A coupled experimental and thermodynamic study of the Al-Cr and Al-Cr-Mg systems

Abstract The phase relation in the Al rich corner of the Al-Cr-Mg system was re-investigated at 400, 450, and 500 °C using diffusion couples, quenching experiments, and differential thermal analysis techniques. The homogeneity range of the Al 18 Cr 2 Mg 3 phase was determined to be Al-(8.7 ± 0.6) at.% Cr-(13.0 ± 2) at.% Mg. It was also confirmed that there is no ternary compound other than Al 18 Cr 2 Mg 3 in the Al-Al 7 Mg 3 -Cr system. A thermodynamic modeling for the binary Al-Cr and ternary Al-Cr-Mg systems was carried out based on the critically evaluated experimental data and new phase equilibria data from the present study.