The solidification path of Al-Cu-Si alloys in the Al-rich corner are investigated. The thermodynamic data needed in the calculation are obtained by direct coupling with the CALPHAD software Thermo-Calc. A paralell experimental investigation is conducted to validate the prediction results. The calculated results show that, the sensitivity of the variations in the solidification paths to the cooling rates are depended on the distance of the initial compositions from the binary eutectic troughs or the ternary eutectic point. Reasonable agreements are observed between the predicted amounts of θ-phase and the measured results.
