Nanomechanical Behavior of CoCrFeMnNi High-Entropy Alloy

被引：19
|
作者：
Mridha, Sanghita [1 ]
Das, Santanu [1 ]
Aouadi, Samir [1 ]
Mukherjee, Sundeep [1 ]
Mishra, Rajiv S. [1 ]
机构：
[1] Univ N Texas, Dept Mat Sci & Engn, Denton, TX 76203 USA
来源：
JOM | 2015年 / 67卷 / 10期
关键词：
DISLOCATION NUCLEATION; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; INCIPIENT PLASTICITY; CORROSION PROPERTIES; SINGLE-CRYSTALS; SIZE; NANOINDENTATION; MICROSTRUCTURE; NI3AL;
D O I：
10.1007/s11837-015-1566-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The nanomechanical behavior of the Co20Cr20Fe20Mn20Ni20 high-entropy alloy was investigated in as-cast, rolled, annealed, and thin-film forms. Dislocation nucleation was studied by repeated indents at a low load for each of the different processing conditions. Distinct displacement bursts (pop in) were observed in the loading curve marked by incipient plasticity for all the samples. The as-cast and annealed samples showed pop ins for 100% of the indents, whereas the rolled and thin-film samples showed a much lower fraction of displacement bursts. This was explained by the high density of dislocations for the cold-worked and thin-film conditions. The strong depth dependence of hardness was explained by geometrically necessary dislocations. The nanomechanical behavior and twinned microstructure indicate low stacking-fault energy for this high-entropy alloy.
引用
收藏
页码：2296 / 2302
页数：7
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