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Supercooling during crystallization of a fusible component in Cu/(Bi–Sn) multilayer films

Using two independent in situ techniques, we have studied the supercooling during the Bi–Sn alloy crystallization in Cu/(Bi–Sn) films over the entire concentration range of the components. It has been determined that the relative supercooling value increases rapidly with the tin concentration increase, but starting from a concentration of 5 wt% Sn it acquires a value of about 0.23 melting point, which is maintained to a concentration of 80 wt% Sn. The constancy of the supercooling temperature observed in this concentration range indicates that the formation of a crystalline nucleus in a supercooled melt occurs without changing the composition of the alloy.