Martensitic transformation in CrCoNi medium-entropy alloy at cryogenic temperature

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

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Author(s)

  • Hao Zhou
  • Stefanus Harjo
  • Takuro Kawasaki
  • Si Lan
  • Zhenduo Wu

Detail(s)

Original languageEnglish
Article number131901
Journal / PublicationApplied Physics Letters
Volume119
Issue number13
Online published27 Sep 2021
Publication statusPublished - 27 Sep 2021

Abstract

We investigated the in situ deformation behavior of the CrCoNi medium-entropy alloy at a cryogenic temperature of 140K and compared it with deformation at room temperature. The sample exhibited higher strength and larger ductility at the cryogenic temperature. The CrCoNi alloy remained single-phase face-centered cubic at room temperature, while deformation at 140K resulted in a martensitic transformation to the hexagonal close-packed structure. The phase transformation, an additional deformation mechanism to stacking faults, twinning, and dislocation slip, resulted in a higher work hardening at cryogenic temperature. The study addresses the structure metastability in the CrCoNi alloy, which led to the formation of epsilon-martensite from the intrinsic stacking faults.

Citation Format(s)

Martensitic transformation in CrCoNi medium-entropy alloy at cryogenic temperature. / Naeem, Muhammad; Zhou, Hao; He, Haiyan; Harjo, Stefanus; Kawasaki, Takuro; Lan, Si; Wu, Zhenduo; Zhu, Yuntian; Wang, Xun-Li.

In: Applied Physics Letters, Vol. 119, No. 13, 131901, 27.09.2021.

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