MODELING NONSTOICHIOMETRIC PHASES IN THE SYSTEM AL-CU-MG-ZN

Thermodynamic databases for multicomponent systems are proving to be o f great importance as a tool in materials design. Considerable effort is therefore being directed to the provision of more physically based and hence more reliable thermodynamic modelling of the different phase s concerned. In this work a method illustrating the modelling of the n on-stoichiometric T and Laves phases in the Al-Cu-Mg-Zn system is pres ented briefly, whereby the minimal information available is used to pr ovide only a small number of parameters for formulation of the Gibbs e nergy of the phases.