Convective Flow and Its Effect on the Liquid-liquid Phase Transformation of Monotectic Alloys

A two-phase convective flow model is presented. The model describing the microstructure evolution during the liquid-liquid phase transformation is developed by taking into account of the convective effect. Calculations are carried out for Al-Pb alloy. The effect of the convection on the microstructure formation during the liquid-liquid phase transformation is investigated. The results indicate that the convection changes the nucleation behavior of the minority phase droplets, enhances the maximums of the number density, the radius and the volume fraction of the droplets in front of the solidification interface. It promotes the formation of the solidification microstructure with a serious macrosegregation.