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Interdiffusion and the vacancy wind effect in Ni-Pt and Co-Pt systems

Divya, VD and Ramamurty, Upadrasta and Paula, Aloke (2011) Interdiffusion and the vacancy wind effect in Ni-Pt and Co-Pt systems. In: Journal of Materials Research, 26 (18). pp. 2384-2393.

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In this study, bulk and multifoil diffusion couple experiments were conducted to examine the interdiffusion process in Ni-Pt and Co-Pt binary alloy systems. Inter-, intrinsic-, and tracer-diffusion coefficients at different temperatures, and as a function of the composition, were estimated by using the experimental data. Results show that in both the alloy systems, Pt is the slower diffusing species, and hence the interdiffusion process is controlled by either Ni or Co. The thermodynamic driving force makes the intrinsic diffusion coefficients of Co and Ni higher in the range of 30-70 at.%. The low activation energy for Co and Ni impurity diffusion in Pt compared with Pt in Ni and Co indicates that the size of the atoms plays an important role. The vacancy wind effects on the diffusion process are examined in detail, and it was demonstrated that its contribution falls within the experimental scatter and hence can be neglected.

Item Type: Journal Article
Publication: Journal of Materials Research
Publisher: Cambridge University Press
Additional Information: Copyright of this article belongs to Cambridge University Press.
Keywords: Diffusion
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 17 Nov 2011 09:30
Last Modified: 05 Mar 2019 11:19
URI: http://eprints.iisc.ac.in/id/eprint/42091

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