Wetting behavior and interfacial characteristics of In–Sn alloy on CuZr-based bulk metallic glass

The wettabilities of In–Sn alloy on Cu40Zr44Al8Ag8 BMG substrate were investigated using the sessile-drop method at different temperature. The result shows that the equilibrium contact angle decreased with increasing temperature. The interfacial reaction of the active Sn atoms in molten In–Sn alloy and the active Zr atoms in Cu40Zr44Al8Ag8 BMG caused crystallization reaction. Ion beam sputtering profiling in combination with AES technique was employed to investigate the Sn diffusion in Cu40Zr44Al8Ag8 BMG. Between 473 K and 673 K, the diffusion coefficients vary from 0.7 × 10−16 m2/s to 12.9 × 10−16 m2/s. It is concluded that the interfacial reaction is favorable to the crystallization and then the crystallization also promotes Sn diffusion.