(1. 江西理工大學 機電工程學院，贛州341000；
2. 江西理工大學 材料科學與工程學院，贛州341000)
摘 要: 采用自制變頻控制的電磁攪拌裝置制備半固態(tài)ZL203鋁合金漿料，分析不同攪拌時間和攪拌頻率下初生α相的形貌和尺寸，研究在連續(xù)攪拌過程中變換頻率對合金熔體進行分級攪拌的影響。結(jié)果表明：分級攪拌可以有效地改善半固態(tài)合金漿料的質(zhì)量；適合于半固態(tài)ZL203合金的分級電磁攪拌工藝如下：ZL203合金經(jīng)670 ℃澆注后，先在40 Hz的頻率下攪拌5 s，再在30 Hz的頻率下攪拌10 s，并于620 ℃溫度下保溫5 min。經(jīng)此工藝制備的半固態(tài)ZL203合金鑄錠具有較好質(zhì)量：其中心部區(qū)域晶粒平均等積圓直徑為85.62 μm，平均形狀因子為0.86；邊緣區(qū)域晶粒的平均等積圓直徑為84.52 μm，平均形狀因子達到0.85。
關(guān)鍵字: ZL203鋁合金；半固態(tài)；分級攪拌；Lorenz力
（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:The semisolid ZL203 alloy slurry was prepared by a self-made electromagnetic stirring unit with frequency conversion. The morphology and size of primary α(Al) phase were analyzed under different stirring times and frequencies, and the effect of stepped stirring on the melt was researched by changing the frequency during continuous stirring. The results indicate that the quality of semisolid alloy slurry is effectively improved by stepped stirring, and the suitable technology of stepped stirring for semisolid ZL203 alloy is obtained as follows: ZL203 alloy poured at 670 ℃, and stirred at 40 Hz for 5 s, then at 30 Hz for 10 s, and isothermally held at 620 ℃ for 5 min, finally. The quality of semisolid ZL203 alloy ingot is relatively high, in which the average equal-area-circle grain diameter and average morphology factor of primary α phase at the central and edge position are 85.62, 84.52 μm and 0.86, 0.85, respectively.
Key words: ZL203 alloy; semisolid; stepped stirring; Lorenz force
