In order to understand the interaction of lead-free Ag-In-Sn solders with palladium substrates one has to know the quaternary Ag-In-Pd-Sn phase diagram, and for that all the constituent binaries and ternaries. For this purpose, enthalpies of mixing were determined calorimetrically for liquid ternary Ag-Pd-Sn and In-Pd-Sn and quaternary Ag-In-Pd-Sn alloys. These experimental results were taken into account as an input for the optimization in CALPHAD - type phase diagram calculations of the above-mentioned two ternary phase diagrams. These were then combined with an earlier optimization of the Ag-In-Pd system as well as with literature data on the Ag-In-Sn system to obtain a first idea of the phase diagram of the quaternary Ag-In-Pd-Sn alloy system. The calculations were supported by a number of specifically devised experiments.

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