Phase equilibria of the Cu-Zr-Ti ternary system at 703 °C and the thermodynamic assessment and metallic glass region prediction of the Cu- Zr-Ti ternary system

The Cu-Zr-Ti alloys are one of popular metallic glass systems due to their high glass-forming ability (GFA), lower cost, and good mechanical properties. The phase equilibria of the Cu-Zr-Ti ternary system are experimentally investigated first to reassess thermodynamic parameters. The isothermal section of the Cu-Zr-Ti ternary system at 703 degrees C is composed of 15 single phases including the ternary phase-Cu2TiZr, 17 two-phase regions, and 17 three-phase regions. The CuTi2-CuZr2 phases are formed as a continuous solid solution. The CuZr phase was not present in this ternary system. The calculation of phase diagram (CALPHAD) method can be used to predict the metallic-glass region. The suppressed intermetallic compounds, liquid miscibility gap, and spinodal curve were first combined to predict metallic-glass regions. The predicted region is in good agreement with the literature data and experimental results of the bulk-metallic-glass alloys applied in this study.

Automated summary

Cu-Zr-Ti alloys are popular metallic glass systems known for their high GFA, lower cost, and good mechanical properties. Experimental investigations of the phase equilibria revealed 15 single phases, including the ternary phase-Cu2TiZr, at 703 degrees C. The CALPHAD method successfully predicted the metallic-glass region based on suppressed intermetallic compounds, liquid miscibility gap, and spinodal curve.