Effects of solidification pressure under different pressurizing processes on the relative density of Al-Cu Alloy in vacuum counter-pressure casting were investigated through testing and analyzing the relative density across the ZL205A samples subjected to different solidification pressure. The results indicate that under singlecontrolled pressurization of vacuum counter-pressure casting

the relative density of different wall samples is improved with the increase of solidification pressure. Changing trend of the density exhibits V shape from gate to the top

moreover

the relative density is much more homogeneous with the increase of solidification pressure. Meanwhile

the relative density under grade-controlled pressurization is higher than under single-controlled pressurization. Under the same solidification pressure

the relative density is increased with the increase of wall thickness.