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采用机械搅拌与高能超声复合分散法制备了碳纳米管增强CNTs/AZ91D镁基纳米复合材料。利用金相显微镜、扫描电镜、拉伸试验等手段观察和测试了复合材料的微观组织与力学性能,并利用扫描电镜和能谱分析对复合材料断口形貌、成分进行了观察和分析。结果表明,半固态机械搅拌与高能超声处理能使碳纳米管较好地加入且均匀分散到AZ91D镁合金基体中。CNTs加入量在0~1.0%范围内,随着CNTs加入量的增加,复合材料的强度和塑性同时得到了提高。CNTs含量为1.0%的AZ91D镁基复合材料铸态的抗拉强度、屈服强度、伸长率分别达到200 MPa、114 MPa、5.4%,与基体合金相比,分别提高了51.5%、42.5%、170%,碳纳米管主要起到细化晶粒和承受变形载荷的作用。
Carbon nanotubes reinforced CNTs / AZ91D magnesium-based nanocomposites were prepared by mechanical stirring and high-energy ultrasonic dispersion. The microstructure and mechanical properties of the composites were observed and measured by optical microscopy, scanning electron microscopy and tensile test. The fracture morphology and composition of the composites were observed and analyzed by SEM and EDS. The results show that semi-solid mechanical stirring and high-energy ultrasonic treatment can make carbon nanotubes well and uniformly dispersed into the AZ91D magnesium alloy matrix. The addition of CNTs is in the range of 0-1.0%. With the increase of the amount of CNTs, the strength and ductility of the composites increase at the same time. The tensile strength, yield strength and elongation of AZ91D magnesium matrix composites with CNTs content of 1.0% were as high as 200 MPa, 114 MPa and 5.4%, respectively, which were 51.5% and 42.5% higher than that of the matrix alloy respectively. 170%, carbon nanotubes mainly play the role of grain refinement and deformation load.