利用金相显微镜、扫描电镜、透射电镜和万能拉伸试验机等手段考察了粒度为0.3 μm的Al2O3颗粒(体积分数为26%)增强6061Al复合材料在热挤压前后的显微组织及室温拉伸性能.结果表明: 以10∶1的挤压比热挤压后复合材料组织的均匀性得到了明显改善,显微组织变化上呈现位错由压铸态的近无位错转变为位错有明显增殖特征,并促进了时效析出; 复合材料挤压材的抗拉强度、屈服强度和延伸率较压铸材普遍提高; 热挤压没有改变复合材料的断裂机制,由于挤压后颗粒分布均匀等原因,使复合材料的塑性得到改善.
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