Abstract
Spreading of a molten metal system on an intermetallic surface with anisotropic microstructured surface topography was studied with hot-stage microscopy and an elliptical spreading pattern was noticed. Surface characterization indicates that the spreading is preferential, aligned to the direction associated with the grain orientation of the intermetallic surface. A theoretical model was established to analyze such preferential spreading phenomenon: the main stage of the spreading kinetics agrees well with the x∼t1/2 relation obtained by the theoretical model; for the subsequent time segment of the phenomenon evolution, a x∼t1/n (n≈5) relation was established. This study shows that the direction of spreading of molten metal flow can be controlled by surface topography modification. The kinetics of the main stage of the spreading can be described well with the proposed model.
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