在空气气氛下,采用无压浸渗法制备高体积分数(65%)碳化硅颗粒增强铝基复合材料(SiCp/Al).探究铝镁合金基体中Mg含量对SiCp/Al复合材料微观结构的影响.XRD和SEM被用作复合材料微观组织及断口形貌分析.结果表明:当基体中Mg含量低于6wt%时,复合材料出现明显的分层现象.Mg含量达到8wt%后,分层消失,材料内部出现不完全浸渗区域.随着基体中Mg含量不断增加,不完全浸渗区域逐渐消失,Mg含量达到14wt%后,SiC预制体可完全被合金基体浸渗,复合材料内部结构均匀.这可能是与Mg相关的界面反应促进了自发浸渗.
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