利用强磁场控制过共晶铝硅合金的凝固组织  

Control of solidified structures of Al-Si hypereutectic alloy by using intense magnetic fields

作　　者：王强 王春江[2] 庞雪君[2] 赫冀成[2] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,教授沈阳市110004 [2]东北大学

出　　处：《材料研究学报》2004年第6期568-576,共9页Chinese Journal of Materials Research

基　　金：国家自然科学基金50204004国家自然科学基金50374027上海宝钢集团公司以及辽宁省科学技术基金20021010资助项目.

摘　　要：研究了静磁场和梯度磁场的强度和方向对Al-15.7％Si合金宏观和微观凝固组织的影响.结果表明,在不同的磁场条件下,从过共晶合金中析出的初晶硅粒的分布状况和共晶硅的形态和密度有显著不同.通过改变磁感应强度和磁场梯度的大小和方向可有效控制初晶硅的分布;合理控制强磁场的操作参数可达到细化铝硅共晶体的目的.强磁场的磁化力和洛伦兹力通过控制初晶硅颗粒迁移行为来改变其在合金基体中的分布状态,通过影响凝固过程中的对流现象改变合金的凝固组织.The changes of the macro-and micro-solidified structures of Al-15.7%Si hypereutectic alloy were examined under various experimental conditions, and the influences of static and gradient magnetic fields with different amplitude and direction on the structures were investigated. It is found that not only the distribution of the primary crystal silicon but the structures and density of silicon framework of eutectic are different because of different magnetic parameters. The changes of the primary crystals distribution is due to the action of the Lorentz and magnetization forces caused by intense magnetic fields on the migratory behaviors of Si particles in the alloy matrix; and the forces can also change the convection phenomena during solidification to affect the solidified structures of alloy. The results indicate that it is possible to control the behaviors of reinforced particles in the metal matrix by using intense magnetic fields in the solidification process of metal matrix composites.

关 键 词：金属材料 金属基复合材料 强磁场 AL-SI合金 凝固过程 

分 类 号：TB331[一般工业技术—材料科学与工程]