Effects of Si, Cu, Mg and Mn on mechanical properties of ADC 12 alloy were studied. The optimal composition of the ADC12 cast aluminum alloy for automobile engine cylinder block was ascertained. It is 1 1 Si, 2.5Cu, 0.3Mg and 0.5Mn (wt%). The mechanical properties are tensile strength of 236.5MPa, and elongation of 3.88%.
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