Abstract
The aim of the present study was to investigate the effect of Al2Ca added Mg addition on the oxidation behavior of Al-5Mg alloy in the liquid state with TGA and melt oxidation test. Results of TG analysis showed that while the weight gain of Al-5Mg was 10%, Al2Ca added Al-5Mg had the weight gain to 0.01%. Comparison between the surface and cross sectional appearance showed that there were a large number of pores and oxide clusters in Al-5Mg alloy, while pore was not observed in Al2Ca added Al-5Mg alloy. SEM and EDS studies revealed that the formation of pores in Al-5Mg alloy was mainly due to the transformation of MgO to MgAl2O4 as the holding time was extended. In the case of Al2Ca added Al-5Mg alloys, the existence of MgAl2O4 was not observed. On the other hand, MgO/CaO mixed layer existed and would act as a protective layer.
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