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.
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