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用搅拌摩擦加工法制备碳纳米管增强铝基复合材料,并对其组织及硬度进行了分析。结果表明:搅拌摩擦中心区晶粒尺寸与轴肩变形区相似,晶粒比较细小;搅拌摩擦区边界的晶粒组织发生了明显的塑性变形,晶粒被扭曲拉长。碳纳米管在搅拌摩擦中心区均匀分散,和基体结合良好。碳纳米管对基材有明显的强化作用,搅拌摩擦中心区硬度在55 HV左右,是纯铝的2倍。
Preparation of carbon nanotubes reinforced aluminum matrix composites by friction stir processing and their microstructure and hardness were analyzed. The results show that the grain size in the center of friction stir is similar to the deformation zone of the shoulder, and the grain size is relatively small. The grain structure at the boundary of the friction stir zone undergoes obvious plastic deformation and the grain is elongated and distorted. Carbon nanotubes in the friction stir uniform dispersion center, and the substrate with good. Carbon nanotubes on the substrate significantly enhanced the friction stir center hardness of about 55 HV, is 2 times the pure aluminum.