4.6 Article

Influence of Lanthanum oxide on AZ31 magnesium composite properties

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MATERIALS LETTERS
卷 351, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.matlet.2023.135014

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Composite materials; Magnesium; AZ31; Lanthanum oxide; Rare earth oxides; Wear and tribology

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Magnesium metal matrix composites, especially AZ31+(0.5 to 2 wt%) La2O3 composites, are used for wear-resistance applications. The addition of La2O3 increases the density and hardness of the composites, while maintaining a homogeneous distribution of elements. The AZ31 + 1.5 wt% La2O3 composite exhibits the lowest friction coefficient and wear rate, with a smoother worn surface compared to other composites.
Magnesium metal matrix composites are used for wear-resistance applications such as engine liners, cylinder blocks, and friction materials. In this study, AZ31+(0.5 to 2 wt%) La2O3 composites are prepared through a powder metallurgy process. Notably, when the percentage of La2O3 increase, the density of reinforced composites increases by 3%, and hardness increase by 25%. The microstructure mapping shows the homogeneous distribution of Mg, Al, Zn, La, and O elements throughout the composites. AZ31 + 1.5 wt% La2O3 composite has the lowest friction coefficient of 0.20 and lower wear rate of 2.73 x 10-3 mm3/m at 20 N. The worn surface of this composite has minor grooves, plows, and fewer wear particles compared to other composites.

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