选用0.3 μm的Al2O3颗粒,制备了体积分数为30%的Al2O3P/2024Al复合材料.利用硬度测试,DSC测试,透射电镜等手段研究了亚微米Al2O3P/2024Al复合材料在160℃,175℃和190℃ 3种温度下的时效硬化行为.结果表明:亚微米Al2O3颗粒的加入使复合材料的硬度显著提高,但时效前后复合材料硬度提高的幅度较基体合金低得多.利用DSC和TEM对时效过程的综合分析表明,亚微米Al2O3颗粒的加入抑制了GP区的形成,提高了S'相的热扩散激活能,使S'相析出困难.表现为复合材料析出相的数量较少、尺寸较小.
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