对粉末冶金法制备的20%SiCp/2009Al(体积分数)复合材料进行了一次挤压和二次挤压,对2种挤压棒材微观结构的观察表明,相对于热压复合材料,挤压可以减少SiCp团聚;而二次挤压可进一步细化SiCp,使SiCp沿挤压方向定向分布,增大SiCp的长径比,但对基体合金晶粒尺寸和(111)织构影响不大.此外,二次挤压使SiCp沿挤压方向的平均间距进一步增大,更易于产生近似垂直于挤压方向的贫SiCp层,导致复合材料屈服和抗拉强度下降而延伸率增加.
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