Abdulov O. Thermodynamic properties of Cu-Ti-Zr, Cu-Ni-Ti, Cu-Fe-Ti liquid alloys and modeling of their glass-forming ability

The mixing enthalpies of liquid Cu-Ti-Zr, Cu-Ni-Ti, Cu-Fe-Ti and Fe-Ti alloys were studied at 1873 K using the high-temperature isoperibolic calorimeter. The partial mixing enthalpies of the components of the ternary systems and addition of metals with them were studied for the first time, and it was found that the partial enthalpies have exothermal character. The thermodynamic mixing functions of binary and ternary liquid alloys were modeled using the ideal associated solution model in wide composition ranges. The analysis of the short-range order in the investigated melts carried out in the framework of the ideal associated solution model, and the application of the determined empirical criteria allow to evaluate the concentration range of amorphization of melt-spun alloys. The thermodynamic assessment of the Cu-Ti-Zr system and the description of the boundary Cu-Ti and Ti-Zr systems taking into account the latest experimental data on the phase equilibria and the thermodynamic properties of the meltsof the relevant systems have been carried out in the spirit of the CALPHAD-approach. Obtained thermodynamic models of Cu-Ti-Zr phases system have been used to calculate the metastable phase transformations including the supercooled liquid.