Abstract:A novel in-situ process-Reaction Synthesis has been used to fabricate Al/TiC compas-ites，the phase constitute，microstructure and mechanical property of the Al/TIC composite have been investigated by the use of XRD and SEM. It has been shown that the reaction synthesized TiC paxticu-late is submicron in size(abaut 0. 1一0. 8μm)，spherical in shape and smooth in surface. In macrostruc-tore the distribution of the TiC particulate in matrix is homogeneous。 Gut in micostructure there is mi-
cro-segregation of the TiC particulate at the intergrannular. The cast structure become fine because of the existence of the TiC particulate. In addition, with the increasing of weight percentage of TiC partic-ulateg.al in alloy，the yield strength and ultimate tensile strength of the composite increase significantly, e.g.at 15%TiC, 1I7% and 103% increase respectively, in the same time the elongation of the composite is still more than 4. 5%. In the end，the composite. The results show that the analysis has been done by SE1VI on the fracture morphology of the fracture is ductility, and mainly because of the cluster of TiC particulate to tntergrannular and the synthesis of bar morphology A1₃Ti.

Key words: composites    microstructure   mechanical property     particulate   reaction synthesis