Estimation of the functions of some iron-based ternary systems within Miedema model and comparison with experiment

Abstract

The Miedema model is used to estimate the enthalpy of intermetallic compounds and the solid solution of ternary systems. The results showed that the chemical enthalpy values of the binary systems (Fe-Al, Fe-B, Fe-V, Fe-Ga, Al-V, and Al-Mn) are negative. Whereas, the chemical enthalpy values of the binary systems (Fe-Mn and Al-Ga) are positive. The most negative enthalpy is observed for Fe-Al-Ga, Fe-Al-B, and Fe-Al-Sn systems with a mole fraction of 50% of Fe. For ternary systems, the enthalpy varies with the mole fractions of the components. Studies of the products of mechanosynthesis - binary alloy and Fe-Al-based ternary systems: Fe65Al35, Fe65Al35-xMx (Mx = Ga, B, Sn; 5 and 10 at. %) and Fe65-yAl35My (My = Mn, V; 3, 5 and 10 at. %) were confirmed. It concluded that the applicability of the Miedema model for prognostic purposes for estimating the enthalpies and the possibility of obtaining multicomponent systems.

Keywords

• Miedema’s model
• Enthalpy
• CALPHAD
• Alloying