Dynamic deformation behavior of a face-centered cubic FeCoNiCrMn high-entropy alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Junyang He
  • Qi Wang
  • Husheng Zhang
  • Lanhong Dai
  • Toshiji Mukai
  • Yuan Wu
  • Xiongjun Liu
  • Hui Wang
  • Zhaoping Lu

Detail(s)

Original languageEnglish
Pages (from-to)362-368
Journal / PublicationScience Bulletin
Volume63
Issue number6
Online published31 Jan 2018
Publication statusPublished - 30 Mar 2018
Externally publishedYes

Abstract

In this study, mechanical tests were conducted on a face-centered cubic FeCoNiCrMn high-entropy alloy, both in tension and compression, in a wide range of strain rates (10−4–104 s−1) to systematically investigate its dynamic response and underlying deformation mechanism. Materials with different grain sizes were tested to understand the effect of grain size, thus grain boundary volume, on the mechanical properties. Microstructures of various samples both before and after deformation were examined using electron backscatter diffraction and transmission electron microscopy. The dislocation structure as well as deformation-induced twins were analyzed and correlated with the measured mechanical properties. Plastic stability during tension of the current high-entropy alloy (HEA), in particular, at dynamic strain rates, was discussed in lights of strain-rate sensitivity and work hardening rate. It was found that, under dynamic conditions, the strength and uniform ductility increased simultaneously as a result of the massive formation of deformation twins. Specifically, an ultimate tensile strength of 734 MPa and uniform elongation of ∼63% are obtained at 2.3 × 103 s−1, indicating that the alloy has great potential for energy absorption upon impact loading.

Research Area(s)

  • Deformation twinning, Dynamic deformation, High-entropy alloys, Plastic stability, Work-hardening

Citation Format(s)

Dynamic deformation behavior of a face-centered cubic FeCoNiCrMn high-entropy alloy. / He, Junyang; Wang, Qi; Zhang, Husheng; Dai, Lanhong; Mukai, Toshiji; Wu, Yuan; Liu, Xiongjun; Wang, Hui; Nieh, Tai-Gang; Lu, Zhaoping.

In: Science Bulletin, Vol. 63, No. 6, 30.03.2018, p. 362-368.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review