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

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.

Nanoindentation behavior of high entropy alloys with transformation-induced plasticity

“…Finally, worth mentioning is that nanoindentation behavior is also influenced by crystallographic texture effects 54,55 and interfaces other than grain boundaries (e.g., phase and twin boundaries), although these aspects were not studied in detail in the present study.…”

Investigation and Composition Characterization of a “NiTi-like” Alloy Combining High Temperature Shape Memory and High Entropy

“…The equiatomic fraction, proposed in the first work on multi-component alloys, is no longer mandatory [3]. A recent work suggests several predictability criteria for the formation of cold workable single-phase solid solution: valence electron concentration (VEC), the enthalpy of mixing (DH), electronegativity difference, atomic size difference [5][6][7][8][9][10].…”

Spinodal Decomposition and Mechanical Response of a TiZrNbTa High-Entropy Alloy

“…In the past decade, high-entropy alloys (HEAs) have become promising materials because of their new concepts of alloy design [1,2,3,4,5]. Unlike conventional alloys, which are based on one major element, HEAs comprise multiple elements in equiatomic or near-equiatomic ratios, and tend to form a simple solid solution instead of complex phases or intermetallic compounds [6,7]. Such a concept opens up new possibilities for advanced alloy design.…”