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

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^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

22 Citations (Scopus)

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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.

Original language	English
Article number	131901
Journal	Applied Physics Letters
Volume	119
Issue number	13
Online published	27 Sept 2021
DOIs	https://doi.org/10.1063/5.0067268
Publication status	Published - 27 Sept 2021

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COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: 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.

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title = "Martensitic transformation in CrCoNi medium-entropy alloy at cryogenic temperature",

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.",

author = "Muhammad Naeem and Hao Zhou and Haiyan He and Stefanus Harjo and Takuro Kawasaki and Si Lan and Zhenduo Wu and Yuntian Zhu and Xun-Li Wang",

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AU - Naeem, Muhammad

AU - Zhou, Hao

AU - He, Haiyan

AU - Harjo, Stefanus

AU - Kawasaki, Takuro

AU - Lan, Si

AU - Wu, Zhenduo

AU - Zhu, Yuntian

AU - Wang, Xun-Li

PY - 2021/9/27

Y1 - 2021/9/27

N2 - 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.

AB - 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.

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U2 - 10.1063/5.0067268

DO - 10.1063/5.0067268

M3 - RGC 21 - Publication in refereed journal

SN - 0003-6951

VL - 119

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 13

M1 - 131901

ER -

Martensitic transformation in CrCoNi medium-entropy alloy at cryogenic temperature

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JLFS: Isotope Substitution to Enable Precise Structure Determination at China Spallation Neutron Source

GRF: In-situ Neutron Diffraction Study to Understand the Microscopic Origin of Deformation in High-entropy Alloys

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Martensitic transformation in CrCoNi medium-entropy alloy at cryogenic temperature

Abstract

Publisher's Copyright Statement

RGC Funding Information

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Projects

GRF: Ultrastrong Dual-phase Heterostructure Low C.rbon Steel Reinforced by Ultra Nano Lamellae

JLFS: Isotope Substitution to Enable Precise Structure Determination at China Spallation Neutron Source

GRF: In-situ Neutron Diffraction Study to Understand the Microscopic Origin of Deformation in High-entropy Alloys

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