(大連理工大學 鑄造工程研究中心，大連 116024)
摘 要: 分析比較了電磁攪拌法制備復合材料工藝中3種顆粒加入方式對鑄錠宏觀組織的影響，提出了在旋轉熔體中加入擋板來改進工藝的方法。3種顆粒加入方式中，底部加入法使得顆粒和合金液之間的剪切力最大，強的剪切力有利于混合過程的進行。利用工程計算軟件ANSYS模擬了旋轉磁場作用下的流場，分析了不同擋板形狀、傾斜角度對流場的影響，設計了一種復合擋板，獲得了最佳工藝參數(shù)。加入擋板能限制旋渦的產(chǎn)生，并在軸向上產(chǎn)生強烈的流動。傾斜角度呈60°時，效果最佳。利用復合擋板和底部加入法，制得了組織致密、顆粒分布均勻的鋁/電氣石復合材料。
關鍵字: 電磁攪拌；數(shù)值模擬；復合材料；流場
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
