(宜春学院 物理科学与工程技术学院，宜春336000)
摘 要: 以AZ91合金为基体，采用液态分散技术+粉末冶金工艺+热处理工艺制备了四种纳米碳材料(碳纳米管、包覆氧化镁碳纳米管、石墨烯纳米片和氧化石墨烯)增强的镁基复合材料；测试了复合材料的力学性能，并利用光学显微镜、X射线衍射仪、扫描电子显微镜、透射电子显微镜等对复合材料微观组织、界面结构和断口形貌进行了表征及分析。结果表明：制备的四种复合材料料中，氧化石墨烯增强的镁基复合材料屈服强度和伸长率最好，分别为(312±4.5) MPa和11.3%±0.2%，比AZ91基体分别提高了85.7%和61.4%，表明四种纳米碳材料增强体中，氧化石墨烯更有益于提高镁合金的力学性能，有利于制备高性能镁基复合材料。
关键字: 镁基复合材料；纳米碳材料；界面结合；力学性能
（Physical Science and Technology College, Yichun University, Yichun 336000, China）
Abstract:Mg-based composites, using AZ91 alloy as matrix and reinforced with four kinds of nano-carbon materials (CNTs, MgO-coated CNT, GNS and GO), were fabricated by liquid dispersion technique, powder metallurgy process and T4 heat treatment, respectively. The mechanical properties of the composites were tested. The microstructure, interface structure and fractographs of the composites were characterized and via optical microscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX). The results show that the composite with GO exhibits the best mechanical properties among the four as-synthesized composites. The yield strength and elongation of the composite with GO are (312±4.5) MPa and 11.3%±0.2%, which are enhanced by 85.7% and 61.4%, respectively, comparing with AZ91 alloy. It means that GO is the best reinforcement among the four nano-carbon materials to strengthen the mechanical properties of AZ91 alloy, which is beneficial to fabricate the Mg-based composites with high performance.
Key words: Mg-based composite; nano-carbon materials; interfacial bonding; mechanical properties
