Abstract
This paper explores the possibility of developing an Al-Mg2Si-Mg-Zn based sand cast alloy having improved mechanical properties. The effect of Zn and free Mg after combining with Si to form Mg2Si on microstructure and mechanical properties was investigated under as-cast condition. Eight different alloys were prepared by varying Mg(4.15 – 12.0 wt.%) and Zn(2.58 – 6.22 wt.%) contents and 0.2 proof strength, tensile strength, elongation at failure and hardness were measured under as-cast condition. The microstructural investigation was conducted by optical microscopy and all alloys were found to contained α-Al, Al-Mg2Sieutectic and Mg2Siphases. The addition of Mg generally improves the proof strength and decreases the elongation, while the tensile strength shows a peak for alloys having Mg contents between the range 3 – 6 wt.%. Addition of Zn content also has the similar effect in improving strength and hardness and decreasing ductility. Comparing all alloys, alloy 3having 5.41wt.%Mg, 1.85%Si and 5.45%Zn has the best combination of properties.
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