Thermodynamic analysis of Al-Sc, Cu-Sc and Al-Cu-Sc system

Encouraged by the promising application of the Al-Cu-Sc system in the development of high strength aluminum alloy, the Al-rich region of this system was assessed by the CALPHAD approach. In order to make the models used for the phases in the three binary sub-systems compatible with each other, Al-Sc and Cu-Sc system were remodeled. Substitutional solution model was used for solution phases and sublattice model for binary intermetallic phases and the ternary compound Al8-xCu4+xSc. Comparisons between the calculated and experimental results showed that most of the experimental information was satisfactorily described by the present thermodynamic description. (C) 2009 Elsevier B.V. All rights reserved.