Abstract:The in-situ Al₂O_3p-TiC_p/Al composite was fabricated by XD (exothermic dispersion) process in TiO₂-Al-C system, and the effect of carbon  content on the microstructure of the fabricated composite and the reactive temperature characteristics had been studied. The results show that carbon content affects the microstructure and reactive temperature of Al₂O_3p-TiC_p/Al composite greatly. The quantity of TiC phases in the fabricated composites increases, while the Al₃Ti phases reduces with increasing carbon content. And when C/TiO₂ molecular ratio is equal to one, the Al₃Ti phase nearly disappears. High temperature metallurgical field caused by strong exothermic reaction influences the synthetic reaction greatly, and higher synthetic temperature was favorable to the synthesis of Al₂O_3p-TiC_p reinforce particles.

Key words:  XD technique; carbon content; in-situ  Al matrix composites