONSTITUTIVE RELATIONS; DEFORMATION; CRYSTALS;

D O I：

10.1088/0022-3727/43/49/492002

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

High strain rate measurements reported recently for several tantalum and copper crystal/polycrystal materials are shown to follow dislocation mechanics-based constitutive relations, first at lower strain rates, for dislocation velocity control of the imposed plastic deformations and, then at higher rates, transitioning to nano-scale dislocation generation control by twinning or slip. For copper, there is the possibility of added-on slip dislocation displacements to be accounted for from the newly generated dislocations.

引用

页数：5

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