Clarification of Peritectic Reaction Between Diffusion and Heat Transfer Mechanisms in Sn-Ni Alloy Through Confocal Laser Scanning Microscopy

The nucleation and intermittent growth of peritectic Ni 3 Sn 4 phase along the liquid/primary Ni 3 Sn 2 interface were observed through high-temperature confocal laser scanning microscope (HT-CLSM) in Sn-Ni system where both solid phases are intermetallics. The intermittent growth of Ni 3 Sn 4 phase was confirmed to be representative of heat transfer mechanism of peritectic reaction. The comparison between the measurement and theoretical prediction demonstrates that the heat transfer mechanism should play a much more important role in this alloy. Graphical abstract