(宜春學(xué)院 物理科學(xué)與工程技術(shù)學(xué)院，宜春336000)
摘 要: 以AZ91合金為基體，采用液態(tài)分散技術(shù)+粉末冶金工藝+熱處理工藝制備了四種納米碳材料(碳納米管、包覆氧化鎂碳納米管、石墨烯納米片和氧化石墨烯)增強(qiáng)的鎂基復(fù)合材料；測(cè)試了復(fù)合材料的力學(xué)性能，并利用光學(xué)顯微鏡、X射線衍射儀、掃描電子顯微鏡、透射電子顯微鏡等對(duì)復(fù)合材料微觀組織、界面結(jié)構(gòu)和斷口形貌進(jìn)行了表征及分析。結(jié)果表明：制備的四種復(fù)合材料料中，氧化石墨烯增強(qiáng)的鎂基復(fù)合材料屈服強(qiáng)度和伸長(zhǎng)率最好，分別為(312±4.5) MPa和11.3%±0.2%，比AZ91基體分別提高了85.7%和61.4%，表明四種納米碳材料增強(qiáng)體中，氧化石墨烯更有益于提高鎂合金的力學(xué)性能，有利于制備高性能鎂基復(fù)合材料。
關(guān)鍵字: 鎂基復(fù)合材料；納米碳材料；界面結(jié)合；力學(xué)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
