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Twinning Engineering of a CoCrFeMnNi High-Entropy Alloy

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.
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https://hal.univ-lorraine.fr/hal-03542064
Contributor : Jérôme Slowensky Connect in order to contact the contributor
Submitted on : Tuesday, January 25, 2022 - 10:16:37 AM
Last modification on : Friday, April 1, 2022 - 3:57:32 AM

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Jongun Moon, Olivier Bouaziz, Hyoung Seop Kim, Yuri Estrin. Twinning Engineering of a CoCrFeMnNi High-Entropy Alloy. Scripta Materialia, Elsevier, 2021, 197, pp.113808. ⟨10.1016/j.scriptamat.2021.113808⟩. ⟨hal-03542064⟩

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