Abstract
The mixing enthalpies of Al–Pr binary liquid alloys are measured in the ranges 0 < x Pr < 0.15 at 1560 K and 0.46 < x Pr < 1 at 1410–1670 K by isoperibol calorimetry. The Al–Pr binary melts are characterized by significant negative mixing enthalpies: $$ \varDelta {H}_{Al- \Pr}^{{}^{min}} $$ = –43.1 kJ/mol at x Pr = 0.33 (at 1500 K, extrapolation onto the range of supercooled melts). The activities of components, entropies, Gibbs energies, and liquidus curve of the Al–Pr phase diagram are evaluated using the model of ideal associated solutions.
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