The semi-solid stirring casting method was employed to prepare the 17% SiC

p

/A357 aluminum matrix composites.The effects of the processing parameters including stirring temperature

stirring rate and stirring time on the homogeneous distribution of SiC

p

particles were investigated and the process was optimized.The results reveal that the stirring in semi-solid temperature range of the alloy is beneficial to reduce inspiratory and promote uniform distribution of SiC

p

particles compared with liquid stirring

while SiC

p

particles will be pushed to the boundary by larger primary phase during the process with a lower temperature

resulting in uneven distribution of SiC

p

particles.The distribution uniformity of SiC

p

can be increased by increasing stirring rate and prolonging stirring time

which will tend to be deteriorated with a longer time.The optimized stirring process parameters under test conditions are presented as follows:stirring temperature of 610℃

stirring speed of 800 r/min

stirring time of 20 min.SiC

p

particles are evenly distributed in the ingot structure of large-scale aluminum matrix composites with φ240 mm×330 mm and 41 kg.