INTERACTION OF COMPONENTS IN Cu–Fe GLASS-FORMING MELTS WITH TITANIUM, ZIRCONIUM, AND HAFNIUM.
I. CALORIMETRIC STUDY OF MIXING ENTHALPIES

Abstract

The partial mixing enthalpies of titanium, zirconium, and hafnium with liquid copper and iron alloys were studied by high-temperature calorimetry. The studies were carried out at a temperature of 1873 K along the sections with constant ratio x_Cu/x_Fe = 3, 1, and 1/3. Along all the studied sections, these functions are negative. The integral mixing enthalpies of components in the Cu–Fe–(Ti, Zr, Hf) systems along the studied sections were calculated by integrating the Gibbs–Duhem equation. The ΔН functions for ternary Cu–Fe–(Ti, Zr, Hf) melts are characterized by positive values in the vicinity of the binary Cu–Fe system and show negative values in a range of compositions with x_Me > 0.1 (Me = Ti, Zr, Hf).