Influence of Magnesium on Hardness and Microstructure of ADC 12 Alloy Produced by Gravity Casting Method

Abstract

Magnesium addition produce modification level of silicon’s eutectic for Al-Si-Mg. An increase in magnesium content will increase mechanical properties value of ADC 12 alloy. Highest hardness value reached when Mg content is over 4%. Properties of material’s increased because Mg that added to the alloy will bind with Si and form Mg2Si compound. Where the Mg2Si compound will close the empty space in crystal structure of Al-Si-Mg and the distance between the grain is getting closer so that ADC 12 alloy possess improved strength and hardness. ADC 12 alloy with the addition of 8% magnesium variation will have the highest hardness value, which is 143.44 BHN