Thermodynamic Properties of Binary Al–Ce and Ce–Fe Alloys

Abstract

The mixing enthalpies of liquid alloys in the binary systems Al–Ce (at 1540 K in the composition range 0.7 < x Ce < 1) and Ce–Fe (at 1830 K in the entire composition range) are determined by calorimetry. The thermodynamic properties of liquid alloys are calculated in the entire composition range using the model of ideal associated solutions. The thermodynamic activities of components show large negative deviations from the ideal solution for the Al–Ce melts and small ones for the Ce–Fe melts. The mixing enthalpies correspond to exothermic effects. The minimum values of the mixing enthalpies of liquid alloys are −45.8 ± 2.2 kJ/mol at x Ce = 0.37 for the Al–Ce system (1870 K) and −1.0 kJ/mol at x Ce = 0.36 for the Ce–Fe system (1830 K).