Newtonian thermal analysis was carried out to investigate the solidification history and in-situ reaction of Al2O3/SiO2(p)/Al composites. The commercial pure Al was selected as the matrix. The SiO2 particles was incorporated into the molten Al by using stir casting method at about 750 ℃. The composites were produced at different wt.% (viz. 0, 3, 6 and 9) of SiO2. The microstructural constituents were analyzed by using a scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS). The phases in these composites were identified by X-ray diffraction (XRD). Compared with the cooling curve of pure Al sample, one more stage which related to the eutectic reaction of Al-Si was revealed in these curves of Al2O3/SiO2(p)/Al composites. The time duration of the eutectic stage in the cooling curve was prolonged with the increase of the SiO2 amount in molten Al. Solidification curves of different composite samples were given to illustrate the effect of SiO2 amount on the solidification property
