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In this paper, the magnesium matrix composites reinforced by in situ TiB2, Mg2Si and MgO particles are fabricated from AZ91-K2TiF6-KBF4-SiO2 system via the melt in situ reaction technology, and the phases components, microstructures and mechanical properties are investigated by XRD, SEM. The results indicate that the in situ particles are uniformly distributed and dispersed uniformly in the magnesium matrix, and Mg17Al12 dispersed in macro-view with mass-shape, bone-shape, or strip-shape in a long-range dimension, the interfaces between the in situ particles and magnesium matrix are neat. The mechanical properties tests show that the tensile strength and HB hardness of the as-prepared composites are highly increased by 20.59% and 25.21% than that of the AZ91 alloy, reach 210.32MPa and 73.36N/mm2, respectively. The fracture mechanisms are the hybrid fracture mechanisms: the plastic fracture and cleavage fracture. |
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Keywords:Magnesium matrix composites; AZ91-K2TiF6-KBF4-SiO2 system; In situ reaction; Mechanical properties |
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