【摘要】 Zn-Bi过偏晶合金凝固过程中因液-液分离反应极易造成第二相偏析.磁场在过偏晶合金的凝固过程中具有抑制第二相液滴迁移的作用,在水平稳恒磁场中进行Zn-Bi过偏晶合金的水冷铜模浇铸实验,研究磁场方向与第二相液滴运动方向呈不同夹角时对偏晶合金凝固组织的影响,对不同方向磁场对液滴运动的作用机制进行分析.实验结果表明,水平稳恒磁场对富Bi相的Marangoni运动有一定的抑制作用,且磁场方向与富Bi液滴Marangoni运动方向平行时,磁场的作用效果最明显更多还原

【Abstract】 The second-phase segregation is highly liable to occur in the solidification process of Zn-Bi hypermonotectic alloy,because of the liquid-liquid separation reaction.The magnetic field can suppress the migration of second-phase droplets in the solidification process.An experiment was done for casting the Zn-Bi hypermonotectic alloy into water-cooled copper mould in a horizontal steady magnetic field,to investigate the effect of magnetic field on the solidified structure of the alloy,where the moving direction of second-phase droplets in each part of the sample have a different angle with the magnetic field.The results showed that the magnetic field can suppress the Marangoni motion of Bi-rich phase,and the magnetic field has most obvious effect when its direction is parallel to the Marangoni motion of Bi-rich droplets.更多还原