(1. 福州大學(xué)材料科學(xué)與工程學(xué)院，福州 350116；
2. 福建工程學(xué)院材料科學(xué)與工程學(xué)院，福州 350118；
3. 福建省新材料制備與成形技術(shù)重點(diǎn)實(shí)驗(yàn)室，福州 350118)
摘 要: 碳納米管(CNT)和石墨烯(Graphene)擁有優(yōu)秀的力學(xué)和物理性能，是金屬基復(fù)合材料中理想的增強(qiáng)體。本文采用球磨工藝+氫熱還原法將碳納米管(CNT)和還原氧化石墨烯(RGO)引入到鋁粉表面構(gòu)建CNT-RGO混合增強(qiáng)體，然后利用放電等離子燒結(jié)系統(tǒng)(SPS)和軋制工藝，制備CNT-RGO/Al復(fù)合材料。通過(guò)EBSD、SEM、TEM以及拉伸等方法分析研究了CNT-RGO/Al復(fù)合材料內(nèi)CNT和RGO增強(qiáng)相分布、界面結(jié)構(gòu)、晶粒形貌和力學(xué)性能，探索了復(fù)合材料內(nèi)CNT和RGO的協(xié)同強(qiáng)化機(jī)制。結(jié)果表明：CNT-RGO/Al復(fù)合材料表現(xiàn)出優(yōu)異的力學(xué)性能，屈服強(qiáng)度和抗拉強(qiáng)度分別為228 MPa和268 MPa，比純鋁的屈服強(qiáng)度和抗拉強(qiáng)度分別增大了153%和143%，伸長(zhǎng)率仍保持在8.5%。復(fù)合材料內(nèi)還原氧化石墨烯的添加不僅促使一維的CNT和二維的RGO形成橋連結(jié)構(gòu)，有益于載荷的傳遞，而且能夠調(diào)控C與Al基體間的界面反應(yīng)，有利于復(fù)合材料的C-Al界面結(jié)合。CNT-RGO混合增強(qiáng)體協(xié)同強(qiáng)化效果優(yōu)于單純的一維CNT增強(qiáng)體。
關(guān)鍵字: 鋁基復(fù)合材料；碳納米相；微觀組織；力學(xué)性能；界面特征
（1. School of Materials Science and Engineering, Fuzhou University,
Fuzhou 350116, China;
2. School of Materials Science and Engineering, Fujian
University of Technology, Fuzhou 350118, China;
3. Fujian Provincial Key Laboratory of Advanced
Materials Processing and Application, Fuzhou 350118, China）
Abstract:Carbon nanotubes (CNT) and graphene (Graphene) have excellent mechanical and physical properties and are ideal reinforcements in metal matrix composites. In this paper, ball milling process and hydrogen thermal reduction method were used to construct CNT-RGO hybrid reinforcement on the surface of aluminum powder, and then spark plasma sintering system (SPS) and rolling process were used to prepare CNT-RGO/Al composites. The CNT and RGO enhanced phase distribution, interface microstructure, grain morphology and mechanical properties were studied by EBSD, SEM, TEM and stretching, and the collaborative reinforcement mechanism of CNT and RGO in the CNT-RGO/Al composite was investigated. The results show that the CNT-RGO/Al composite exhibits excellent mechanical properties. The yield strength and tensile strength are 228 MPa and 268 MPa, respectively, which are higher than those of pure aluminum. The yield strength and tensile strength of CNT-RGO/Al composite increase by 153% and 143%, respectively compared with those of pure aluminum, and the elongation of CNT-RGO/Al composite still remains 8.5%. The addition of graphene in the composite not only causes the one-dimensional CNT and the two-dimensional RGO to form a bridge structure, which effectively refines the grains, and is beneficial to the transfer of load, but also promotes the interfacial reaction between C and Al, which is beneficial to bonding. C-Al interface of the material. The synergistic strengthening effect of CNT-RGO hybrid reinforcement is better than that of simple one-dimensional CNT.
Key words:
