Abstract
The effect of Ho addition on the oxidation behavior of Mg-Zn-Y-Ho alloys was investigated at 500 °C in air. The results show that Ho addition can improve the high-temperature oxidation resistance of Mg-3Y-2Zn-12Ho alloys. With the addition of 12 wt% Ho, the parabolic rate constant lowers by 75% as compared to that without Ho addition. The improvement of high-temperature oxidation resistance can be attributed to the formation of dense Ho2O3, which reduces the inward oxygen diffusion coefficient by 3 orders of magnitude as compared to Y2O3. Moreover, the addition of Ho element in the Mg-Y-Zn alloy remains excellent tensile properties.
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