(1. 北京航空航天大學(xué)機(jī)械工程及自動(dòng)化學(xué)院，北京 100191；
2. 中國(guó)工程物理研究院化工材料研究所，綿陽(yáng)621900)
摘 要: 采用熱等靜壓(HIP)工藝制備連續(xù)碳纖維(CF)增強(qiáng)Al基復(fù)合材料。利用掃描電鏡、粒度儀和X射線衍射儀表征2A12鋁合金粉末形貌、粒度分布和相組成；利用光學(xué)顯微鏡、掃描電鏡和能譜儀觀察復(fù)合材料的顯微組織、斷口形貌和界面擴(kuò)散反應(yīng)特征，并對(duì)其主要力學(xué)性能進(jìn)行測(cè)試。結(jié)果表明：粉末形貌呈球形，粒度主要分布在150~180μm；復(fù)合材料致密，界面連接緊密無(wú)孔洞缺陷；與基體鋁合金材料相比，復(fù)合材料的拉伸強(qiáng)度和斷后伸長(zhǎng)率分別提高5%和54%，斷裂方式為脆性斷裂；Al基體裂紋起源于粉末顆粒界面，CF/Al界面斷口呈現(xiàn)CF拔出和斷裂失效形式；CF/Al界面發(fā)生元素?cái)U(kuò)散，界面反應(yīng)生成Al4C3金屬間化合物。
關(guān)鍵字: CF/Al復(fù)合材料；熱等靜壓；失效形式；界面反應(yīng)
（1. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China;
2. Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China）
Abstract:Aluminum matrix composite reinforced with continuous carbon fiber (CF) was manufactured by hot isostatic pressing (HIP). The morphology, grain size distribution and phase of the powders were investigated by scanning electron microscope (SEM), particle analyzer and X-ray diffraction (XRD). The microstructure, fracture surface morphologies and CF/Al interface reaction characteristic were observed by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The mechanical properties of the composites were also tested. The results indicate that, the powders are nearly spherical, the particle size is mainly 150-180μm; the compositesare compact and the interface bonding is tight without porosity defect; compared with the aluminum matrix alloy, the tensile strength and elongation of the composites increase by above 5% and 54%, respectively, and the fracture mechanism is brittle fracture; the fracture of the Al matrix is along the powder interface, carbon fibers are pulled out and fractured in the CF/Al interface zone; the interface of the CF/Al appears element diffusion, and the interfacial reaction product is Al4C3 intermetallic compound.
Key words: CF/Al composite; hot isostatic pressing; failure mode; interfacial reaction
