High-energy ball milling (HEBM) combined with powder metallurgy route was used to fabricate carbon nanotube (CNT) reinforced 7055Al composites. Two powder morphology evolution processes (HEBM-1 and HEBM-2) were designed to investigate the dispersion and damage of CNTs during HEBM process. HEBM-1 evolution process involved powder flattening, cold-welding and fracture, while HEBM-2 evolution process consisted of powder flattening and fracture. For HEBM-1, the repetitive fracture and cold-welding process was effective for dispersing CNTs. However, the powder flattening process in HEBM-2 was unsuccessful in dispersing CNTs due to two reasons: (1) the thickness of flaky Al powders exceeded the critical value, and (2) the clustered CNTs embedded in flaky Al powders could not be unravelled. Because of the broadening of D band and the appearance of a new defect-related D’ band, product of I_D/I_G and full width half maximum of D band, rather than I_D/I_G, was used to evaluate the actual damage of CNTs. It indicates that the damage of CNTs was severe in powder flattening and fracture stages, while the damage of CNTs was small in powder cold-welding stage.

采用高能球磨（HEBM）结合粉末冶金的方法制备了碳纳米管（CNT）增强的7055Al复合材料。设计了两种粉末形态演变过程（HEBM-1和HEBM-2）来研究CNT在HEBM过程中的分散和破坏。HEBM-1的演变过程包括粉末的展平，冷焊和断裂，而HEBM-2的演变过程包括粉末的展平和破裂。对于HEBM-1，重复的断裂和冷焊工艺对于分散CNT是有效的。然而，由于以下两个原因，HEBM-2中的粉末展平工艺未能成功地分散CNT：（1）片状Al粉的厚度超过了临界值；（2）无法解开嵌入在片状Al粉中的簇状CNT。 。使用I _D / I _G和D带的全宽最大值的一半而不是I _D / I _G来评估CNT的实际损坏。这表明在粉末展平和断裂阶段，碳纳米管的破坏严重，而在粉末冷焊阶段，碳纳米管的破坏较小。