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

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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 languageEnglish
Pages (from-to)419-427
Number of pages9
JournalMaterials and Design
Volume131
DOIs
StatePublished - 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.

FundersFunder number
U.S. Department of EnergyDE-AC05-00OR22725
Basic Energy Sciences
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering

    Keywords

    • HEA
    • neutron diffraction
    • texture
    • twinning-mediated deformation
    • work hardening

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