Twinning Engineering of a CoCrFeMnNi High-Entropy Alloy

Jongun Moon, Olivier Bouaziz, Hyoung Seop Kim, Yuri Estrin

Research output: Contribution to journalArticle

Abstract

Deformation-induced twinning has been a notable example of overcoming the strength/ductility trade-off dilemma as a strengthening mechanism. By borrowing this concept from the area of TWIP steels, we designed a thermomechanical treatment for a CoCrFeMnNi high-entropy alloy to improve its mechanical characteristics. We used pre-straining at 77 K to introduce deformation-induced twins in the microstructure of the alloy, and then recovered it by annealing at 773 K, while avoiding recrystallization. The deformation-induced twins generated by pre-straining at 77 K were retained after this heat treatment, whilst partial recovery of dislocations occurred. As a result, the room-temperature mechanical properties of the alloy, including its strain hardening ability, were improved substantially.

Original languageEnglish
Article number113808
JournalScripta Materialia
Volume197
DOIs
Publication statusPublished - May 2021

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