Saha, J. and Bhattacharjee, Pinaki Prasad
(2021)
Influences of Thermomechanical Processing by Severe Cold and Warm Rolling on the Microstructure, Texture, and Mechanical Properties of an Equiatomic CoCrNi Medium-Entropy Alloy.
Journal of Materials Engineering and Performance, 30 (12).
pp. 8956-8971.
ISSN 1059-9495
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Abstract
An attempt was made to illustrate the effects of microstructure, texture, and properties in heavy cold- and warm-rolled equiatomic CoCrNi MEAs during deformation and subsequent annealing. The MEA was cold-rolled (CR) at ambient temperature and warm-rolled at 400 (WR(400)) and 600 °C (WR(600)) to reduce the thickness by 90%. The rolled alloys were further annealed at temperatures ranging from 700 to 1200 °C. The CR- and WR(400)-processed materials showed fine lamellar structures. In contrast, the WR(600) material showed an equiaxed microstructure. The CR material showed a brass ({112}[removed])-dominated texture, corroborating the low stacking fault energy (SFE) of the MEA. In contrast, the WR(400) specimen showed a prominent α-fiber (ND//[removed]) but a noticeably weakened brass component. The WR(600) material also showed the presence of α-fibers due to recrystallization. The recrystallized CR and WR(400) materials showed decidedly larger grain sizes than the WR(600) material due to the differences in the grain boundary character distribution. The recrystallization textures showed α-fiber components, thus elucidating that the deformation texture components are preserved, as preferential nucleation, and preferential growth were not significant factors. The WR(400)-processed annealed specimen showed a significantly improved yield strength (~ 1120 MPa)-ductility (elongation ~ 19%) balance, establishing warm rolling as an attractive processing route. © 2021, ASM International.
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