Abstract
The wetting behavior and interfacial microstructures of molten Sn on the amorphous and annealing‐induced nanocrystalline Ni75B15Si10 ribbons were investigated using a modified sessile‐drop method. The results show that the amorphous structure favors the wettability, while the structural relaxation and primary crystallization remarkably deteriorate it. The wetting is essentially attributed to the strong chemical affinity between liquid Sn and Ni in the substrate. Precipitation of the nanocrystallites like Ni3B and Ni3Si weakens the wettability by decreasing the atomic activity of Ni. However, the reduced oxidation of the substrate surface after higher temperature annealing and the alleviated diffusion of Sn towards the bulk of the substrate as well as possible capillarity assistance of the liquid movement along the grain or phase boundaries ahead of the triple line may help to facilitate the wetting to some extent. Copyright © 2012 John Wiley & Sons, Ltd.
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