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

页码：2296 / 2302

页数：7

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