Twinning-mediated work hardening and texture evolution in CrCoFeMnNi high entropy alloys at cryogenic temperature

T. K. Liu; Z. Wu; A. D. Stoica; Q. Xie; W. Wu; Y. F. Gao; H. Bei; K. An

doi:10.1016/j.matdes.2017.06.039

Twinning-mediated work hardening and texture evolution in CrCoFeMnNi high entropy alloys at cryogenic temperature

T. K. Liu, Z. Wu, A. D. Stoica, Q. Xie, W. Wu, Y. F. Gao, H. Bei, K. An

Materials Engineering

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

The cryogenic plastic deformation of CrCoFeMnNi high entropy alloy is characterized by three distinct stages based on the change of the work hardening rate. Microstructure and bulk texture at different strain levels were studied by electron backscatter diffraction (EBSD) and neutron diffraction. Our findings indicate that the deformation twins led to the constant work hardening rate at Stage II and resulted in the appearance of 〈115〉//TA texture component, while the dislocation slip was involved all though the entire plastic deformation. The twinning-mediated tensile plastic deformation at cryogenic temperature finally induced the strong {111}-〈112〉 texture component and minor {001}〈110〉 texture component accompanied with twinning-induced {115}〈552〉 texture component.

Original language	English
Pages (from-to)	419-427
Number of pages	9
Journal	Materials and Design
Volume	131
DOIs	https://doi.org/10.1016/j.matdes.2017.06.039
State	Published - Oct 5 2017

Funding

This work was sponsored by Materials and Engineering Division, Basic Energy Sciences (BES), the U.S. Department of Energy (DOE) (Contract No. DE-AC05-00OR22725). EBSD was performed at the Center of Nanophase Materials (CNMS) and neutron scattering at the Spallation Neutron Source (SNS), which are DOE Office of Science User Facilities operated by ORNL.

Keywords

HEA
neutron diffraction
texture
twinning-mediated deformation
work hardening

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10.1016/j.matdes.2017.06.039

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title = "Twinning-mediated work hardening and texture evolution in CrCoFeMnNi high entropy alloys at cryogenic temperature",

abstract = "The cryogenic plastic deformation of CrCoFeMnNi high entropy alloy is characterized by three distinct stages based on the change of the work hardening rate. Microstructure and bulk texture at different strain levels were studied by electron backscatter diffraction (EBSD) and neutron diffraction. Our findings indicate that the deformation twins led to the constant work hardening rate at Stage II and resulted in the appearance of 〈115〉//TA texture component, while the dislocation slip was involved all though the entire plastic deformation. The twinning-mediated tensile plastic deformation at cryogenic temperature finally induced the strong {111}-〈112〉 texture component and minor {001}〈110〉 texture component accompanied with twinning-induced {115}〈552〉 texture component.",

keywords = "HEA, neutron diffraction, texture, twinning-mediated deformation, work hardening",

author = "Liu, {T. K.} and Z. Wu and Stoica, {A. D.} and Q. Xie and W. Wu and Gao, {Y. F.} and H. Bei and K. An",

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AU - Liu, T. K.

AU - Wu, Z.

AU - Stoica, A. D.

AU - Xie, Q.

AU - Wu, W.

AU - Gao, Y. F.

AU - Bei, H.

AU - An, K.

PY - 2017/10/5

Y1 - 2017/10/5

N2 - The cryogenic plastic deformation of CrCoFeMnNi high entropy alloy is characterized by three distinct stages based on the change of the work hardening rate. Microstructure and bulk texture at different strain levels were studied by electron backscatter diffraction (EBSD) and neutron diffraction. Our findings indicate that the deformation twins led to the constant work hardening rate at Stage II and resulted in the appearance of 〈115〉//TA texture component, while the dislocation slip was involved all though the entire plastic deformation. The twinning-mediated tensile plastic deformation at cryogenic temperature finally induced the strong {111}-〈112〉 texture component and minor {001}〈110〉 texture component accompanied with twinning-induced {115}〈552〉 texture component.

AB - The cryogenic plastic deformation of CrCoFeMnNi high entropy alloy is characterized by three distinct stages based on the change of the work hardening rate. Microstructure and bulk texture at different strain levels were studied by electron backscatter diffraction (EBSD) and neutron diffraction. Our findings indicate that the deformation twins led to the constant work hardening rate at Stage II and resulted in the appearance of 〈115〉//TA texture component, while the dislocation slip was involved all though the entire plastic deformation. The twinning-mediated tensile plastic deformation at cryogenic temperature finally induced the strong {111}-〈112〉 texture component and minor {001}〈110〉 texture component accompanied with twinning-induced {115}〈552〉 texture component.

KW - HEA

KW - neutron diffraction

KW - texture

KW - twinning-mediated deformation

KW - work hardening

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JO - Materials and Design

JF - Materials and Design

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Twinning-mediated work hardening and texture evolution in CrCoFeMnNi high entropy alloys at cryogenic temperature

Abstract

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Keywords

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