Formation mechanism of anomalous eutectics in highly undercooled Ag--39.9 at%Cu alloy

This paper investigates the solidification behaviour of the Ag--Cueutectic alloy melt undercooled up to 100K. It is revealed thatlamellar eutectics grow in a dendritic form in the Ag--Cu eutecticmelt with undercooling equal to or greater than 76K. Asundercooling increases, the remelted fraction of the primaryeutectics during recalescence rises. The severe remelting and thesubsequent ripening of the primary eutectic dendrites lead to theformation of anomalous eutectics.