(上海大学材料科学与工程学院，上海 200072)
摘 要: 研究了电磁搅拌对ZL101A铝合金显微组织的影响，阐明了不同搅拌工艺条件下ZL101A铝合金的显微组织的变化规律。结果表明：在磁场强度大于0.065 T的EMS作用下，ZL101A合金能够得到非树枝晶组织；未经细化处理，晶粒尺寸在100～300 μm范围内；随着EMS作用的增强，晶粒向完全椭球形发展；本实验条件下EMS没有细化共晶Si的作用，也没有改变共晶Si的析出形态；搅拌作用与合金凝固速度的良好匹配是得到理想非树枝晶组织的关键。
关键字: 电磁搅拌 铝合金 显微组织
（School of Materials Science and Engineering, Shanghai University, Shanghai 200072, P. R. China）
Abstract:The influence of electromagnetic stirring process on the ZL101A aluminum alloy microstructure was studied. The changing regularity of ZL101A alloy microstructure was revealed under different electromagnetic stirring conditions. It showed that when the magnetic field intensity is greater than 0.065 T, the nondendritic and spheroidal microstructure can be obtained in Z L101A alloy; without refinement treatment, the grain size ranges from 100 to 300 μm; as the EMS effect increases, the nondendritic structure evolves towards more spheroid; under the experiment conditions, EMS has no refinement effect on eutectic Si, and can not change its separation form. The results also showed that the EMS effect, solidification rate and their matching are the key to obtaining the ideal nondendritic structure.
Key words: electromagnetic stirring; aluminum alloy; microstructure
