Thermodynamic assessment of the Al–Pd system

The Al–Pd binary system has been thermodynamically assessed by means of the computer program Thermo-Calc. The Redlich–Kister polynomial was used to describe the solution phases, liquid (L) and fcc. The sublattice-compound energy model was employed to describe the intermetallic compounds with homogeneity ranges, (AlPd), (AlPd2), (Al3Pd2) and (Al2Pd5). The intermetallic compounds with no homogeneity ranges, Al3Pd, Al21Pd8, Al4Pd and Al3Pd5, were treated as stoichiometric phases. The parameters of the Gibbs energy expressions were optimized according to all the available experimental information on both the equilibrium data and the thermodynamic results. A set of self-consistent thermodynamic parameters of the Al–Pd system has been obtained. The calculations agree well with the respective experimental data.