搅拌摩擦加工制备MWCNTs/Al复合材料的微观组织分析

Analysis on Microstructure of Multi-walled Carbon Nanotubes Reinforced Aluminum Matrix Composite Fabricated by Friction Stir Processing

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。

Aluminum matrix composite reinforced by different content of multi-walled carbon nanotubes（MWCNTs） was successfully fabricated by friction stir processing （FSP）. The microstructure and interface structure of the composite were analyzed by using TEM. The results show that the microstructure of the composite has micron grade ultrafine grain. The grain size decreases with the increase of the pass of FSP. There are a large number of dislocations in aluminum matrix grain, and the dislocation tangle appears in local position. Nanoscale short clavite ALC3 phase dispersively distributes in Al matrix. The bonding between carbon nanotubes and Al matrix is tight. The new phase does not appear in inerface.