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将在坩埚中熔融的Al-Cu合金在冷却凝固的过程中加入旋转磁场和脉冲电流的交互场,研究Al-(4～5%)Cu合金在复合场作用下的微观组织的变化.结果发现旋转磁场和脉冲电流的交互场对合金的凝固组织产生明显的细化作用.从组织细化效果来看,存在一个最佳的电磁参数配匹,100V磁场-100A-300Hz-100μs的电脉冲使粗大的树枝晶破碎,凝固组织呈非树枝晶组织,呈现柱状晶和近等轴晶颗粒,晶间距也明显减小,而且分布较均匀,细化通道组织排列有序.而过大脉宽有使组织孕育长大的作用.文章从交互场产生电磁超声波的角度探讨复合场对金属凝固的影响机理.
In the process of cooling and solidification, Al-Cu alloy melted in the crucible was added into the interaction field of rotating magnetic field and pulsed current to study the microstructure changes of Al- (4-5%) Cu alloy under the action of composite field. The interaction field of rotating magnetic field and pulse current has obvious refining effect on the solidified microstructure of the alloy.From the effect of microstructure refinement, there exists an optimal electromagnetic parameter matching, 100V magnetic field-100A-300Hz-100μs electrical pulse The coarse dendrite crushed, the solidified tissue showed non-dendritic structure with columnar crystals and near-equiaxed grains, and the spacing of crystal grains was also obviously reduced, and the distribution was more uniform and the arrangement of refined channels was orderly. So that the organization bred and grow the role of the article from the interactive field to produce electromagnetic ultrasonic angle of the complex field on the mechanism of metal solidification.