Abstract
Magnesium alloys of AZ31 containing (0.5, 1, 1.5) wt.% of initially added CaO particles were cast in air, and their oxidation behavior was studied at <TEX>$450-650^{\circ}C$</TEX> in air. The initially added CaO particles either decomposed to dissolve in the <TEX>${\alpha}$</TEX>-Mg matrix or precipitated as <TEX>$Al_2Ca$</TEX> along the grain boundaries of the matrix during casting. The ignition temperatures were <TEX>$565.4^{\circ}C$</TEX> for AZ31, <TEX>$608.6^{\circ}C$</TEX> for AZ31+0.5 wt.%CaO, and <TEX>$689.7^{\circ}C$</TEX> for AZ31+1 wt.%CaO. No ignition occurred for AZ31+1.5 wt.%CaO up to <TEX>$700^{\circ}C$</TEX>, displaying good oxidation resistance. The CaO-rich oxide scales that formed on the surface of the AZ31+(0.5, 1, 1.5) wt.%CaO alloys improved the oxidation resistance of AZ31 alloys.
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