电磁复合场对Zn-10 wt%Bi过偏晶合金凝固组织的影响

The effect of electromagnetic compound field on the solidified microstructure of Zn-10 wt%Bi hyper-monotectic alloy

以Zn-10 wt%Bi的过偏晶合金作为研究对象,在强磁场条件下,考察了不同电磁体积力对其显微凝固组织与凝固过程的影响.实验结果表明,在一定的强静磁场下,当交变电流增加到某一特定值时(交变电流频率为50 Hz),得到的凝固组织最为均匀,第二相颗粒直径也达到最小;在固定交变电流值的条件下(交变电流频率为50Hz),Zn-10 wt%Bi合金的凝固组织随着磁感应强度的增加,其偏析程度、弥散程度和第二相Bi颗粒的大小都有明显的改善.实验分析结果表明,磁场复合交变电流产生的电磁体积力的大小,对合金凝固组织都有显著影响,通过控制磁感应强度和交变电流大小,从而获得较为理想的过偏晶合金凝固组织.

The effects of different electro-magnetic body forces on the microstructure and solidifying process of Zn-10 wt%Bi hyper- monotectic alloy under the condition of high magnetic field are investigated in this paper. The result indicate, on the one hand, that the solidified structure is wanted most and the diameter of the second phase particle is minimum when the alternative current （50 Hz） increases to a certain value. On the other hand, the degree of segregation, dispersion and size of the second Bi phase particles in solidi- fied structure of Zn-10 wt%Bi hyper-monotectic alloy are refined significantly with the increase of magnetic induction intensity under a fixed alternative current （50 Hz） value. The analysis result indicates that both the magnetic induction intensity and alternative current intensity have a significant effect on solidified structure so that we can obtain a more competitive solidified structure of monotectic alloy by controlling the intensity of magnetic induction and alternative current.