The wetting behavior of molten Bi on polycrystalline Cu substrate and single crystal Cu substrate was studied bythe sessile drop method in the temperature range from 673 to 873 K. At low temperature the wetting behaviors ofmolten Bi on both types of Cu substrate were similar. However, at high temperature, the equilibrium contact angleof polycrystalline Cu substrate was lower than that of single crystal Cu substrate, because the preferred dissolutionof grain boundaries leads to a smaller liquid/solid interfacial energy for polycrystalline Cu substrate. The formationmechanism of arrow-shaped Cu grains at the Bi/single crystal Cu interface is also discussed.
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