Wetting of Polycrystalline alpha-Al_2O_3 by Molten Zr_(55)Cu_(30)Al_(10)Ni_5 Metallic Glass Alloy

摘要

The wetting behaviors of molten Zr_(55)Cu_(30)Al_(10)Ni_5 metallic glass alloy on polycrystalline alpha-A1_2O_3 substrates were investigated using a modified sessile drop method at 1133 to 1193 K in vacuum. Excellent wettability with final contact angles approaching zero degree and mild interfacial reaction were observed. The spreading followed a well-defined exponential decay law. It is the Zr adsorption at the interface and then formation of a Zr-Cu precursor film rather than the interfacial reaction that accounts for the excellent wettability in this system.