用粉末冶金法制备了纳米SiC颗粒增强纯Al基复合材料(Al MMC),对该材料的微观结构和拉伸性能进行了研究.结果表明,纳米SiC颗粒在含量很少时即对Al有明显的强化作用.此时,纳米颗粒在基体中的分散比较均匀,且多位于Al的晶界处;当含量较高时则颗粒易于团聚.颗粒团聚体和晶界处的SiC颗粒会使SiC对Al的弥散增强效果明显低于理论预测值.纳米SiC颗粒含量发生变化,Al MMC的断裂机制也有所改变.
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