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采用球磨加搅拌铸造工艺制备了CNTs(质量分数为0.1%)增强的AZ91D镁基复合材料。通过光学显微镜、X射线衍射仪、傅里叶红外光谱仪、扫描电子显微镜、透射电子显微镜和室温拉伸试验对复合材料进行表征和分析。结果表明:碳纳米管在镁基体中分散很均匀,并且复合在基体中的碳纳米管结构较完整。与AZ91D基体相比,复合材料屈服强度和伸长率分别提高了47.2%和112.2%。碳纳米管在基体中的均匀分散且与基体形成的强界面结合使复合材料屈服强度和伸长率同时得到了提升。此外,晶粒细化和基体中均匀分散的β相(Mg_(17)Al_(12))也有助于复合材料力学性能的提高。
The AZ91D magnesium matrix composites reinforced by CNTs (mass fraction of 0.1%) were prepared by ball milling and stirring casting process. The composites were characterized and analyzed by optical microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and tensile testing at room temperature. The results show that carbon nanotubes are uniformly dispersed in the magnesium matrix and the carbon nanotubes compounded in the matrix are relatively intact. Compared with the AZ91D matrix, the yield strength and elongation of the composites increased by 47.2% and 112.2% respectively. The uniform dispersion of the carbon nanotubes in the matrix and the strong interface formed with the matrix enhance the yield strength and the elongation of the composite simultaneously. In addition, the grain refinement and homogeneously dispersed β phase (Mg_ (17) Al_ (12)) in the matrix also contribute to the improvement of the mechanical properties of the composites.