Thermodynamic modeling of Al-Fe-Cr ternary system

Abstract

The Al-Fe-Cr ternary system is one of the most important systems to developing aluminum alloys. Up to now, although several reviews about this ternary system have been available, however no thermodynamic assessment was published. In this paper, previous work of the Al-Fe-Cr ternary system and its related binary systems are reviewed. Then, Al-Cr binary system was re-assessed in order to better describe the phases Al8(Cr, Fe)5 in ternary system. Based on the re-assessed Al-Cr binary system and Al-Fe, Fe-Cr binary systems assessed before, as well as the experimental data reported in the literature, the Al-Fe-Cr ternary system was assessed by means of CALPHAD method. Isothermal sections of 1433, 1348, 1273, 1173, 1073 and 973 K in Al-rich corner and some invariant reactions are calculated. It is shown that the present calculations are in good agreement with the most of the experimental results.