Severe warm-rolling mediated microstructure and texture of equiatomic CoCrFeMnNi high entropy alloy: A comparison with cold-rolling

J, Saha and G, Ummethala and Malladi, S R K and Bhattacharjee, Pinaki Prasad (2021) Severe warm-rolling mediated microstructure and texture of equiatomic CoCrFeMnNi high entropy alloy: A comparison with cold-rolling. Intermetallics (129). ISSN 0966-9795

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Abstract

The effect of severe warm-rolling on the microstructure and texture development in FCC equiatomic CoCrFeMnNi HEA was investigated in the present work. For this purpose, the HEA was warm-rolled to 90% reduction in thickness at 600 °C and annealed for 1 h at temperatures up to 1200 °C. To highlight the effect of warm-rolling, a critical comparison was made with similarly deformed and annealed cold-rolled HEA. The warm-rolled HEA showed an ultrafine lamellar microstructure, which was, however, significantly coarser than the cold-rolled HEA. The significantly coarser microstructure in the warm-rolled HEA could be attributed to the dynamic annihilation of dislocations during deformation. Warm-rolled HEA showed a pure metal or copper type texture instead of a predominantly brass type texture in the cold-rolled HEA. The stark differences in the deformation texture could be attributed to the increase in the SFE at the temperature of warm-rolling, which promoted more homogeneous deformation by dislocation slip over twin mediated deformation and extensive shear band formation. The lower stored energy and coarser deformation structure of the warm-rolled HEA resulted in higher recrystallization temperature, and consistently larger recrystallized grain size than the cold-rolled HEA. Annealing also resulted in the weakening of the recrystallization texture owing to the absence of strong preferential nucleation or growth. The HEA warm-rolled and annealed at 750 °C resulted in a fine-grained, completely recrystallized microstructure with the optimum strength-ductility combination. The present results revealed that warm-rolling could be effectively used as a processing route for tailoring microstructure and properties of CoCrFeMnNi HEA.

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IITH Creators:

IITH Creators	ORCiD
Bhattacharjee, Pinaki Prasad	http://orcid.org/0000-0002-6422-2601

Item Type:

Article

Uncontrolled Keywords:

Annealing,Cold rolling,Deformation,High-entropy alloys,Metal cladding,Recrystallization (metallurgy), Deformation structure,Homogeneous deformation,Lamellar microstructure,Microstructure and properties,Recrystallization temperatures, Recrystallization texture,Recrystallized grain sizes and Recrystallized microstructures

Subjects:

Materials Engineering > Nanostructured materials, porous materials
Materials Engineering > Composite materials

Divisions:

Department of Material Science Engineering

Depositing User:

Team Library

Date Deposited:

22 Dec 2020 09:56

Last Modified:

22 Dec 2020 09:56

URI:

http://raiithold.iith.ac.in/id/eprint/7625