碳纳米管／ZM5镁合金复合材料的制备与力学性能研究

Fabrication and Mechanical Properties of Carbon Nanotubes ZM5 Composites

采用搅拌铸造法制备了碳纳米管／ZM5镁合金复合材料,研究了搅拌法加入碳纳米管的工艺特点,测试了复合材料的力学性能,并利用扫描电子显微镜和能谱分析对复合材料断口形貌进行了观察和分析。研究结果表明:当搅拌温度接近于ZM5镁合金液相线温度时,碳纳米管能较好的加入到镁合金熔体中。与基体合金相比,复合材料的抗拉强度、弹性模量、显微硬度显著增加,伸长率最大可提高110％,但是碳纳米管加入量过多会导致偏聚,使力学性能下降,碳纳米管能细化复合材料的晶粒组织,并且起搭接晶粒和承载变形抗力的作用。

Carbon nanotubes （CNTs）/ZM5 composites were fabricated by stirring casting method and the stirring technology was studied. The mechanical properties of the composites were tested, and the fractographs were observed and analyzed through scanning electron microscope and energy spectrum analysis. The results show that CNTs can be added into the Mg molten alloy by stirring at the liquidus temperature of ZM5 alloy. Compared with the matrix alloy, the tensile strength, the elastic modulus, and the microhardness of the composites increase significantly. Meanwhile, the elongation can be enhanced by 110%. However, the mechanical properties decrease with excess addition of CNTs due to the conglomeration. CNTs can not only refine the grains of the composites, but also overlape the grains and bear the load of resistance to deformation.