High-velocity deformation of Al0.3CoCrFeNi high-entropy alloy: Remarkable resistance to shear failure

被引：278
作者：
Li, Z. [1 ]
Zhao, S. [1 ]
Diao, H. [2 ]
Liaw, P. K. [2 ]
Meyers, M. A. [1 ]
机构：
[1] Univ Calif San Diego, Mat Sci & Engn Program, San Diego, CA 92093 USA
[2] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
来源：
SCIENTIFIC REPORTS | 2017年 / 7卷
基金：
美国国家科学基金会;
关键词：
STACKING-FAULT ENERGIES; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; STRAIN-RATE; MICROSTRUCTURAL EVOLUTION; DYNAMIC DEFORMATION; FATIGUE BEHAVIOR; FLOW BEHAVIOR; TEXTURE; RECRYSTALLIZATION;
D O I：
10.1038/srep42742
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The mechanical behavior of a single phase (fcc) Al0.3CoCrFeNi high-entropy alloy (HEA) was studied in the low and high strain-rate regimes. The combination of multiple strengthening mechanisms such as solid solution hardening, forest dislocation hardening, as well as mechanical twinning leads to a high work hardening rate, which is significantly larger than that for Aland is retained in the dynamic regime. The resistance to shear localization was studied by dynamically-loading hat-shaped specimens to induce forced shear localization. However, no adiabatic shear band could be observed. It is therefore proposed that the excellent strain hardening ability gives rise to remarkable resistance to shear localization, which makes this material an excellent candidate for penetration protection applications such as armors.
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页数：8
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