Generalized planar fault energies and twinning in Cu-Al alloys

被引：92
作者：
Kibey, S.
Liu, J. B.
Johnson, D. D.
Sehitoglu, H.
机构：
[1] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA
[2] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA
来源：
APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 19期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1063/1.2387133
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report ab initio density functional theory calculations of generalized planar fault energies of fcc Cu-xAl (x=0, 5.0, and 8.3 at. %) alloys. We investigate the effects of substitutional solute Al on the unstable intrinsic gamma(us) and twin gamma(ut) stacking fault energies (SFEs). Our results reveal an increased tendency of Cu-Al to deform preferentially by twinning with increasing Al content, consistent with experiment. We attribute this mechanical behavior to appreciable lowering of the twinning barrier gamma(ut), along with the stable intrinsic and twin SFEs.
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页数：3
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