Abstract
Aluminum-silicon castings (Al-Si) is commonly used for excellent low-cost cast ability and varied microconstituents. The mechanical properties of Al-Si alloys are related to the size, morphology, and distribution of the primary and eutectic Si phases. The irregular-shaped primary and the acicular eutectic Si phase induce stress concentration at the tip of secondary phases, which occurs at the crack origin. This condition results in deterioration of ductility. This study discuss on the effect of composition percentage and pouring temperature of Al-Si alloy at various content of 7%, 12% and 15%. The pouring temperature will be varied at 570 ° C, 600 ° C and 650 ° C. The highest value of the tensile test for Al-Si alloys was owned by the Al 12% Si mixture at the pouring temperature of 600 oC. This condition is due to the occurrence of the eutectic mixture which has a non-lamellar shape and appears in the cross-section of the microstructure. The visible section consists of like pieces that appear separate but are actually interconnected when viewed in three dimensions. As a result of the formation of nonlamellar regions and the existing shale connections, it is difficult to shift when given the test load.
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