Abstract
The complex features of the Al–Sn–Cu phase diagram, dominated by ternary liquid demixing, are revealed by a combination of thermodynamic modeling and experimental studies. Nine ternary alloys were selected to cover all essential features involving the liquidus surface and the invariant solidification reactions. These were analyzed by differential thermal analysis as well as microstructural and local chemical analysis of solidified microstructures. Three different monotectic invariant reactions occur in this system. Small changes in alloy composition may produce distinctly different microstructures with primary crystallization and secondary demixing or vice versa.
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