SiC_p/A357复合材料流动性数值模拟与实验研究  

Numerical Simulation and Experimental Study on Fluidity of SiC_p/A357 Composites

作　　者：张桢林 张志峰[1] 徐骏[1] 王亚宝[1] 毛卫民[2] Zhang Zhenlin;Zhang Zhifeng;Xu Jun;Wang Yabao;Mao Weimin(General Research Institute for Non-Ferrous Metals,Beijing 100088,China;University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京有色金属研究总院,北京100088 [2]北京科技大学,北京100083

出　　处：《稀有金属材料与工程》2018年第11期3414-3419,共6页Rare Metal Materials and Engineering

基　　金：国家国际科技合作计划(2015DFA51230);国家高技术研究发展计划("863"计划)(2013AA030701)

摘　　要：搅拌铸造方法易于成型大尺寸复杂的复合材料零件,但是碳化硅颗粒加入使得复合材料的流动行为变得更加复杂,开展复合材料流动性研究至关重要。建立了SiC_p/A357复合材料的流动模型,采用数值模拟及实验研究相结合的方法,研究了浇注温度及碳化硅体积分数对SiC_p/A357复合材料流动性及流动充型过程碳化硅分布的影响。结果表明,随着浇注温度的提高SiC_p/A357复合材料的流动性提高,这一趋势在半固态区间更为明显;但是随着浇注温度的升高,试样前端的碳化硅体积分数较末端减少加剧,复合材料中碳化硅的整体分布均匀性降低;随着碳化硅体积分数的增加,SiC_p/A357复合材料的流动性降低,且随着碳化硅体积分数的增加,试样前端碳化硅的体积分数减少程度减弱,整体的均匀性提高。上述的模拟结果与实验结果具有较好的一致性。Stir casting process is well suitable for large scale and complex composite components,but the flow behavior becomes complicated due to the addition of SiC particles;therefore the mould filling process is of great significance for preparing high quality composite castings.In this study,a flow model of SiCp/A357 composites was built through a numerical method,and the influences of the pouring temperature and SiC volume fraction on the fluidity and SiC particle distribution were studied by fluidity test.The results show that the fluidity of SiCp/A357 composites increases with the increase in pouring temperature,which is more obvious in the semi-solid range;in the meantime,however,the volume fraction of SiC particles at the flow-front is less than that at the end,resulting in the deceasing whole homogeneity of SiC particles.The fluidity of SiCp/A357 composites decreases with SiC volume fraction increasing,and the reduction in SiCp at flow front slows down,so the homogeneity of SiC volume fraction is improved.The numerical simulation is roughly accord with fluidity test.

关 键 词：SiCp/A357复合材料 搅拌铸造:流动性 数值模拟 

分 类 号：TB333[一般工业技术—材料科学与工程]