SiC

p

/2024 aluminum matrix composites with a volumetric fraction of 60% SiC

p

were prepared using a powder semi-solid thixoforming process.The effects of SiC

p

article morphology and heat treatment on the properties of the composites prepared were investigated.The results reveal that the composite reinforcement particles prepared by surface-shaped SiC

p

articles are uniformly dispersed in the aluminum matrix

and the relative density can reach 99.97%.After the stress relief annealing and T6 heat treatment

the composites present the desirable comprehensive performance

and the flexural strength and hardness of the composites are obviously improved

which is 47.5%and 57.7%higher than those of ones before heat treatment.The fracture of the composites exhibits a cleavage fracture of SiC as a whole

and the matrix exhibits tearing behavior.After SiC particle shaping and composite annealing as well as T6 heat treatment

the CTE of the composites is reduced to（4.85～8.51）×10

-6

℃

-1

and（4.86～8.32）×10

-6

℃

-1

respectively.The improved H-J model is better suitable for mixed reinforcement and bimodal particle size distribution.After SiC particle shaping and composite annealing as well as T6 heat treatment

the TC of the composites is significantly improved

reaching 195 W·m

-1

·K

-1

and 206 W·m

-1

·K

-1

respectively.