The microstructure characteristics and refining ability of Al-Ti-C master alloy prepared by liquid-solid reaction were investigated by SEM and TEM

and the liquid-solid synthesized mechanism was analyzed from the view of thermo-kinetics also. The results indicate that the microstructure of the Al-Ti-C master alloy is composed of dendritic TiAl

3

phase and particle TiC

where TiC belongs to non-stoichiometric ratio compound in the form of TiC

x

for x of 0.5

0

.8

whose lattice contant is 0.430

0

.433 nm. The master alloy can obviously refine microstructure of the Al alloy

which is resulted from the occurrence of instantaneous high temperature in the interface of liquid-solid meet the thermal-kinetics conditions of Ti and C reaction during liquid-solid reaction. The formation of Al-Ti-C master alloy belongs to the solution-precipitation mechanisms

which consists of three groups of primitive reactions.