The microstructure and mechanical properties of ADC14 squeeze castings were analyzed.It is found that there exist porosities in the different location

and the porosity contents are increased with increasing in distance from the ingate.In addition

serious enrichment and segregation of the primary Si particles appeared in the central of the casting gauge parts

which should be responsible for the inferior mechanical properties.In the early solidification

non-equilibrium crystallization happens and a large number of primary phase α-Al is formed at the casting surface as a result of squeezing force and high cooling rate

resulting in Si enrichment in the residual liquid.Furthermore

during following solidification periods

the forced feeding flow resulted from squeeze force made the Si riched liquid flow to the center of the gauge part

which are responsible for the serious positive segregation of Si contents and particles there.