利用低频电磁铸造工艺制备了具有细小、均匀等轴晶组织的7050铝合金铸锭, 研究了均匀化处理过程中铸锭微观组织及性能的变化. 结果表明, 与普通DC铸造锭坯相比, 低频电磁铸造铸锭有更佳的均匀化处理效果. 在同样的均匀化处理条件下, 低频电磁铸造铸锭的晶间低熔点相含量更低, 晶内溶质元素含量更高. 低频电磁铸造铸锭在均匀化处理12 h后, 晶内溶质元素含量即已达到合金的平均含量;而普通铸锭在均匀化处理48 h后, 晶内溶质元素含量仍低于合金的平均含量.
The 7050 aluminum alloy ingot with fine microstructure was cast by low frequency electromagnetic casting (LFEC) process. The homogenization treatment behaviors of LFEC ingot were investigated experimentally. The results show that the ingots cast with low frequency electromagnetic field has a better homogenization effect than conventional DC ingot. Under the same homogenization condition, the LFEC ingot has fewer low melting point phase between grains and more solute elements inside grains. After homogenized for 12 hours the LFEC ingots can reach the average percentage of the alloy elements, but the DC ingots haven’t reach it until for 48 hours.
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