论文部分内容阅读
采用机械合金化法制备出2wt%CNTs/Al5083纳米晶复合粉体,研究了高能球磨时间对CNTs/Al5083纳米晶粉体性能的影响。利用XRD、SEM和TEM对该复合粉体的形貌及显微组织进行观察。结果表明,延长球磨时间可改善CNTs在Al5083粉末中的分散性,并使CNTs逐渐嵌入到金属粉末中,同时使复合粉体的晶粒细化。在球磨2.5 h时,晶粒尺寸达到46.4nm。另外,2.5h的球磨时间,会破坏CNTs的结构,同时诱发动态再结晶,使晶粒变粗,不利于粉末烧结。
2wt% CNTs / Al5083 nanocrystalline composite powders were prepared by mechanical alloying and the effect of high-energy ball milling on the properties of CNTs / Al5083 nanocrystalline powders was investigated. The morphology and microstructure of the composite powder were observed by XRD, SEM and TEM. The results show that prolonging the ball milling time can improve the dispersibility of CNTs in Al5083 powder and gradually embed the CNTs in the metal powder, meanwhile refine the grain of the composite powder. When milling for 2.5 h, the grain size reached 46.4 nm. In addition, 2.5h ball milling time, will destroy the structure of CNTs, while inducing dynamic recrystallization, the grain coarsening, is not conducive to powder sintering.