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

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外文摘要：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.

外文关键词：

High-entropy alloysBiaxial tensile testCruciform specimenElectromagnetic split Hop-kinson barDigital image correlation

作者：

Haoyang LI、Liqiang GAO、Lin QI、Yajing FENG、Jingyu WANG、Yulong LI、Qifeng YU

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作者单位：

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

School of Aeronautics,Northwestern Polytechnical University,Xi'an,710072,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China111 Project,ChinaScience Challenge Project,China

项目编号：

119222111183201511527803BP0719007TZ2018001

出版年：

2024

DOI：

10.1016/j.cja.2024.06.003

中国航空学报(英文版)

中国航空学会

中国航空学报(英文版)

CSTPCDEI

影响因子：0.847

ISSN：1000-9361

年,卷(期)：2024.37(9)