Thermodynamic assessment of the Al-Fe-Si system

The phase equilibria and thermodynamic properties of the ternary Al-Fe-Si s ystem were analyzed and a complete thermodynamic description of the ternary system was obtained. The thermodynamic descriptions of the three binary sy stems were taken from the literature. Most of the binary intermetallic phas es, except Al13Fe4(theta), FeSi2-L, and FeSi2-H, were assumed to have no te rnary solubility. Based on the experimental data, seven stable ternary inte rmetallic phases were considered in the system. Two of them were treated as semistoichiometric compounds with homogeneity range for Al and Si, and the others were treated as stoichiometric compounds. Reasonable agreement was obtained between calculation results and experimental information in the te rnary system.