APPLICATION OF THE LCPT MODEL TO SOLID-LIQUID EQUILIBRIA FOR BINARY COMPOUND-FORMING ALLOYS

The linear chemical-physical theory (LCPT) model for liquid metal solu tion thermodynamics has been extended to the determination of the liqu idus curves for binary intermetallic compound-forming systems. The equ ations developed include corrections to the observed melting point tem perature and heat of fusion for compounds that dissociate partially on melting. The primary advantages of the LCPT model for solid-liquid eq uilibria are the small number of physically realistic parameters requi red, ease of implementation, and wide applicability. In addition, the model also permits the incorporation of compounds in modeling the liqu idus curves that are not necessary for representing the liquid-phase t hermodynamic properties. For the seven systems studied, the agreement between calculated and experimentally measured liquidus curves is quit e good.