Martensitic transformation in CrCoNi medium-entropy alloy at cryogenic temperature

Muhammad Naeem; Hao Zhou; Haiyan He; Stefanus Harjo; Takuro Kawasaki; Si Lan; Zhenduo Wu; Yuntian Zhu; Xun-Li Wang

doi:10.1063/5.0067268

Author(s)

Hao Zhou
Stefanus Harjo
Takuro Kawasaki
Si Lan
Zhenduo Wu

Related Research Unit(s)

Detail(s)

Original language	English
Article number	131901
Journal / Publication	Applied Physics Letters
Volume	119
Issue number	13
Online published	27 Sept 2021
Publication status	Published - 27 Sept 2021

Link(s)

DOI	DOI https://doi.org/10.1063/5.0067268 Final Published version
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Attachment(s)	Documents 84107796.pdf Final Published version, 6.31 MB, PDF Publisher's Copyright Statement This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Muhammad Naeem, Hao Zhou, Haiyan He, Stefanus Harjo, Takuro Kawasaki, Si Lan, Zhenduo Wu, Yuntian Zhu, and Xun-Li Wang, "Martensitic transformation in CrCoNi medium-entropy alloy at cryogenic temperature", Appl. Phys. Lett. 119, 131901 (2021) and may be found at https://doi.org/10.1063/5.0067268.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85115959645&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(4e5e4cbc-07f9-469f-b74b-43a2d080123e).html

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.