Abstract
The gold-rich side of the AuSn system has been examined using differential thermal analysis, differential scanning calorimetry and electron probe microanalysis. The presence of three intermetallic phases, β, ζ and ζ ′, between gold and AuSn has been verified, although the composition ranges reported here are significantly different from those of previous studies. The resulting proposed AuSn phase diagram contains six intermetallic compounds and seven invariant reactions. Within the gold-rich region of the diagram there are four invariant reactions that occur: peritectics at 532 and 521 °C, a eutectic at 280 °C and a peritectoid at 190 °C, below which ζ ′ is stable. The solubility range of tin in the ζ phase at 280 °C is 9.5–17.6 at. % Sn and in the β phase is 8.25–9.11 at.% Sn at the same temperature.
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