Interfacial Tension between Solid Cu and Liquid Cu-Bi and Cu-Pb Alloys

Abstract

The interfacial tension between a liquid Cu-Bi or Cu-Pb alloy and solid Cu was measured by using multiphase equilibria. The results are summarized as follows:
(1) The surface tension of solid Cu coexisting with the liquid Cu-Bi or Cu-Pb alloy is significantly lower than that of pure solid Cu, becase Bi or Pb vapor atoms are adsorbed on the surface.
(2) The measured interfacial tension, γ_SL, between the liquid Cu-Bi or Cu-Pb alloy and solid Cu is in fairly good agreement with that calculted by the Good and Girifalco’s equation (γ_SL=γ_SV+γ_LV−2Φ_G(γ_SVγ_LV)^1⁄2), in which the parameter, Φ_G, is assumed to be 0.947.