Enhanced oxidation resistance in Mg-Y-Zn-Ho alloys via introducing dense low-oxygen-diffusion Ho2O3 oxide film

The effect of Ho addition on the oxidation behavior of Mg-Zn-Y-Ho alloys was investigated at 500 degrees 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.

Automated summary

The effect of Ho addition on the oxidation behavior of Mg-Zn-Y-Ho alloys at 500 degrees C in air was investigated. Results showed that the addition of Ho can improve the high-temperature oxidation resistance of Mg-3Y-2Zn-12Ho alloys. With a 12 wt% Ho addition, the parabolic rate constant decreased by 75% compared to alloys without Ho addition. This improvement can be attributed to the formation of dense Ho2O3, which reduces the inward oxygen diffusion coefficient by 3 orders of magnitude compared to Y2O3. Additionally, the addition of Ho in the Mg-Y-Zn alloy maintained excellent tensile properties.