Biaxial tensile behavior of CoCrFeNi high-entropy alloy under dynamic and proportional loadings

Haoyang LI ¹Liqiang GAO ²Lin QI ¹Yajing FENG ²Jingyu WANG ¹Yulong LI ³Qifeng YU⁴

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作者信息

1. School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China;Shaanxi Key Laboratory of Impact Dynamics and Engineering Applications,Northwestern Polytechnical University,Xi'an 710072,China
2. Shaanxi Key Laboratory of Impact Dynamics and Engineering Applications,Northwestern Polytechnical University,Xi'an 710072,China;School of Civil Aviation,Northwestern Polytechnical University,Suzhou 215699,China
3. School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China;Shaanxi Key Laboratory of Impact Dynamics and Engineering Applications,Northwestern Polytechnical University,Xi'an 710072,China;School of Civil Aviation,Northwestern Polytechnical University,Suzhou 215699,China;NPU Yangzi River Delta Research Institute,Suzhou 215400,China
4. School of Aeronautics,Northwestern Polytechnical University,Xi'an,710072,China
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Abstract

The dynamic failure behavior of CoCrFeNi High-Entropy Alloy(HEA)under plane biaxial stress was investigated in detail.The dynamic biaxial tensile tests were conducted using an Electromagnetic Biaxial Split Hopkinson Tensile Bar(EBSHTB)system.For comparison,the quasi-static uniaxial and biaxial tensile tests,as well as dynamic uniaxial tensile tests,were per-formed respectively.A cruciform specimen suitable for large plastic deformation was designed and employed in the experiments.The Finite Element Method(FEM)verified that the improved cruciform specimen could satisfy the basic requirements.The feasibility of the proposed specimen was further confirmed through loading tests.Finally,the quasi-static and dynamic yield loci of the HEA in the first quadrant of the principal stress space were plotted.The results indicate that the alloy exhibits obvious strain hardening effect and strain rate strengthening effect,the yield locus and plastic work contours can be accurately described by Hill'48 criterion.

Key words

High-entropy alloys/Biaxial tensile test/Cruciform specimen/Electromagnetic split Hop-kinson bar/Digital image correlation

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基金项目

National Natural Science Foundation of China(11922211)

National Natural Science Foundation of China(11832015)

National Natural Science Foundation of China(11527803)

111 Project,China(BP0719007)

Science Challenge Project,China(TZ2018001)

出版年

2024

中国航空学报(英文版)

中国航空学会

中国航空学报(英文版)

CSTPCDCSCDEI

影响因子：0.847

ISSN：1000-9361

参考文献量40

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