(大连理工大学 铸造工程研究中心，大连 116024)
摘 要: 分析比较了电磁搅拌法制备复合材料工艺中3种颗粒加入方式对铸锭宏观组织的影响，提出了在旋转熔体中加入挡板来改进工艺的方法。3种颗粒加入方式中，底部加入法使得颗粒和合金液之间的剪切力最大，强的剪切力有利于混合过程的进行。利用工程计算软件ANSYS模拟了旋转磁场作用下的流场，分析了不同挡板形状、倾斜角度对流场的影响，设计了一种复合挡板，获得了最佳工艺参数。加入挡板能限制旋涡的产生，并在轴向上产生强烈的流动。倾斜角度呈60°时，效果最佳。利用复合挡板和底部加入法，制得了组织致密、颗粒分布均匀的铝/电气石复合材料。
关键字: 电磁搅拌；数值模拟；复合材料；流场
stirring method for composite fabrication
（Research Center of Foundry Engineering，Dalian University of Technology，Dalian 116024，China）
Abstract:Macro-and microstructures of composite made by different particle transport methods and electromagnetic stirring were observed and contrasted， and t he effect of different baffle shape and obliquity was studied by simulating the flow field of electromagnetic stirring on the basis of ANSYS. As a result，anewkind of technique to reform the flow field was presented. Among three particle adding methods， bottom-adding method is the most efficient，strong shearing force between particles and alloy melt is beneficial to the mixed process. The use of baffle can restrain the vortex and can result in a strong axial flow. While the inclined angle is 60°，the most efficient results are yielded. A new composite baffle was designed and the optimum technology parameters were given. As a result，the aluminum matrix/TM particulate composite with compact structures and well-proportioned grains was fabricated by composite baffle and the bottom adding method.
Key words: electromagnetic stirring; numerical simulation; composite; flow field
