铸型材质对SiC_p/ZAlSi5CuMg微观组织均匀性影响规律的研究  

Study on Influence of Mold Materials on Microstructure Uniformity of SiC_p/ ZAlSi5CuMg Matrix Composites

作　　者：刘向东[1] 车广东[1] 李勇[2] 闫淑芳[1] 刘小华[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051 [2]呼和浩特铁路局集宁工务段铸造厂,内蒙古集宁012000

出　　处：《铸造技术》2007年第2期195-198,共4页Foundry Technology

基　　金：内蒙古自然科学基金资助项目;项目编号:No.200508010707

摘　　要：铸型材质不同,其冷却速度不同,它影响液态金属凝固过程及形成的组织,进而影响材料的性能。用铸造法制备复合材料时,铸型材质还会对增强体颗粒的分布产生影响。采用液态搅拌法制备了SiCp/ZAlSi5CuMg复合材料,研究了不同铸型材质、相同材质不同壁厚对SiCp/Al复合材料微观组织均匀性的影响规律。试验结果表明,在其他条件相同的情况下,采用冷却能力较快的铸型,可以明显改善SiC颗粒在ZAlSi5CuMg基体中分布的均匀性。冷却速度较快,凝固过程中金属液粘度迅速增大,使SiC颗粒聚集及下降时的阻力增大,难以聚集或下降,进而使SiC颗粒在ZAlSi5CuMg基体中分布的均匀性得到改善。SiCp/ZAISi5CuMg composites was fabricated by melt stirring casting and the influence of cooling velocity of mold on its microstructure was investigated. The result shows that with cooling velocity increasing, the uniformity of SiC particles distribution in AI alloy matrix are obviously improved under otherwise identical conditions. The viscosity of melt increased quickly in solidification process as rate of melt solidification increasing so that SiC particles were difficult to sink and settle because of resistance increasing. These effects caused the uniformity of SiC particles distribution in the alloy ZAISi5CuMg matrix improved obviously.

关 键 词：SICP/AL复合材料 颗粒分布 微观组织均匀性 

分 类 号：TG113[金属学及工艺—物理冶金]