(1. 江西理工大學(xué) 機電工程學(xué)院，贛州 341000；
2. 江西理工大學(xué) 材料科學(xué)與工程學(xué)院，贛州 341000)
摘 要: 運用ANSYS有限元分析軟件對半固態(tài)A356鋁合金凝固過程中的流場進(jìn)行模擬，研究電磁攪拌參數(shù)(電磁頻率和電流強度)對合金熔體流動與凝固組織的影響。結(jié)果表明：隨著電磁頻率和電流強度的增大，半固態(tài)鋁合金在橢圓坩堝長軸X和短軸Y上的最大電磁力和最大流速均呈現(xiàn)出先增大后減小的趨勢，并且長軸X上的最大電磁力和最大流速均大于短軸Y上的；施加電磁攪拌后，電磁力從坩堝的中心處沿半徑方向逐步增大，到0.8~0.9倍的坩堝半徑處電磁力達(dá)到最大，超過該距離后，電磁力又開始急劇降低。橢圓坩堝中電磁力受電流強度的影響更大，而流速受電流強度和電磁頻率的敏感度不如電磁力，但電流強度對流速的影響依舊略強于電磁頻率；當(dāng)電磁頻率和電流強度分別為30 Hz和5 A時，半固態(tài)A356合金初生相的平均等積圓直徑為106.1 μm，平均形狀因子為0.72，此時制備出的半固態(tài)合金組織最好。
關(guān)鍵字: 半固態(tài)鋁合金；電磁攪拌；電磁頻率；電流強度；橢圓坩堝
（1. School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:ANSYS finite element analysis software was used to simulate the flow field in the solidification process of semi-solid aluminum alloy A356, and the effects of electromagnetic stirring parameters, such as electromagnetic frequency and current intensity, on the flow field were studied. The results show that, with the increase of electromagnetic frequency and current intensity, the maximum electromagnetic force and maximum flow velocity of semi-solid aluminum alloy on the long axis X and the short axis Y of oval crucible show a tendency to increase first and then decrease, and the maximum on the long axis X. After the electromagnetic stirring is applied, the electromagnetic force gradually increases from the center of the crucible in the radial direction, it reaches the maximum at the radius of 0.8-0.9 time and starts to decrease sharply beyond the distance. The electromagnetic force is more affected by the current intensity and the flow rate is less sensitive to the current intensity and electromagnetic frequency than the electromagnetic force, but the influence of the current intensity on the flow rate is still slightly stronger than the electromagnetic frequency in oval crucible. When the electromagnetic frequency and current intensity are 30 Hz and 5 A, the average equal-area circular diameter of the primary phase in semi-solid A356 alloy reaches 106.1 μm, and the average shape factor increases to 0.72, the best microstructure of the semi-solid alloy can be obtained in this condition.
Key words: semisolid aluminum alloy; electromagnetic stirring; electromagnetic frequency; current intensity; oval crucible
