Publications

Tensile creep properties of a CrMnFeCoNi high-entropy alloy

Zhang, M. and George, E.P. and Gibeling, J.C.

SCRIPTA MATERIALIA
Volume: 194 Pages:
DOI: 10.1016/j.scriptamat.2020.113633
Published: 2021

Abstract
Tensile creep tests were performed on a CrMnFeCoNi high-entropy alloy at temperatures from 1023 K to 1173 K. A uniform stress exponent 3.7 ± 0.1 was found across all temperatures. The apparent activation energies of creep under various applied stresses were determined to be around 230 kJ/mol and decrease with increasing stress, indicating a stress-assisted, thermally activated behavior. Steady-state creep microstructures feature no subgrain formation and high dislocation density within grains. Based on our results, the creep rate of CrMnFeCoNi is believed to be controlled by both dislocation-dislocation interactions and dislocation-lattice interactions. © 2020

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