In-situ formed heterogeneous grain structure in spark-plasma-sintered CoCrFeMnNi high-entropy alloy overcomes the strength-ductility trade-off

被引：46
|
作者：
Jiang, Feilong [1 ,2 ]
Zhao, Cancan [1 ]
Liang, Dingshan [1 ,3 ]
Zhu, Weiwei [1 ,4 ]
Zhang, Yiwen [1 ]
Pan, Shuai [1 ,4 ]
Ren, Fuzeng [1 ]
机构：
[1] Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin, Heilongjiang, Peoples R China
[3] Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Kowloon, Clear Water Bay, Hong Kong, Peoples R China
[4] Univ Macau, Inst Appl Phys & Mat Engn, Fac Sci & Technol, Macau, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 771卷
关键词：
Heterogeneous grain structure; High-entropy alloy; Mechanical properties; MECHANICAL-PROPERTIES; DEFORMATION; MICROSTRUCTURE; PLASTICITY; DEPENDENCE; STABILITY; EVOLUTION;
D O I：
10.1016/j.msea.2019.138625
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The conflict between strength and ductility has been a longstanding dilemma for metallic alloys. Herein, we present a facile strategy to overcome the strength-ductility trade-off of face-center-cubic high-entropy alloys (HEM) via the in-situ formation of heterogeneous grain structure, using the high local temperature gradients generated during spark plasma sintering coupled with the 'sluggish diffusion' of HEM. The fabricated CoCrFeMnNi HEA has a heterogeneous structure over a large range of grain size from 140 nm to 5 mu m, which enables a gigapascal yield strength and a uniform elongation of 9.5%. The mechanism responsible for the associated mechanical properties was analyzed.
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页数：6
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