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Journal Articles Scripta Materialia Year : 2021

Twinning Engineering of a CoCrFeMnNi High-Entropy Alloy


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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hal-03542064 , version 1 (09-03-2023)


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