Abstract
The separating effects of Al from Ti-Al alloys were investigated via the molecular interaction volume model in vacuum distillation. The vapour-liquid equilibrium (VLE) composition and the activity coefficients of Ti-Al alloys at 1773 K–2273 K were predicted using only the properties of pure components. The calculated values of components activities are in good agreement with the corresponding FactSage data used for comparison. Predicted results of VLE show that the content of Ti in vapour and liquid phases increases with increasing distillation temperature. At 1873 K, in the vapour phase, the content of Ti was 0.000379 and 0.001353, while in the liquid phase it was 20 and 70 (all in wt %), respectively. The predicted separation coefficients indicate that Al can be separated from Ti completely by vacuum distillation. This study verified that FactSage Thermo-Chemical Software and Databases could serve as suitable source of experimental data for binary liquid alloys.
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