Interplay of dislocation slip and deformation twinning in tantalum at high strain rates

被引：35

作者：

Chen, C. Q. ^{[1
,2
]}

Hu, G. ^{[1
,2
]}

Florando, J. N. ^{[3
]}

Kumar, M. ^{[3
]}

Hemker, K. J. ^{[1
,2
]}

Ramesh, K. T. ^{[1
,2
]}

机构：

[1] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA

[2] Johns Hopkins Univ, Hopkins Extreme Mat Inst, Baltimore, MD 21218 USA

[3] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

来源：

SCRIPTA MATERIALIA | 2013年 / 69卷 / 10期

关键词：

bcc tantalum; Dynamic deformation; Dominant shear deformation; Twinning; Slip-twinning interplay;

D O I：

10.1016/j.scriptamat.2013.07.010

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Deformation twinning was introduced in Ta through dynamic compression shear and uniaxial compression at high strain rates up to similar to 10(4) s(-1) at low temperatures. Under dominant shear, the specimens showed continuous strain softening at high rates, and the deformation twins showed anomalous and highly irregular morphologies. Under compression, deformation twins appeared as typical straight and thin plates accompanied by considerable strain hardening in mechanical response. The results are correlated with the interplay of slip and deformation twinning unique for body-centered cubic metals. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：709 / 712

页数：4

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