电磁搅拌Al-24%Si合金的显微组织  

Microstructures of hypereutectic Al-24%Si alloy stirred by electromagnetic field

作　　者：毛卫民[1] 李树索[1] 赵爱民[1] 崔成林[1] 王德仁[1] 钟雪友[1] 

机构地区：[1]北京科技大学铸造研究所,北京100083

出　　处：《中国有色金属学报》2001年第5期819-823,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目 ( 5 97710 11)

摘　　要：在常规凝固条件下 ,Al 2 4%Si过共晶合金中的初生Si为粗大的板片状。经过激烈的电磁搅拌 ,初生Si得到明显细化 ,分布均匀 ,绝大部分初生Si呈球团状或块状 ;搅拌功率越大 ,初生Si越细小和圆整 ;P变质可以强化电磁搅拌效果。在电磁搅拌条件下 ,Al 2 4%Si过共晶合金中的初生Si得以细化和球团化的主要原因是 :电磁搅拌引起合金熔体对初生Si的机械破碎、摩擦作用、抑制初生Si择优生长作用。The primary silicon phases of hypereutectic Al 24%Si alloy will be solidified into large plate on traditional condition. The primary silicon phases, however, are fined greatly and distributed homogeneously, and most of them are in nodular or polygonal shape when the alloy melt solidifying is stirred violently by electromagnetic field. The larger the stirring power, the finer and rounder the primary silicon crystals. The stirring effect can be strengthened by the modification of phosphorus. The strong melt flow induced by stirring brings mechanical breaking to the primary silicon crystals and wearing among the primary silicon crystals or between the primary silicon crystals and the liquid promotes the primary silicon crystal ripening, inhibits the anisotropic growth and phosphorus agent gives modification to the primary silicon crystals.

关 键 词：电磁搅拌 过共晶铝硅合金 显微组织 

分 类 号：TG146.21[一般工业技术—材料科学与工程]