Squeeze casting which often known as called liquid metal forging where molten metal is solidified under relatively high external pressure. Contact between molten metal with punch and die enable to increase the rate of heat transfer. The microstructure of the casting will be more homogenous and the mechanical properties will be improved.The material used this investigation is taken from commercial piston product with the following composition bal. : 12.62 wt% Si, 2.83 wt% Cu, 1.58 wt% Ni, 0.89 wt% Mg, 0.38 wt% Fe, 0.15 wt% Mn, 0.078 wt% Zn, 0.016 wt% Pb, 0.009 wt% Sn, 0.006 wt% Ca dan Al. The material melted up to 700oC, the specimens were made using direct squeeze casting by combining pressure and temperature. Finally the specimens were examined through hardness, porosity and microstructure.The results show the solidification rate significantly improves the properties of the specimen. The process decrease quantity of the porosity up to 85.15 % and increase the Britnell hardness 5.29% after heat treated (T6). The optimum pressure and temperature is 70 - 100 MPa and 400 - 700oC.
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