Microstructural evolution and effect of heat treatment on the precipitation and mechanical behavior of Al0.7CoCrFeNi alloy

John, Rahul and Malladi, Sairam K and Murty, B S and et al, . (2022) Microstructural evolution and effect of heat treatment on the precipitation and mechanical behavior of Al0.7CoCrFeNi alloy. Journal of Alloys and Compounds, 904. pp. 1-12. ISSN 0925-8388

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The microstructural features and promising properties exhibited by Al0.7CoCrFeNi have led to extensive studies on the alloy. The current work discusses the microstructural evolution, thermal stability and mechanical behavior of the alloy. CALPHAD studies predicated the alloy to be near eutectic with pro-eutectic BCC and eutectic FCC and BCC/B2. However, experimental studies displayed the FCC phase to evolve from a high-temperature B2. Interfacial energy, chemical inhomogeneity and cooling rate were attributed to play a key role in the microstructural evolution and phase stability. Heat treatment resulted in the dissolution of BCC and the formation of Al-Ni-rich B2 phase. During solidification and heat treatment, Widmanstätten FCC formed and coarsened via superledge mechanism. Further, thermal exposure resulted in lamellar instability and localized globularization of the B2 phase. The heat-treated alloy displayed excellent resistance to thermal softening when compared to the cast alloy. Further, the thermally exposed alloy exhibited a superior work hardening rate. © 2022

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IITH Creators:
IITH CreatorsORCiD
Malladi, Sairam Khttps://orcid.org/0000-0002-0322-8137
Murty, B Shttps://orcid.org/0000-0002-4399-8531
Item Type: Article
Uncontrolled Keywords: Globularization; Heat treatment; High entropy alloys; Lamellar instability; Mechanical behavior; Superledge mechanism
Subjects: Others > Metallurgy Metallurgical Engineering
Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 27 Jun 2022 07:48
Last Modified: 27 Jul 2022 05:55
URI: http://raiith.iith.ac.in/id/eprint/9408
Publisher URL: http://doi.org/10.1016/j.jallcom.2022.164105
OA policy: https://v2.sherpa.ac.uk/id/publication/13772
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