AlTi 5C 0.2 master alloy was prepared by the ex ot hermic dispersive synthesis using Al

Ti and C powders in Al melt. The reactive synthetic process of the master alloy and the generation mechanism as well as r efining fe atures of TiC particulate were investigated by means of OM

XRD and SEM. The res ults showed that the explosively exothermic reaction between Ti（s） and Al（l） for med chunky TiAl 3（s） particle in Al melt at 670 ℃ with elevating the melt tem perature in the reactive zone

and in turn TiAl 3（s） particle dissolved into Al melt to generate active Ti which diffused into the surface of carbon particle t o form TiC particle in coagulative state. The TiAl 3 particle changed from chunky to flaky shapes with obviously clustered TiC distribution with prolonging holding time

resulting in slight reduction of refining performance of the mast er alloy.