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

Published online by Cambridge University Press:  11 August 2011

Vadegadde Duggappa Divya ,
Upadrasta Ramamurty  and
Aloke Paul
Vadegadde Duggappa Divya
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Upadrasta Ramamurty
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Aloke Paul*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
*
a)Address all correspondence to this author. e-mail: aloke@materials.iisc.ernet.in
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Abstract

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.

Keywords

Diffusion

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Type
Articles
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Journal of Materials Research , Volume 26 , Issue 18 , 28 September 2011 , pp. 2384 - 2393
Copyright
Copyright © Materials Research Society 2011

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