采用接触反应法制备了原位TiC/Al-4.5Cu复合材料,借助光学显微镜、透射电子显微镜研究了向基体合金中添加不同含量的Mg对复合材料微观组织和拉伸性能的影响.结果表明:随着Mg的添加量由0.8％(质量分数,下同)增加到2.0％,TiC/Al-4.5Cu复合材料的延伸率下降,而抗拉强度在1.5％Mg时,达到极值.与同等条件下制备的不含Mg的TiC/Al-4.5Cu复合材料相比,抗拉强度提高了17.7％,但延伸率下降了17.9％.TiC颗粒的细化有助于复合材料力学性能的提高,但针状Al2CuMg相的析出阻碍了复合材料塑性的进一步提高.TiC/Al-4.5Cu-Mg复合材料中TiC颗粒尺寸为100 nm左右.
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