利用粉末冶金法制备了含15%SiC (体积分数)的SiC/Al-7.5Zn-2.8Mg-1.7Cu (质量分数，%)复合材料，采用TEM、EPMA和拉伸等分析测试手段，研究了热压烧结温度(500-560 °C)对复合材料微观组织和力学性能的影响。结果表明，所选热压温度下均可制备致密无孔洞的复合材料坯锭。热压温度为500和520 °C时，SiC/Al界面反应程度较轻，挤压棒材经T6热处理后，Zn元素均匀分布于基体中，但存在的少量富Mg微米级难溶相使复合材料的力学性能产生较大波动。当热压温度升高到540 °C时，富Mg难溶相尺寸明显减小，元素分布变得更均匀，复合材料力学性能稳定性明显提升。当热压温度继续升高到560 °C时，Mg元素开始向SiC颗粒周围偏聚，界面反应更加严重，而且降低了基体中MgZn2的体积分数，使复合材料抗拉强度明显下降。对560 °C热压的复合材料进行高角环形暗场像和EDS分析，发现SiC/Al界面同时存在含Mg氧化物和粗大的MgZn2沉淀相。

Particulate reinforced aluminum matrix composites have been widely used in industrial fields. In general, high strength aluminium alloys, such as 2024Al are employed to produce stronger composites. However, the composites with high strength Al-Zn-Mg-Cu alloys as the matrices are paid relative attentions. Therefore, the corresponding optimization for fabrication parameters has not been well understood. In the present work, SiC particles with volume fraction of 15% reinforced Al-7.5Zn-2.8Mg-1.7Cu (wt.%) composites were fabricated using powder metallurgy (PM) technique at hot pressing temperatures of 500, 520, 540 and 560 °C. TEM, EPMA and tensile test were used to study the effect of hot pressing temperature on the microstructure and tensile properties of SiC/Al-Zn-Mg-Cu composites. The measured densities indicated that all the composites were completely condensed, no pores were discovered. Undissolved phase containing Mg and Cu segregated in matrix of the composites hot pressed at 500 and 520 °C, resulting in instable tensile properties. With increasing hot pressing temperature to 540 °C, Mg and Cu were uniformly distributed in the composites which exhibited the stable tensile properties. With further increasing temperature to 560 °C, Mg segregated around SiC particles due to interface reaction. In this case, the thickness of SiC/Al interface layers increased significantly compared to the other composites, resulting in the reduction of tensile strength. HAADF-STEM and EDS analyses showed that the interface compounds were oxide of Mg and coarse MgZn2 phase.