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采用搅拌摩擦加工技术制备了不同含量多壁碳纳米管增强铝基复合材料,并利用透射电镜对该复合材料的微观组织和界面结构进行分析。结果表明:该复合材料组织具有微米级的超细晶粒,晶粒尺寸随搅拌摩擦加工道次的增加而逐渐减小;铝基体晶粒中存在大量位错,并在局部形成位错缠结;在铝基体中有纳米级短棒状Al_4C_3相弥散分布;碳纳米管与铝基体之间结合紧密,界面处未发现有新相生成。
The multi-walled carbon nanotubes reinforced aluminum matrix composites with different content were prepared by friction stir processing. The microstructure and interfacial structure of the composites were analyzed by transmission electron microscopy. The results show that the microstructure of the composites has micron-sized ultra-fine grains, and the grain size decreases with the increase of the friction stir-processing pass. There are a large number of dislocations in the aluminum matrix grains and dislocation tangling In the aluminum matrix, there was a dispersion of nano-sized short rod-shaped Al_4C_3 phase. The binding between the carbon nanotubes and the aluminum matrix was close, and no new phase was found at the interface.