采用粉末冶金法制备SiCp/2009Al复合材料热压锭, 并对热压锭进行了热挤压,分析了热压态和挤压态复合材料的相组成和元素分布. 结果表明: 热压锭存在轻微的元素偏析, 下部Cu和Mg含量略高于上部. 热压态复合材料组成相主要为Al, SiC, Al2Cu和Mg2Si, 另外还含有少量的Al7Cu2Fe和Mg的氧化物. 经固溶处理后, Al2Cu和Mg2Si溶解, Cu在基体中均匀分布, 但Mg仍偏聚于原始铝颗粒边界和SiC团聚处. 挤压变形不改变复合材料的相组成, 但使SiC分布更均匀并破碎了铝颗粒表面的氧化膜.挤压态复合材料经固溶处理后, Cu和Mg均在基体中均实现了均匀分布.
SiCp/2009Al composites were fabricated through powder metallurgy and subsequent extrusion. The phases and elemental distributions in the hot pressed and extruded composites were studied. The slight macro–segregation was found in the hot pressed composite billet. The concentrations of Cu and Mg in the bottom of the billet are somewhat higher than those in the top of the billet. The hot pressed composite contains Al, SiC, Al2Cu, Mg2Si and a small quantity of Al7Cu2Fe and oxide of Mg. After solid solution treatment, Al2Cu and Mg2Si dissolved into the matrix and Cu was distributed uniformly in the matrix. However, Mg was still preferentially distributed near the boundaries of the Al particles and in the clusters of SiC. No change of the phases types in the composites was found, however, the extrusion resulted in uniformly distribution of the SiC particles and broke up the oxide shell of the initial Al particles, thus Cu and Mg were distributed homogeneously in the extruded composites after solid solution treatment.
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