(1. 南昌航空大學 航空制造工程學院，南昌 330063；
2. 中國航空工業(yè)昌河飛機工業(yè)有限責任公司 55車間，景德鎮(zhèn) 333000)
摘 要: 采用攪拌摩擦加工技術制備體積分數(shù)為19.5%的多壁碳納米管(MWCNTs)增強AZ80鎂基復合材料，研究經(jīng)多道次攪拌摩擦加工(FSP)加工后復合材料的顯微組織和MWCNTs在基體中的分布和穩(wěn)定性，分析MWCNTs與基體的界面結構特征。結果表明：多道次FSP能提高MWCNTs在基體中的分散性，并在基體中形成了納米晶，晶體尺寸僅5 nm左右。經(jīng)多道次FSP后，MWCNTs在徑向上的多壁結構未受到機械損傷，但經(jīng)7道次加工后，在復合材料中發(fā)現(xiàn)有少量Al4C3相；碳納米管與鎂基體以半共格的界面形式相接。
關鍵字: 攪拌摩擦加工；多壁碳納米管；鎂基復合材料；顯微組織
（1. School of Aeronautical Manufacturing and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. 55 Workshop, China Aviation Industry Changhe Aircraft Industry Co., Ltd, Jingdezhen 333000, China）
Abstract:The multi-walled carbon nanotubes(MWCNTs) with volume fraction of 19.5% reinforced AZ80 magnesium matrix composites were prepared by friction stir processing(FSP). The microstructures of the composites were investigated. The distribution and stability of MWCNTs in the composites were investigated. The structural feature of the interface between MWCNTs and matrix was analyzed. The results show that the stability of MWCNTs in matrix is enhanced by multi-pass FSP. The nanocrystals with size of about 5 nm form in the composites. The multi-walled structures of MWCNTs along the diameter direction are not damaged by multi-pass FSP. There are a few Al4C3 phase in the composites after 7 passes by FSP. MWCNTs and magnesium matrix are joined in the form of semi-coherent interface.
Key words: friction stir processing; multi-walled carbon nanotube; magnesium matrix composite; microstructure
