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Interdiffusion study of the topologically closed packed phase and the phase boundary compositions in the Fe-Mo system

Baheti, Varun A and Raju, Ravi (2019) Interdiffusion study of the topologically closed packed phase and the phase boundary compositions in the Fe-Mo system. In: INTERMETALLICS, 113 .

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Official URL: https://dx.doi.org/10.1016/j.intermet.2019.106586

Abstract

Fe/Mo bulk diffusion couples are annealed at 1050-1200 degrees C to study the growth and diffusion behaviour of mu phase in the Fe-Mo system. Parabolic growth constants and integrated interdiffusion coefficients are determined in the mu phase. The activation energies for the growth of mu phase and for the integrated interdiffusion coefficients are estimated as 228 +/- 22 and 733 +/- 10 kJ/mol, respectively. The relatively high activation energy for interdiffusion in mu phase, determined at high homologous temperature of 0.8-0.9, indicates that mu phase grows by lattice diffusion. Phase boundary compositions, measured by EPMA, indicates the homogeneity range of mu phase to be similar to 3 at.% higher towards the Fe-rich side (i.e., 36 at.% Mo) as compared to the reported composition of 39-44 at.% Mo in the phase diagram.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to ELSEVIER SCI LTD
Keywords: Intermetallics; Diffusion; Heat treatment; Joining (diffusion bonding); Electron microprobe; Scanning electron microscopy
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 28 Nov 2019 11:27
Last Modified: 28 Nov 2019 11:27
URI: http://eprints.iisc.ac.in/id/eprint/63841

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