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Formation of a hexagonal closed-packed phase in Al0.5CoCrFeNi high entropy alloy

Published online by Cambridge University Press:  09 October 2017

J. Wang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China
Y. Zhang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China
S.Z. Niu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China
W.Y. Wang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China
H.C. Kou
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China
J.S. Li
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, China
S.Q. Wang
Affiliation:
School of Materials Science and Engineering, Xi'an Shiyou University, 18 Dianzi Road, Xi'an Shaanxi 710065, China
E. Beaugnon
Affiliation:
University Grenoble Alps, LNCMI, F-38000 Grenoble, France CNRS, LNCMI, F-38000 Grenoble, France
Corresponding
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Abstract

We report that a hexagonal closed-packed (HCP) phase with high cobalt content precipitates in Al0.5CoCrFeNi high entropy alloy (HEA) after 650 °C/8 h heat-treatment. The precipitate with the shape of plate is completely located at the interdendritic region. Results of electron diffraction and high resolution transmission electron microscopy show that the HCP phase was transformed from the body-centered cubic phase through a simple shear and the two phase obey an orientation relationship. The thermodynamic stability of Al0.5CoCrFeNi HEA should be carefully reevaluated, especially at the vulnerable temperature.

Type
Research Letters
Copyright
Copyright © Materials Research Society 2017 

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