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将普通碳纳米管、化学包覆镍碳纳米管分别与铝粉按质量比1:5混合球磨后压制成块,采用钟罩将碳纳米管预制块压入铝合金熔体制备CNTs/AlSi7Mg复合材料。测试了复合材料的室温力学性能,通过X射线衍射仪(XRD)、扫描电镜(SEM)和能谱分析仪(EDS)对复合材料及其断口进行观察与分析。结果表明,碳纳米管的加入能细化复合材料的组织,使复合材料的二次枝晶臂间距减小,明显提高复合材料的抗拉强度、硬度和弹性模量。化学包覆镍碳纳米管加入量为1.0%时,T6态复合材料的抗拉强度、硬度(HV)和弹性模量分别达到了306MPa、118和132GPa,比基体提高了33.4%、25.5%和53.9%。复合材料的断口呈准解理型脆性断裂的特征。
Ordinary carbon nanotubes, chemically coated nickel carbon nanotubes and aluminum powder mass ratio of 1: 5 were mixed ball milling block, using a bell jar carbon nanotube preform pressed into the aluminum alloy melt preparation CNTs / AlSi7Mg composite material. The mechanical properties at room temperature of the composites were tested. The composites and their fractures were observed and analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the addition of carbon nanotubes can refine the microstructure of the composites, reduce the secondary dendrite arm spacing of the composites, and significantly improve the tensile strength, hardness and elastic modulus of the composites. Tensile strength, hardness (HV) and elastic modulus of T6 composites reached 306MPa, 118 and 132GPa, respectively, which were 33.4% and 25.5% higher than that of the matrix 53.9%. The fracture of the composites is characterized by brittle fracture.