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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Effect of Multi-Scale Thermoelectric Magnetic Convection on Solidification Microstructure in Directionally Solidified Al-Si Alloys Under a Transverse Magnetic Field
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Effect of Multi-Scale Thermoelectric Magnetic Convection on Solidification Microstructure in Directionally Solidified Al-Si Alloys Under a Transverse Magnetic Field

机译：横向磁场下多尺度热电对流对定向凝固Al-Si合金凝固组织的影响

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摘要

The influence of a transverse magnetic field (B < 1 T) on the solidification structure in directionally solidified Al-Si alloys was investigated. Experimental results indicate that the magnetic field caused macrosegregation, dendrite refinement, and a decrease in the length of the mushy zone in both Al-7 wt pct Si alloy and Al-7 wt pct Si-1 wt pct Fe alloys. Moreover, the application of the magnetic field is capable of separating the Fe-rich intermetallic phases from Al-7 wt pct Si-1 wt pct Fe alloy. Thermoelectric magnetic convection (TEMC) was numerically simulated during the directional solidification of Al-Si alloys. The results reveal that the TEMC increases to a maximum () when the magnetic field reaches a critical magnetic field strength (), and then decreases as the magnetic field strength increases further. The TEMC exhibits the multi-scales effects: the and values are different at various scales, with decreasing and increasing as the scale decreases. The modification of the solidification structure under the magnetic field should be attributed to the TEMC on the sample and dendrite scales.
机译：研究了横向磁场（B <1 T）对定向凝固Al-Si合金中凝固组织的影响。实验结果表明，在Al-7 wt pct Si合金和Al-7 wt pct Si-1 wt pct Fe合金中，磁场引起宏观偏析，枝晶细化以及糊状区长度的减小。此外，磁场的施加能够从Al-7 wt pct Si-1 wt pct Fe合金中分离出富铁金属间相。在Al-Si合金定向凝固过程中，对热电对流（TEMC）进行了数值模拟。结果表明，当磁场达到临界磁场强度（）时，TEMC增大到最大值（），然后随着磁场强度的进一步增加而减小。 TEMC表现出多尺度效应：和值在各个尺度上都不同，随着尺度的减小而减小和增大。磁场下凝固组织的改变应归因于样品和枝晶尺度上的TEMC。

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