The oxidation of liquid Al-Mg alloys during holding and casting can lead to issues resulting in a poor metal quality and dross formation. Historically, beryllium as a microalloying element has been used to inhibit the oxidation of high Mg alloys. Due to the negative health consequences an alternative is desired for beryllium.
Potential alternative microalloying elements to Be were investigated in gram and kg scale TGAs. The effects of Ca, Ce, Ga, Gd, La, Sc and Sr on the oxidation of a 5 % Mg alloy was investigated in a gram scale TGA. Additions of Ce, Ga, Gd, La and Sc were found to have no measurable inhibiting effect on the oxidation with additions up to 1000 ppm. Ca and Sr showed a potential inhibiting effect and were investigated in a kg scale TGA. The results on the effects of Ca and Sr on the oxidation will be presented.