The nano-ZrO₂-reinforced AZ31 alloy composites were fabricated by friction stir processing with three multi-passes and high rotation speeds. The AZ31/2.14 vol% ZrO₂, AZ31/4.29 vol% ZrO_2, and AZ31/6.43 vol% ZrO₂ composites were designed. The fine microstructure and uniform dispersion of ZrO₂ particles were observed in the AZ31/ZrO₂ composites. The excellent interfacial bonding was observed between the Mg matrix and ZrO₂. The hardness and tensile properties were enhanced after three cumulative friction stir processing passes. This was attributed to grain refinement and strengthening effects of ZrO₂. The tensile properties and hardness of the AZ31/ZrO₂ composite increased with the increase of volume fraction of the ZrO₂ particles from 2.14 to 6.43 vol%.

纳米ZrO ₂增强AZ31合金复合材料是通过三次多次摩擦和高转速的摩擦搅拌工艺制备的。设计了AZ31 / 2.14体积％ZrO ₂，AZ31 / 4.29体积％ZrO ₂和AZ31 / 6.43体积％ZrO ₂复合材料。在AZ31 / ZrO ₂复合材料中观察到ZrO ₂颗粒的精细微观结构和均匀分散。在Mg基质和ZrO ₂之间观察到了极好的界面结合。经过三次累积摩擦搅拌处理后，硬度和拉伸性能得到提高。这归因于ZrO _2的晶粒细化和强化作用。AZ31 / ZrO ₂复合材料的拉伸性能和硬度随着ZrO ₂颗粒的体积分数从2.14体积％增加到6.43体积％而增加。