Effects of pouring temperature

rare earth （Pr） modification on the microstructure and properties of as-cast Mg2Si particle reinforced hypereutectic Al-Si alloy in-situ composites prepared by liquid-melting casting were examined. The results show that the composites with uniform and fine grain size can be prepared by pouring at 720 ℃ nearby liquidus temperature. RE modifier can effectively refine the primary Si phase and eutectic structure while refine size and change morphology of the Mg2Si particle

obviously improving the mechanical properties of the alloy and postponing the modification time.