TiB2 particle reinforced aluminum matrix composites were synthesized by in-situ reaction

and the formation mechanism of reinforcement in the composites was analyzed by XRD（X-ray diffraction）

and three key factors influencing solidification process were analyzed by measuring solidified dynamic curves of the composites

meanwhile

tensile behavior of the composites was observed by the SEM（scanning electron microscope）.The chemical reactive formula is described as 3TiO2 +10Al+3B2O3→5Al2O3 +3TiB2 with molar ratio of 1 of TiO2 via B2O3.The solidification process is mainly controlled by distribution of particles in the matrix

molar ratio of TiO2 via B2O3 and reactive temperature.The strengthening mechanism is characterized by dispersed enhancing from TiB2 particle and fine-grain enhancing resulting form TiB2 as nuclei substrate.Fracture mechanism of the composites is characterized by micro-hole concentrating toughening failure from TiB2 particle pulled out.