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Growth of Phases and Diffusion of Components in the W-Pt System

Kiruthika, Perumalsamy and Paul, Aloke (2014) Growth of Phases and Diffusion of Components in the W-Pt System. In: JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, 35 (1). pp. 36-42.

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Official URL: http://dx.doi.org/10.1007/s11669-013-0274-6

Abstract

Growth kinetics, phase boundary compositions, interdiffusion coefficients and the relative mobilities of the components are determined in the W-Pt system. The measured phase boundary compositions for the gamma phase are found to be different from the reported phase diagram. The interdiffusion coefficient and the activation energy decrease in the Pt(W) solid solution with increasing W content. An estimation of the parabolic growth constants and average interdiffusion coefficients in the gamma phase indicates that the diffusion process should be explained based on the estimation of diffusion parameters, which otherwise could lead to a wrong conclusion. The estimation of the relative mobilities of the components in the gamma phase indicates that Pt has a much higher diffusion rate than W. This is explained with the help of the crystal structure and the possible point defects present on different sublattices.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the SPRINGER, 233 SPRING ST, NEW YORK,USA
Keywords: diffusion couples; diffusivity coefficient; interdiffusion; intermetallic compound
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Depositing User: Id for Latest eprints
Date Deposited: 11 Mar 2014 06:33
Last Modified: 11 Mar 2014 06:33
URI: http://eprints.iisc.ac.in/id/eprint/48549

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