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Solid-state diffusion-controlled growth of the phases in the Au-Sn system

Baheti, Varun A and Kashyap, Sanjay and Kumar, Praveen and Chattopadhyay, Kamanio and Paul, Aloke (2018) Solid-state diffusion-controlled growth of the phases in the Au-Sn system. In: PHILOSOPHICAL MAGAZINE, 98 (1, A). pp. 20-36.

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Official URL: http://dx.doi.org/10.1080/14786435.2017.1392052

Abstract

The solid state diffusion-controlled growth of the phases is studied for the Au-Sn system in the range of room temperature to 200 degrees C using bulk and electroplated diffusion couples. The number of product phases in the interdiffusion zone decreases with the decrease in annealing temperature. These phases grow with significantly high rates even at the room temperature. The growth rate of the AuSn4 phase is observed to be higher in the case of electroplated diffusion couple because of the relatively small grains and hence high contribution of the grain boundary diffusion when compared to the bulk diffusion couple. The diffraction pattern analysis indicates the same equilibrium crystal structure of the phases in these two types of diffusion couples. The analysis in the AuSn4 phase relating the estimated tracer diffusion coefficients with grain size, crystal structure, the homologous temperature of experiments and the concept of the sublattice diffusion mechanism in the intermetallic compounds indicate that Au diffuses mainly via the grain boundaries, whereas Sn diffuses via both the grain boundaries and the lattice.

Item Type: Journal Article
Additional Information: Copy right for the article belong to TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 13 Apr 2018 19:58
Last Modified: 13 Apr 2018 19:58
URI: http://eprints.iisc.ac.in/id/eprint/59544

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