Enthalpies of Formation in the Al-Ni-Fe System by Direct Reaction Synthesis Calorimetry

摘要

The enthalpies of formation of ternary compounds in the Al-Ni-Fe system have been determined by high temperature reaction calorimetry. The enthalpy values measured are compared to previously published results where available as well as extended Miedema model and Thermocalc predictions. The composition dependence of the enthalpy of formation and lattice parameter of the B2 phase were determined in the region of Al ≤ 0.5 mole fraction and correlated with the defect structure. The results have been analyzed using a Wagner-Schottky model and the values of the parameters in the model determined.