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针对重力铸造的汽车活塞用单一SiC颗粒增强铝基复合材料拉伸性能会降低的问题,采用混合盐原位反应的方法制备出综合力学性能较好的TiB2、SiC双相颗粒增强的ZL101复合材料。利用扫描电镜对复合材料的微观组织进行观察,基体上TiB2颗粒与SiC颗粒分布比较均匀;利用拉伸试验机和硬度计对复合材料的室温力学性能进行了测试。结果表明:TiB2、SiC两相颗粒增强的ZL101基复合材料的硬度明显比单一颗粒增强复合材料提高,较基体合金ZL101硬度提高了16.9%,且制备的该复合材料比单一SiC颗粒拉伸强度略有提高。
In view of the problem that the tensile properties of the single-piece SiC particle reinforced aluminum matrix composite for gravity casting automobile pistons will be reduced, the ZL101 composite material reinforced by TiB2 and SiC with better comprehensive mechanical properties is prepared by in situ mixed salt reaction . The microstructure of the composites was observed by scanning electron microscopy. The distribution of TiB2 particles and SiC particles on the matrix was uniform. The mechanical properties at room temperature of the composites were tested by tensile tester and hardness tester. The results show that the hardness of ZL101 matrix composites reinforced by TiB2 and SiC particles is obviously higher than that of single particle reinforced composites, which is 16.9% higher than that of matrix alloy ZL101. The tensile strength of this composite material is slightly higher than that of single SiC particles Improve.