Thermodynamic assessment of the Mg-Pb and Mg-Bi systems using substitutional solution and associate models for the liquid phase

Abstract

A bstractB y means o f CALPHAD approach, thermodynamic assessments o f the Mg-Pb and M g-Bi systems were carried out based on the available experimental data including thermodynamic properties and phase equilibrium data. The liquid phase was described with both the substitutional solution model and the associate model, and two sets o f self-consistent thermodynamic param eters fo r the Mg-Pb and M g-Bi systems were obtained, respectively. It was fo u n d that the associate m odel can account fo r the experimental data more satisfactorily than the substitutional solution one, especially fo r the liquid phase with the short-range order behavior.

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