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基于改进的自制Bridgman水平卧式定向凝固装置,研究了横向直流稳恒磁场对Zn-35Al-2.5Cu-1.5Ti合金显微组织的影响。通过金相显微组织观察、显微组织定量表征等方式,分析了磁场对锌合金显微组织的影响规律。结果表明,随着磁感应强度增加,因磁场存在而产生的热电磁流体动力学(TEMHD)效应增强,促进液-固界面糊状区熔体流动,有利于原子扩散迁移,显微组织粗化;牵引速度增加,TEMHD效应减弱,凝固组织细化。当磁感应强度为0.2T,定向凝固牵引速率为30μm/s时,锌合金显微组织粗化严重。施加磁场与未施加磁场的合金显微组织相比,其一次臂、二次臂间距增加最大幅度可达44.9%和52.2%。
Based on the improved Bridgman horizontal horizontal directional solidification device, the effect of transverse DC steady magnetic field on the microstructure of Zn-35Al-2.5Cu-1.5Ti alloy was studied. The effects of magnetic field on the microstructure of zinc alloy were analyzed by metallographic microstructure observation and microstructure quantitative characterization. The results show that with the increase of the magnetic flux density, the thermodynamics of hydrodynamics (TEMHD) due to the presence of a magnetic field increases, which promotes the melt flow in the mushy region of the liquid - solid interface, which is favorable for atom diffusion and migration and microstructure coarsening. Traction speed increased, TEMHD effect weakened, solidified tissue refinement. When the magnetic induction intensity is 0.2T and the directional solidification and traction rate is 30μm / s, the microstructure of zinc alloy is coarsened. Compared with the microstructure of the alloy without magnetic field, the maximum amplitude of the distance between the primary arm and the secondary arm can reach 44.9% and 52.2%, respectively.