高能球磨时间对CNTs/Al5083纳米晶粉体微观组织及性能的影响  

Effect of Milling Time on Microstructure and Performance of CNTs/Al5083 Composite Powder

作　　者：李铮[1] 蔡晓兰[1] 易峰[1] 余名俊[1] 

机构地区：[1]昆明理工大学冶金与能源学院,云南昆明650000

出　　处：《热加工工艺》2014年第18期114-117,120,共5页Hot Working Technology

摘　　要：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。5083 aluminum alloy produced from elemental powders and reinforced by the addition of 2wt% carbon nanotubes was synthesized by mechanical alloying（MA）. The microstructure of nano-composite and the interface between aluminum matrix and CNTs were examined by using SEM and TEM. The results show that CNTs are well dispersed in 5083 aluminum alloy by high energy ball milling（HEM）, and embedded in the compose powder. But a long time of milling, the breakages of the CNTs are visible by TEM. X-Ray Diffraction（XRD） analysis show that, with the increase of milling time, the magnesium is solid solution in aluminum. The average grain size of the composite powder initially reduces. At 2.5 h milling time, the average grain size is 46.4nm.With prolonging the milling time, the average grain size increases due to the recrystallization.

关 键 词：机械合金化 铝基复合材料 动态再结晶 晶粒尺寸 

分 类 号：TB333[一般工业技术—材料科学与工程]