轧制对纳米碳管弥散强化铜基复合材料微观组织的影响  

Effects of rolling on microstructure of carbon nanotube dispersion strengthened copper alloys

作　　者：孟飞[1] 裴燕斌[1] 果世驹[1] 

机构地区：[1]北京科技大学材料科学与工程学院粉末冶金研究所,北京100083

出　　处：《粉末冶金材料科学与工程》2005年第1期55-59,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家八六三计划资助项目(2001AA337010)

摘　　要：利用粉末冶金工艺结合轧制退火工艺制备了纳米碳管弥散强化铜复合材料, 研究了轧制对纳米碳管在铜基体中分布的影响。材料冷轧轧下量60%时, 含纳米碳管0.3%的铜基复合材料致密度由轧制前的78.7%提高到98.9%, 同时显微硬度由HV49.2上升到96.4。扫描电镜照片表明, 随着纳米碳管分数增多、轧制量增大, 复合材料微观组织中出现的孪晶数目增多。孪晶引起的晶粒细化并通过纳米碳管弥散强化而保持, 可能是纳米碳管铜复合材料增强的机制。Fabrication and microstructure of copper matrix composite reinforced by the multi-wall carbon nanotubes (CNTs) were investigated. Powder metallurgy technique was employed combined with cold rolling and annealing. The obtained results demonstrated that cold rolling can not only greatly improve the homogeneous distribution of agglomerate CNTs but also result in a certain amount of twin-boundaries. The density and Vickers's hardness increase considerably after rolling and annealing. The required relative density of copper alloy with 0.3% CNTs is ~98.9% . The value of microvickers hardness is 96.4. The mechanism of strengthening was also discussed.

关 键 词：纳米碳管 弥散强化铜 粉末冶金 轧制 孪晶 

分 类 号：TF124[冶金工程—粉末冶金]