Abstract
Substantial undercooling up to 550 K (0.386 T E, with T E as the melting point) was achieved in eutectic Ni 78.6Si 21.4 alloy melt using glass fluxing combined with cyclic superheating. Accordingly, a particular refined microcrystalline morphology is obtained in the as-solidified structure. The physical mechanism of the grain refinement subjected to high undercooling is interpreted in terms of the classical nucleation theory and LKT/BCT model. It was concluded that the above refinement can be ascribed to the substantially increased nucleation rate under high undercooling.
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