Modulating the prestrain history to optimize strength and ductility in CoCrFeMnNi high-entropy alloy

被引：72
作者：
Sun, S. J. [1 ,2 ]
Tian, Y. Z. [3 ]
Lin, H. R. [1 ,2 ]
Lu, S. [4 ]
Yang, H. J. [1 ]
Zhang, Z. F. [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Mat Fatigue & Fracture Div, Shenyang 110016, Liaoning, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
[3] Northeastern Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110819, Liaoning, Peoples R China
[4] Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden
来源：
SCRIPTA MATERIALIA | 2019年 / 163卷
基金：
中国国家自然科学基金;
关键词：
High-entropy alloy; Prestrain; Temperature; Yield strength; Elongation; CYCLE FATIGUE PROPERTIES; TENSILE PROPERTIES; PRE-STRAIN; BEHAVIOR; PLASTICITY; MICROSTRUCTURE; DEFORMATION; MECHANISMS; EVOLUTION; DESIGN;
D O I：
10.1016/j.scriptamat.2019.01.012
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
CoCrFeMnNi high-entropy alloy (HEA) exhibits excellent combination of strength and ductility, but low yield strength. In order to ameliorate the mechanical properties, prestrain was applied in this work. The HEA prestrained at 77 K possesses higher yield strength and uniform elongation than the HEA prestrained at 293 K, indicating that the trade-off relationship between strength and ductility can be broken by modulating the prestrain history. Furthermore, the yield point phenomenon was disappeared after prestrained at 77 K. This can be related to the density and distribution of dislocations as imposed in the prestrain process at 293 K and 77 K. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：111 / 115
页数：5
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