Thermodynamics of Titanium and Boron in Molten Aluminum

Solubilities of Al3Ti at 1273-1623 K and TiB2 at 1373-1573 K in molten Al were measured, and the excess partial molar Gibbs energies of titanium and boron in molten Al of liquid standard state at infinite dilution were determined as follows.GeTxi*(l) = RT ln γ°Ti(l) = 95800(±790)+24.5(±0.70)T (J/mol) [943∼1623 K]GeBx*(l) = RT ln γ°B(l) = 18600(±1100) (J/mol) [1373∼1573 K]Also, solubility of AlB12 at 1273-1573 K in molten aluminum was measured, and the standard formation energy of AlB12 was evaluated as a following equation with the determined thermodynamic property of boron in molten aluminum.