COMPOSITION AND THERMODYNAMIC PROPERTIES OF THE SURFACE-LAYER OF BINARY MELTS OF MAGNESIUM WITH COPPER, TIN AND LEAD

The minimum possible surface layer thickness, layer composition, therm odynamic activities of components and Gibbs energy of solution formati on in the surface layer are determined in liquid alloys of the Cu-Mg, Mg-Sn and Mg-Pb systems. A monolayer model of the surface layer is typ ical of melts in the Mg-Sn and Mg-m, systems, a multilayer model is ty pical of melts in the Cu-Mg system. Solutions with negative deviations from the ideal behavior are formed in the surface layer and in the bu lk of the alloys studied.