MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Prediction of Intermetallic Compound Formation Sequences in Pseudo Binary Diffusion Couples: Experimental Examinations for (Sn-xZn)/Cu (x = 2, 5, 10, 15, 20 and 25 mass%) by a Kinetic Model with Thermodynamic Data Using MDR Diagram
Shinichi TerashimaTsutomu Sasaki
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2014 Volume 55 Issue 11 Pages 1750-1754

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Abstract

A kinetic model based on the principle of maximum degradation rate of the total system free energy, MDR law, using thermodynamic data is applied to (Sn-Zn)/Cu diffusion couples to predict intermetallic compound phases and their order to be formed. According to this model, only γ-Cu5Zn8 is predicted to appear when Zn content is less than 10 mass%, while both γ-Cu5Zn8 and ε-CuZn4 can exist with 10 mass%Zn or more, which was in a good agreement with EPMA and TEM observations of Cu plates dipped into Sn-Zn baths. Therefore, it is concluded that the phase prediction based on the MDR law can also be applied to pseudo binary diffusion systems.

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© 2014 The Japan Institute of Metals and Materials
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