Interaction of components of glass-forming melts of iron and nickel with titanium, zirconium and hafnium
1 Mixing enthalpies of liquid alloys

Abstract

The mixing enthalpies of liquid glass-forming Fe–Ni–Ti, Fe–Ni–Zr, and Fe–Ni–Hf alloys were examined at 1873 K by high-temperature calorimetry. The thermodynamic properties of melts in the Fe–Ni–Hf system were studied for the first time. Along the studied sections (x_Fe/x_Ni = 0.50/0.50 at x_Ti = 0–0.15, x_Fe/x_Ni = 0.50/0.50 at x_Zr = 0–0.45, x_Fe/x_Ni = 0.75/0.25 at x_Hf = 0–0.18, x_Fe/x_Ni = 0.50/0.50 at x_Hf = 0–0.45, and x_Fe/x_Ni = 0.25/0.75 at x_Hf = 0–0.46), the partial mixing enthalpies of IVB metals and the integral mixing enthalpy showed negative values. New experimental data on the integral mixing enthalpy of the liquid alloys were combined with the literature data, and the Δ_mH isotherms of the liquid ternary Fe–Ni–Ti, Fe–Ni–Zr, and Fe–Ni–Hf alloys at 1873 K were plotted using the Redlich–Kister–Muggianu equation. The Δ_mН function was negative in each of the studied systems, being indicative of strong interparticle interaction of the components in the glass-forming liquid alloys. The composition dependence of the integral mixing enthalpy of the liquid alloys and its change in the series of the systems can be qualitatively interpreted in terms of the electronegativity of the chemical elements in the liquid alloys.