Influence of structural relaxation on wetting behavior of molten In-Sn alloy on Cu40Zr44Al8Ag8 bulk metallic glass

Influence of structural relaxation on wetting behavior of molten In-Sn alloy on Cu40Zr44Al8Ag8 bulk metallic glass (BMG) was studied using the sessile-drop method at isothermal condition in high vacuum. It was found that the equilibrium contact angle increased with the increase of the pre-annealing temperature of Cu40Zr44Al8Ag8 BMG substrate. Moreover, the high-temperature structural relaxation greatly affected wetting behavior of molten In-Sn alloy on Cu40Zr44Al8Ag8 BMG substrate. By analyses of interfacial microstructure, the interface between In-Sn alloy and pre-annealed Cu40Zr44Al8Ag8 BMG was continuous, while no interfacial reaction layer formed in the temperature range studied.