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...

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Bibliographic Details
Published inScripta materialia Vol. 197; p. 113808
Main Authors Moon, Jongun, Bouaziz, Olivier, Kim, Hyoung Seop, Estrin, Yuri
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2021
Elsevier
Subjects
Ductility
High-entropy alloys
Physics
Recovery
Strain hardening
Twinning
High-entropy alloys
Twinning
Ductility
Recovery
Strain hardening
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Summary: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. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2021.113808