Microstructure and texture of CoCrNi medium entropy alloy (MEA) processed by severe cryo-rolling: A study vis-a-vis cold-rolling

Saha, J. and Saha, R. and Malladi, Sai Rama Krishna and Bhattacharjee, Pinaki Prasad (2021) Microstructure and texture of CoCrNi medium entropy alloy (MEA) processed by severe cryo-rolling: A study vis-a-vis cold-rolling. Intermetallics, 138. pp. 1-10. ISSN 0966-9795

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Abstract

The microstructure and texture of severely cryo-rolled and annealed CoCrNi equiatomic medium entropy alloy (MEA) were investigated in the present work. To highlight the impact of cryo-rolling, these aspects were critically compared with similarly cold-rolled and annealed MEA. The alloy was cryo- and cold-rolled to 90% reduction and annealed at temperatures ranging from 700 °C to 1200 °C. Formation of deformation-induced nanostructure was observed in both materials. However, the slightly higher hardness of the cryo-rolled material was indicative of finer nanostructure and higher defect density as compared to those in the cold-rolled material. The cold-rolled material showed a perceptibly stronger brass texture than the cryo-rolled alloy. Extreme grain refinement and high density of intersecting shear bands appeared to weaken the brass texture in the cryo-rolled material. The lower grain size in the cryo-rolled material after different annealing treatments was consistent with a greater density of potential nucleation sites. The annealing texture of both cryo- and cold-rolled materials showed the presence of weak α-fiber (ND//[removed]) components. Annealing resulted in a pronounced decrease in hardness, although sufficiently high hardness could still be obtained at a lower annealing temperature regime. Moreover, the hardness results were represented in a Hall-Petch plot which revealed a very high lattice friction stress for the MEA. © 2021 Elsevier Ltd

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IITH Creators:

IITH Creators	ORCiD
Malladi, Sai Rama Krishna	https://orcid.org/0000-0002-0322-8137
Bhattacharjee, Pinaki Prasad	http://orcid.org/0000-0002-6422-2601

Item Type:

Article

Additional Information:

The financial supports of DST-SERB, India (EMR/2016/002215, ECR/2017/002628, CRG/2020/00665), the DST-FIST program (SR/FST/ETI-421/2016), and the DRDO (ER&IPR) (ERIP/ER/2002002/M/01/1773) are sincerely acknowledged.

Uncontrolled Keywords:

Annealing; Cryo-rolling; Medium entropy alloys; Microstructure; Texture

Subjects:

Materials Engineering > Materials engineering

Divisions:

Department of Material Science Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

06 Sep 2022 09:20

Last Modified:

06 Sep 2022 09:20