Phase relationships in the Au-Co-Sn ternary system have been thermodynamically assessed by using the CALPHAD technique. The existing thermodynamic descriptions of the binary Au-Sn and Co-Sn systems were improved by incorporating the ab initio calculated enthalpies of formation of the intermetallic compounds including AuSn, CoSn, AuSn2, and AuSn4. For consistency, the Au-Co system was reassessed on the basis of the same pure element data as adopted for the Au-Sn and Co-Sn systems. With the combination of the three binary descriptions, the Au-Co-Sn ternary system was assessed by taking into account the ternary solubility in the binary compounds and the formation of a ternary compound. The obtained set of thermodynamic parameters can reproduce the measured phase equilibria at 380°C. The isothermal section at 396°C, the CoSn-Au and Au-SnCo vertical sections, and the liquidus projection were also calculated.
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Dong, H.Q., Jin, S., Zhang, L.G. et al. Thermodynamic Assessment of the Au-Co-Sn Ternary System. J. Electron. Mater. 38, 2158–2169 (2009). https://doi.org/10.1007/s11664-009-0874-4
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DOI: https://doi.org/10.1007/s11664-009-0874-4