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

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

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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 performed 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.

Original languageEnglish
Pages (from-to)475-489
Number of pages15
JournalChinese Journal of Aeronautics
Volume37
Issue number9
DOIs
StatePublished - Sep 2024

Keywords

  • Biaxial tensile test
  • Cruciform specimen
  • Digital image correlation
  • Electromagnetic split Hopkinson bar
  • High-entropy alloys

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