Phase Transformation Temperatures, γ–γ′ Lattice Parameter Misfit, and γ′ Precipitate Morphology in Co–Ti–V Alloys

Verma, SK and Pramanik, A and Jyothsna, K and Vamsi, KV and Karthikeyan, S (2022) Phase Transformation Temperatures, γ–γ′ Lattice Parameter Misfit, and γ′ Precipitate Morphology in Co–Ti–V Alloys. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science .

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Abstract

In the context of developing tungsten free cobalt alloys, the physical metallurgical properties of γ′ precipitate strengthened Co–Ti–V alloys were investigated. In this study, few alloys were cast and heat treated to study systematic effects on the properties. The addition of V to the Co–Ti system decreases γ′ solvus temperature, whereas it increases solidus temperature. The γ–γ′ lattice parameter misfit decreases with V addition. The γ′ precipitates have cuboidal with round corners morphology, and the extent of roundedness of corners increases with V addition. Density functional theory calculations were performed to understand the experimental observation of phase transformation temperatures, lattice misfit, and γ′ precipitate morphology. The calculations indicate that magnitude of the heat of formation of Co3(Ti,V) in the L12 crystal structure decreases with V addition. The γ–γ′ interfacial energy at 0 K is predicted to increase with V addition to the Co–Ti system.

Item Type:	Journal Article
Publication:	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Publisher:	Springer
Additional Information:	The copyright for this article belongs to the Springer.
Keywords:	Cobalt alloys; Density functional theory; Lattice theory; Morphology; Phase transitions; Tungsten alloys, Density-functional theory calculations; Lattice misfits; Metallurgical properties; Phase transformation temperature; Solidus temperature; Systematic effects; γ' precipitates; γ'precipitate morphology; γ'solvus temperature, Lattice constants
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	06 Oct 2022 11:09
Last Modified:	06 Oct 2022 11:09
URI:	https://eprints.iisc.ac.in/id/eprint/77256

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