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Elemental Sub-Lattice Occupation and Microstructural Evolution in γ / γ � Co-12Ti-4Mo-Cr Alloys

Im, HJ and Makineni, SK and Oh, CS and Gault, B and Choi, P-P (2021) Elemental Sub-Lattice Occupation and Microstructural Evolution in γ / γ � Co-12Ti-4Mo-Cr Alloys. In: Microscopy and Microanalysis .

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Official URL: https://doi.org/10.1017/S1431927621000362


We report on comparative atom probe tomography investigations of γ/γ�-forming Co-12Ti-4Mo-Cr alloys. Moderate additions of Cr (2 and 4 at) reduced the γ/γ� lattice misfit and increased the γ� volume fraction of a Co-12Ti-4Mo alloy significantly. These microstructural changes were accompanied by changes in the elemental partitioning between γ and γ� and site-occupancy in γ�. Spatial distribution maps revealed that Mo occupied both Co and Ti sub-lattice sites in γ�. In agreement with the experimental data, thermodynamic calculations predicted a stronger tendency for Mo to occupy the Co-sites than for Cr and an increase in Cr fraction on the Ti-sites with increasing Cr content. Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of the Microscopy Society of America.

Item Type: Journal Article
Publication: Microscopy and Microanalysis
Publisher: Cambridge University Press
Additional Information: The copyright for this article belongs to Cambridge University Press
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 06 Aug 2021 10:33
Last Modified: 06 Aug 2021 10:33
URI: http://eprints.iisc.ac.in/id/eprint/69146

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