Mechanical response and deformation behavior of Al0.6CoCrFeNi high-entropy alloys upon dynamic loading

被引：104
作者：
Wang, L. [1 ,2 ]
Qiao, J. W. [3 ]
Ma, S. G. [1 ,2 ]
Jiao, Z. M. [1 ,2 ]
Zhang, T. W. [1 ,2 ]
Chen, G. [1 ,2 ]
Zhao, D. [1 ,2 ]
Zhang, Y. [4 ]
Wang, Z. H. [1 ,2 ]
机构：
[1] Taiyuan Univ Technol, Inst Appl Mech & Biomed Engn, Taiyuan 030024, Shanxi, Peoples R China
[2] Taiyuan Univ Technol, Coll Mech, Shanxi Key Lab Mat Strength & Struct Impact, Taiyuan 030024, Shanxi, Peoples R China
[3] Taiyuan Univ Technol, Coll Mat Sci & Engn, Inst High Entropy Alloys, Taiyuan 030024, Shanxi, Peoples R China
[4] Univ Sci & Technol Beijing, State key Lab Adv Met & Mat, Beijing, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 727卷
基金：
美国国家科学基金会;
关键词：
High entropy alloy; Dynamic loading; Deformation twins; Mechanical property; HIGH-STRAIN-RATE; STAINLESS-STEEL; MICROSTRUCTURE; ELEMENTS; STRESS; DESIGN; ENERGY; FLOW;
D O I：
10.1016/j.msea.2018.05.001
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The mechanical properties and microstructure evolution of dual-phase Al0.6CoCrFeNi high-entropy alloys (HEM) upon dynamic loading are investigated. Dynamic impact tests with varying strain rates of 2800-4000 s(-1) at room temperature are performed by the split-Hopkinson pressure bar (SHPB). The yielding strengths evidently increase with increasing the strain rate for the present system. The high strain-rate sensitivity (SRS) parameter is extracted from the observed stress-strain responses. A modified Johnson-Cook (J-C) plasticity constitutive model is proposed to characterize the dynamic flow behavior. Nanoscale deformation twins induced by dynamic loading, accompanied by high density dislocation substructures, realize the excellent strength-ductility combination. According to the critical stress theory, the stacking fault energy (SFE) of the FCC phase can be estimated to be about 36 mJ/m(2), which is evidently lower than the overall SFE for the Al0.6CoCrFeNi HEA.
引用
收藏
页码：208 / 213
页数：6
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