采用热压法制备添加0～6％铜含量(质量分数)的Al-50％Sip(质量分数)复合材料,研究Cu含量对复合材料显微组织和力学性能的影响,对混合粉末进行差示扫描量热分析(DSC),采用扫描电镜(SEM)和X射线衍射仪(XRD)研究试样的显微组织和相组成,并测试复合材料的拉伸和抗弯性能.结果表明:单质Cu粉的加入降低混合粉末的熔点,有利于在相对较低的温度下实现材料的致密化.当Cu含量低于2％时,材料的组织均匀致密,Si颗粒未出现明显粗化;但当Cu含量高于2％时,组织均匀性随Cu含量的增加而逐渐下降;随着Cu含量增加,复合材料的抗拉强度和抗弯强度呈先上升后下降的趋势;在Cu含量为2％时,复合材料的抗拉强度和抗弯强度分别达到最大值(268和423 MPa),较未添加Cu的复合材料分别提高66.5％和46.9％,材料的弹性模量和布氏硬度随Cu含量的增加逐渐上升.
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