真空压力浸渗制备车板用CF/A365铝合金组织和力学性能分析  

Fabrication and Characterization of Carbon Fiber Reinforced A365 Alloy Composite

作　　者：尹冠飞[1] 宋东方[1] 李联辉 Yin Guanfei;Song Dongfang;Li Lianhui(College of Automotive Engineering,Henan Vocational and Technical College,Zhengzhou 450046,China;College of Accounting and Mechanical Engineering,North University for Nationalities,Yinchuan 750000,China)

机构地区：[1]河南职业技术学院汽车工程学院,郑州450046 [2]北方民族大学机电工程学院,银川750000

出　　处：《真空科学与技术学报》2020年第8期724-728,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：选择A365铝合金作为基底材料,采用真空压力浸渗方式通过M40J碳纤维(CF)对其进行加强,实验测试的方式分析了不同CF含量下A365铝合金的界面结构及其力学强度的变化。研究结果表明:密度最高的是5%CF的A365铝合金,达到了高比强度的力学特性。所有不同CF含量纤维增强基底都获得了高于98%的致密度,获试样中密度最大的是5%CF的A365铝合金。经过高温浸渗处理后,SiC纤维接触到界面区域的铝液后会发生以下反应,得到Al4C3组织。CF含量5%时,各个纤维束达到了充分浸渗,纤维束间隙也被基底较好填充,此时在Cf/A365铝合金中并没有产生明显界面结构。CF含量5%铝合金的断口区域也形成了凹凸不平的结构,属于韧性断裂,拉伸期间纤维和基底存在脱粘的情况,能够有效发挥纤维增强效果。The carbon-fiber(CF) reinforced A365 alloy composite was fabricated by vacuum pressure infiltration with the preform,comprising the CF wrapped in A365-alloy foil.The influence of the CF-content on the interfacial microstructures and mechanical properties was investigated with X-ray diffraction,scanning electron microscopy and transmission electron microscopy.The results show that the CF-content had a major impact.To be specific,as the CF-content increased to 10%(wt),the density and tensile-strength changed in an increase-decrease mode,maximizing to 3.1 g/cm3 and 2416 MPa at 5%,respectively,with the compactness over 98%. The Al4C3 clusters formed at the interfaces in the infiltration at 750℃,especially when the liquid-Al completely wetted the CF-bundles and filled interfacial gaps at CF-5%.In the CF-5% composite,the observable CF-Al365 interfaces vanished.The rough fractured surfaces,comprising jagged gains,pulled-out CF and dimples,indicated the ductile fracture mechanism.

关 键 词：碳纤维 铝合金 真空压力浸渗 微观组织 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]