The semi-solid A356 alloy parts were forged with 2000 kN vertical hydraulic press by squeeze casting.Effects of pouring temperature and extrusion pressure on microstructure and mechanical properties of the squeezing casting semi-solid A356 aluminum alloy parts were investigated.The results show that grains size can be refined and spheroidized with more compact

and tensile strength

yield strength and elongation are increased greatly with increasing in the squeeze pressure.However

with squeeze pressure more than 48.7 MPa

its effects on microstructure and properties of the parts prepared can be ignored.With a lower pouring temperature

crack easily occurs in the parts due to the higher solid fraction resulting in adequate filling

while with a higher pouring temperature

dendrite is dominant in the microstructure of the parts prepared as a result of high liquid fraction

which are responsible for the deterioration of mechanical properties.The acceptable microstructure and mechanical properties of the parts prepared can be presented by squeezing casting at 582 ℃ and 48.7 MPa

where tensile strength and elongation of the parts prepared reach 288 MPa and 14.6%

respectively.