Effect of Iron Impurity and a Cd Trace Addition on the Delayed Ageing of Al-7Si-0.3 Mg Casting Alloy

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Abstract
Iron in aluminium alloys is considered to be an impurity. It forms intermetallic compounds with Al and elements Si and Mg; these coarse intermetallic compounds impair the mechanical properties. An increase in hardness and decrease in UTS, YS, and ductility was observed with an increase in Fe content in the range 0.2 to 0.8% in an Al-7Si-0.3Mg Alloy. Further analysis showed higher hardening rate of the alloy at 0.8% Fe compared to 0.2% Fe with the tensile flow curves. Studies were carried out on the effect of chemical composition (Mg, Fe), solidification rate, heat treatment (delayed ageing with Cd trace addition) on microstructure and mechanical properties of the alloy. Chill castings were found to possess higher mechanical properties than sand castings.

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