Nano-MgAl₂O₄ particles and Mg_xAl_(1-x)B₂ whiskers co-reinforced Al matrix composites were prepared through powder metallurgy and hot working processes, involving ball-milling, cold pressing, sintering, repressing, and hot extrusion. The microstructure, tensile strength and hardness of the composites, the phase composition of the particles and the whiskers, and the interface between the whisker and the aluminum matrix were investigated systemically. The results show that during the hot extrusion, the reinforcements are uniformly distributed in the matrix, and the whiskers are arranged in the direction of extrusion. The whiskers are hexagonal prisms with close-packed hexagonal crystal structure and all the inner angles are 120°. Besides, the whisker elongates along the [0001] crystal orientation, and the six planes of the sidewalls belong to the {10$\overline{1}$0} family of crystal planes. As the content of reinforcement increases, the strength and hardness of the composites increase, while the elongation decreases. The composite contained 25.2 wt% reinforcements has a tensile strength of 400 MPa and a hardness of 124 HV.

纳米MgAl ₂ O ₄颗粒和Mg _x Al _（1-x） B ₂通过粉末冶金和热加工工艺（包括球磨，冷压，烧结，压制和热挤压）制备了晶须共增强的Al基复合材料。系统地研究了复合材料的微观结构，拉伸强度和硬度，颗粒与晶须的相组成以及晶须与铝基体之间的界面。结果表明，在热挤压过程中，增强材料均匀地分布在基体中，并且晶须沿挤压方向排列。晶须是具有紧密堆积的六边形晶体结构的六边形棱柱，所有内角均为120°。另外，晶须沿着[0001]晶体取向伸长，并且侧壁的六个平面属于{10$\overline{\mathrm{1个}}$0}系列水晶飞机。随着增强材料含量的增加，复合材料的强度和硬度增加，而伸长率降低。包含25.2 wt％增强材料的复合材料的拉伸强度为400 MPa，硬度为124 HV。