Abstract
Magnesium alloy composites play an important role in the biomaterials field. In this study, a novel Mg-Zn-Ca matrix composite was reinforced by adding 1.0 wt.% MgO nanoparticles via the high shear casting process. Hereafter, friction stir processing (FSP) was used to achieve a good dispersion of MgO particles and improve the mechanical properties of the composites. After the preparation of the novel composite materials, varied characterization and performance test methods have been selected for comparison. The results illustrate that through FSP, the corresponding microstructure and properties of as-cast MgO/Mg-Zn-Ca composites were significantly modified, and the best combination of the key parameters is 1200 rpm and 60 mm/min for rotational velocity and traveling speed, respectively. After the optimized FSP treatment, the grain size in FSP-processed composites was refined by 42%, to reach 1.04 μm. Due to the grain refinement and the redistribution of MgO particles, the hardness of the FSP-processed MgO/Mg-Zn-Ca composites was increased by 40%, to reach 101.2 HV. Further, it displayed excellent corrosion resistance as well as strength. Compared to the strengthening through grain refinement, particle strengthening is more dominant based on the study. And meanwhile, the modified grains and added MgO particles are beneficial to the properties of the nugget zones.
Highlights
Magnesium (Mg) alloys have become one of the hot topics in many fields due to their adjustable mechanical behavior and corrosion resistance [1, 2]
Khalajabadi et al [9] have used the powder metallurgy method to prepare Mg/HA/MgO nanocomposites, and the results show that with more MgO, the corrosion resistance turns better and better, which is due to thicker product film, and subsequent reduction of pitting corrosion
Since a high heat input is possible to result in the plastic flow of materials, higher heat input is preferred in the FSP of the MgO/Mg-Zn-Ca composite if the surface quality can be controlled in good quality
Summary
Magnesium (Mg) alloys have become one of the hot topics in many fields due to their adjustable mechanical behavior and corrosion resistance [1, 2]. MgO has improve the mechanical behavior of the material, and the effect of increased corrosion resistance. Lei et al [10] have prepared MgO/Mg-Zn composites and found that the addition of MgO led to both grain refinement and second phase strengthening, and mechanical properties and corrosion resistance are significantly improved.
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