Contribution To Thermodynamic Description Of Al-Pd System

The homogeneity range around the Al3Pd stoichiometry, representing the family of quasicrystalline approximants denoted as epsilon(n) and/or (Al3Pd), was involved in the calculated Al-Pd phase diagram. The calculations were performed by means of the CALPHAD method using the Thermo-Calc software. A novel thermodynamic description of the epsilon(n)/(Al3Pd) phase was proposed based on the (Al%,Pd)(3)(Al,Pd%)(1) two-sublattice model. Existing thermodynamic parameters of stoichiometric phases Al4Pd and Al21Pd8 were slightly adjusted. The transition between phases epsilon(n)/(Al3Pd) and gamma-Al21Pd8 was predicted thermodynamically at 619 degrees C.