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 charcateristics. 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 low-temperature heat treatment. This was accompanied with partial recovery of dislocations. As a result, the room-temperature mechanical properties of the pre-strained and recovered alloy were improved substantially.

Keywords: high-entropy alloys, twinning, recovery, strain hardening, ductility

Suggested Citation: Suggested Citation

Bouaziz, Olivier and Moon, Jongun and Kim, Hyoung Seop and Estrin, Yuri, Twinning Engineering of a CoCrFeMnNi High-Entropy Alloy. Available at SSRN: https://ssrn.com/abstract=3762198 or http://dx.doi.org/10.2139/ssrn.3762198