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Thermodynamic assessment of phase equilibria in the Sn-Au-Bi system with key experimental verification

Published online by Cambridge University Press:  31 January 2011

Xingjun Liu
Affiliation:
Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, People's Republic of China; and Research Center of Materials Design and Applications, Xiamen University, Xiamen 361005, People's Republic of China
Kiyohito Ishida
Affiliation:
Department of Materials Science, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
Corresponding
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Abstract

The phase equilibria at 200 °C, 250 °C, 300 °C, and 400 °C and the phase transformation of the Sn-Au-Bi system were investigated by using the electron probe micro-analyzer (EPMA) and differential scanning calorimeter (DSC), respectively. It is found that there is a new ternary intermetallic compound with a possible AuSn structure (called the ϕ phase in the present work), which has a limited solubility of Au in the Au-rich portion, and the ϕ phase decomposes peritectically at about 313 °C. Based on the experimental data reported in the previous papers and new experimental data determined by the present work, thermodynamic assessments of the Sn-Au-Bi system were carried out by the calculation of phase diagrams (CALPHAD) method. The thermodynamic parameters for describing the Gibbs free energy of each phase were optimized, and reasonable agreement between the calculated results and experimental data was obtained in the Sn-Au-Bi ternary system.

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Copyright © Materials Research Society 2010

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