Magnesium AM60 based metal matrix hybrid nanocomposite (MHNC) reinforced with alumina (Al₂O₃) fibre and nano-sized Al₂O₃ particles was successfully fabricated by a perform-squeeze casting technique under an applied pressure of 90 MPa. Tensile properties of the unreinforced AM60 alloy, Al₂O₃ fibre/AM60 composite, hybrid composite containing both Al₂O₃ fibres, and micron and/or nano-sized Al₂O₃ particles were evaluated. The addition of fibres and/or micron-sized particles significantly improves the ultimate tensile and yield strengths of the matrix alloy from 171 and 81 MPa to 192 and 142 MPa, respectively, while a substantial reduction (73%) in ductility from 6.0% to only 1.6% is observed. The replacement of the micron particles with the nano-sized Al₂O₃ particles into the hybrid composite restores the ductility from 1.6% to 3.5%. Microstructure analyses via optical (OM) and scanning electron (SEM) microscopes suggest that the homogeneous distribution, clean interfacial structure and grain refinement result in the high strengths of the magnesium hybrid nanocomposite (MHNC). The observation by transmission electron microscopy (TEM) indicates that the presence of a relatively low dislocation density in the matrix grains of the MHNC benefits the ductility restoration. The SEM fractography shows that the fracture mode of the composites is the evolution of localized damages, such as particles and fibres damage and cracking, matrix fracture, and interface debonding, which are consistent with the tensile results.

通过性能挤压铸造技术在90 MPa的压力下成功制备了以氧化铝（Al ₂ O ₃）纤维和纳米级Al ₂ O ₃颗粒增强的AM60镁基金属基复合纳米复合材料。未增强的AM60合金，Al ₂ O ₃纤维/ AM60复合材料，同时包含Al ₂ O ₃纤维和微米和/或纳米级Al ₂ O _3的混合复合材料的拉伸性能评估了颗粒。纤维和/或微米级颗粒的添加显着提高了基体合金的极限拉伸强度和屈服强度，分别从171和81 MPa分别提高到192和142 MPa，而延展性从6.0％显着降低到73％。仅观察到1.6％。用纳米Al ₂ O ₃替代微米颗粒颗粒进入混合复合材料可将延展性从1.6％恢复到3.5％。通过光学（OM）和扫描电子（SEM）显微镜进行的微观结构分析表明，均匀分布，干净的界面结构和晶粒细化导致了镁杂化纳米复合材料（MHNC）的高强度。透射电子显微镜（TEM）的观察表明，MHNC的基体晶粒中存在较低的位错密度有利于延展性的恢复。SEM形貌表明，复合材料的断裂模式是局部损伤的发展，例如颗粒和纤维的损伤和开裂，基体断裂和界面剥离，这与拉伸结果一致。