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采用搅拌摩擦加工技术(FSP)制备多壁碳纳米管增强铝基(MWCNTs/A1)复合材料,并对该复合材料的显微结构和硬度进行分析。结果表明:MWCNTs/Al复合材料显微结构为细小的等轴晶,晶粒大小不均匀;MWCNTs与Al基体界面结合良好,界面处分布大量的位错,MWCNTs主要分布在晶内;动态再结晶形核方式为亚晶形核,在原始晶粒和已形成的亚晶内形核,经动态再结晶使晶粒逐步细化;MWCNTs/Al复合材料的硬度随MWCNTs含量增加呈上升的趋势,当CNTs体积分数为6%时,MWCNTs/Al复合材料硬度达Hv63.4,为纯Al经5次FSP硬度的1.9倍。

Multi-walled carbon nanotubes(MWCNTs) reinforced Al matrix composites were prepared by friction stir processing(FSP). The microstructure and hardness of the composites were investigated. The results show that the MWCNTS/Al is composed of fine equiaxed grains but the grains are uneven. The interface between MWCNTs and the matrix is well binded. A large numbers of dislocations were distributed in the interface. MWCNTs mainly distributed within the aluminum grains. The grain refinement is realized by recrystallization through a subcrystal nucleating mode. The nucleis form nucleus in the primary grains and the formed subcrystal. Therefore, the grains are refined gradually. With increasing MWCNTs content, the hardness of MWCNTs/Al composite increases. When the volume fraction of MWCNTs is 6 %, the microhardness is HV 63.4 which is 1.9 times as hard as Al made after 5 times of FSP.

参考文献

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