الفهرس 
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Abstract
The mechanical properties of aluminum alloy castings are affected by porosity which is caused by a combination of dissolved gases and shrinkage. The objective of this research is to study the effects of Multiplied pressure die casting parameter on the porosity and mechanical properties of die cast ADC12 alloys, Optimization of porosity formation and Find the optimal process conditions in pressure die casting associated with the minimum porosity percent and high ductility with high strength level. Aluminum castings were produced by cold- chamber die casting the cold chamber process has been favored for its unique ability to transform the injected molten aluminum into an accurately dimensioned form in the shortest possible cycle time. Although high pressure die casting is a very precision process; there are lots of factors which are effective on the product quality and mechanical properties. The microstructures of as-cast samples were examined by using optical microscopy, and scanning electron microscopy (SEM), x-ray radiography, and The mechanical properties were investigated by tensile test were performed on samples of the die casting . The results showed that the effect of various input parameter (Holding furnace temperature (ºC), Plunger Velocity of 2nd stage (m/s) and Multiplied Pressure (kg/Cm2)), on the mechanical properties and porosity of HPDC ADC12 aluminum alloy were investigated in this study. The optimum process parameters values predicted for casting of minimum shrinkage porosity and the best combination parameters given as follows: pouring temperature 700∘C, Plunger velocity, 2nd stage 1m/s, Multiplied pressure 490kg/Cm2, The model proposed in this paper gives satisfactory results in the optimization of pressure die casting process.