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采用液相包裹法对Al2O3微粉进行稀土Y2O3表面改性,用挤压铸造法制备表面经稀土Y2O3改性的Al2O3P/6061Al复合材料,并对复合材料的显微组织及拉伸性能进行分析和研究。结果表明:表面经稀土Y2O3改性的Al2O3微粉能均匀的分布于基体中,界面润湿性得以改善,复合材料组织更加均匀。TEM观察表明:改性粉体在制备复合材料前后表面存在颗粒状包裹层。对其表面进行EDAX分析,结果显示含有Y,Al和O元素。粉体XRD图谱中有Y2O3衍射峰的存在。拉伸性能测试表明:改性粉体对Al合金增强效果明显增加,抗拉强度提高29.8%,屈服强度提高38.4%,延伸率提高10.3%。对拉伸断口进行SEM分析,改性后复合材料断口韧窝更加均匀、丰满,材料表现出良好的塑性。
The rare earth Y2O3 surface modification was carried out on the Al2O3 micropowder by liquid coating method. The Al2O3P / 6061Al composite surface modified by rare earth Y2O3 was prepared by extrusion casting method. The microstructure and tensile properties of the composite were analyzed and studied . The results show that the surface of the Al2O3 powder modified by rare earth Y2O3 can be uniformly distributed in the matrix, the interfacial wettability can be improved and the composite structure can be more uniform. The TEM observation shows that the modified powder has granular coating on the surface before and after the preparation of the composite. EDAX analysis of the surface showed that there were Y, Al and O elements. Powder XRD spectrum Y2O3 diffraction peaks exist. Tensile properties tests show that the modified powders have a markedly enhanced effect on Al alloys, with a tensile strength of 29.8%, a yield strength of 38.4% and an elongation of 10.3%. The tensile fracture was analyzed by SEM. The modified composite fracture dimples were more uniform and full, and the material showed good ductility.