This paper indicated that the strength and hardness of Al-Si alloys are, influenced slightly by superheating and Si content. However the ductility ( 6) is affected markedly by pouring temperature (i.e. superheating) and Si content too. For the hypereutectic Al-Si alloy the pouring temperature must be as minimum as possible to obtain the best properties. The Si segregation is influenced also by the Si content.A1-Si alloys are widely used in practice especially in automobile industry. This is due to its good properties, such as castability, low coefficient of thermal expansion, weldability, corrosion resistance, machinability, wear resistance, and good sliding properties [I].Good mechanical properties for Al-Si alloys can be achieved by grain refinement i.e. inoculating the molten metal with different kinds of inoculants.These inoculants improve and inhance the casting nucleation process for the primary grains and eutectic silicon. The used inoculants depend mainly on the refined phase. The a solid solution is refined with Ti and B, but the eutectic silicon is refined with Sr. On other hand the refining ofprimary silicon of hyper-eutectic A1-Si alloys is achieved by P. The La, Ce, Yt . . . etc are also used for inhancing the nucleation process. Not only the inoculation of molten metal affects the solidification process but also the pouring temperature (i.e. superheating), rate of mould diffksivity, and melt composition [7-91.
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