Superplastic-like flow in a fine-grained equiatomic CoCrFeMnNi high-entropy alloy

被引：75
作者：
Reddy, S. R. [1 ]
Bapari, S. [2 ]
Bhattacharjee, P. P. [1 ]
Chokshi, A. H. [2 ]
机构：
[1] IIT Hyderabad, Dept Mat Sci & Met Engn, Hyderabad, Andhra Prades, India
[2] India Inst Sci, Dept Mat Engn, Bengaluru 560012, Karnataka, India
来源：
MATERIALS RESEARCH LETTERS | 2017年 / 5卷 / 06期
关键词：
High-entropy alloys; superplasticity; strain rate sensitivity; texture; cavitation; NANOCRYSTALLINE; MICROSTRUCTURE; BEHAVIOR; STABILITY; EVOLUTION; TEXTURE; CREEP;
D O I：
10.1080/21663831.2017.1305460
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A CoCrFeMnNi high-entropy alloy (HEA) showed elongation to failure similar to 320% at T = 1023 K and a strain rate. epsilon = 10(-4) s(-1). Strain hardening and texture weakening occurred at low. e, whereas flow softening and texture strengthening were observed at high. epsilon (> 3 x 10(-2) s(-1)) experiments. The strain rate sensitivity (m) decreased from 0.5 to similar to 0.25 with increasing. epsilon. Deformation with m similar to 0.5 and deformation-enhanced grain growth at low. e indicated superplasticity associated with grain boundary sliding. The grain boundary diffusion coefficient diminished by a factor of similar to 4 in the HEA. Concurrent nucleation, growth and cavity interlinkage caused premature failure compared with conventional superplastic alloys. [GRAPHICS] IMPACT STATEMENT FCC CoCrFeMnNi HEA shows superplastic-like flow with similar to 320% elongation at 1023 K and 10(-4) s(-1) strain rate originating from grain boundary sliding.
引用
收藏
页码：408 / 414
页数：7
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