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Materials 2018, 11(8), 1337; https://doi.org/10.3390/ma11081337

Variations of the Elastic Properties of the CoCrFeMnNi High Entropy Alloy Deformed by Groove Cold Rolling

1
Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux, UMR 7239 CNRS, Arts et Métiers ParisTech Campus de Metz, Université de Lorraine, 7 rue Félix Savart, F-57073 Metz, CEDEX 03, France
2
Institut Jean Lamour, UMR 7198 CNRS, Université de Lorraine, Campus ARTEM, F-54011 Nancy, CEDEX 01, France
3
LABoratory of EXcellence Design of Alloy Metals for low-mAss Structures, Université de Lorraine, F-54011 Nancy, CEDEX 01, France
*
Author to whom correspondence should be addressed.
Received: 29 June 2018 / Revised: 26 July 2018 / Accepted: 27 July 2018 / Published: 2 August 2018
(This article belongs to the Special Issue Design of Alloy Metals for Low-Mass Structures)
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Abstract

The variations of the mechanical properties of the CoCrFeMnNi high entropy alloy (HEA) during groove cold rolling process were investigated with the aim of understanding their correlation relationships with the crystallographic texture. Our study revealed divergences in the variations of the microhardness and yield strength measured from samples deformed by groove cold rolling and conventional cold rolling processes. The crystallographic texture analyzed by electron back scattered diffraction (EBSD) revealed a hybrid texture between those obtained by conventional rolling and drawing processes. Though the groove cold rolling process induced a marked strengthening effect in the CoCrFeMnNi HEA, the mechanical properties were also characterized by an unusual decrease of the Young’s modulus as the applied groove cold rolled deformation increased up to about 0.5 before reaching a stabilized value. This decrease of the Young’s modulus was attributed to the increased density of mobile dislocations induced by work hardening during groove cold rolling processing. View Full-Text
Keywords: high entropy alloy; crystallographic texture; groove rolling; elastic properties high entropy alloy; crystallographic texture; groove rolling; elastic properties
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Lohmuller, P.; Peltier, L.; Hazotte, A.; Zollinger, J.; Laheurte, P.; Fleury, E. Variations of the Elastic Properties of the CoCrFeMnNi High Entropy Alloy Deformed by Groove Cold Rolling. Materials 2018, 11, 1337.

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