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

被引：115

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

页码：208 / 213

页数：6

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