(西南交通大學(xué) 材料科學(xué)與工程學(xué)院，成都 610031)
摘 要: 利用可控溫電磁攪拌器對7A04變形鋁合金進(jìn)行了大體積(制漿室d180 mm，一次制漿量5 kg以上)半固態(tài)流變漿料制備試驗(yàn)，研究電磁攪拌參數(shù)對7A04變形鋁合金半固態(tài)漿料組織及其徑向均勻性的影響。結(jié)果表明：在本試驗(yàn)條件下，制漿室0.5R處的漿料組織優(yōu)于制漿室中心和邊緣的，隨著攪拌頻率的增加，制漿室中半固態(tài)漿料的組織均勻性降低；較高的攪拌電壓和漿料溫度下初生α(Al)組織較細(xì)。攪拌電壓為230 V、熔體溫度為638 ℃、攪拌頻率為5 Hz時(shí)，7A04鋁合金大體積半固態(tài)漿料組織總體質(zhì)量最佳，平均等效直徑為112 μm。
關(guān)鍵字: 7A04鋁合金；半固態(tài)漿料；電磁攪拌；均勻性
（School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China）
Abstract:The effect of the electromagnetic stirring (EMS) process parameters on microstructure and radial homogeneity of large-volume (slurry maker of diameter d180 mm, more than 5kg every time) semi-solid slurry of 7A04 aluminum alloy was studied with temperature-controllable electromagnetic stirrer. The results show that, under the experimental condition, the slurry microstructure at 1/2 radius location of the slurry maker is better than those at the center and the edge. As the frequency increases, the microstructure homogeneity of the semi-solid slurry decreases; the primary α(Al) particles of the semi-solid slurry is finer at higher voltage and slurry temperature. The overall quality of the semi-solid slurry is the best at EMS voltage of 230 V, slurry temperature of 638 ℃ and EMS frequency of 5 Hz, the average equivalent diameter is 112 μm.
Key words: 7A04 aluminum alloy; semi-solid slurry; electromagnetic stirring; homogeneity
