Effect of a traveling magnetic field on freckle formation of directionally solidified Pb–Sn alloys
Effect of a traveling magnetic field on freckle formation of directionally solidified Pb–Sn alloys
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DOI：
10.1557/jmr.2017.42
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发表时间：
2017-06
影响因子：
2.7
通讯作者：
L. Qin;Jun Shen;Qiudong Li;Z. Shang
中科院分区：
文献类型：
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作者：
L. Qin;Jun Shen;Qiudong Li;Z. Shang
研究了行磁场（TMF）对Pb-Sn合金定向凝固中雀斑形成的影响。实验结果表明，在没有任何磁场的情况下，雀斑可以在向上的TMF下形成。在前一种情况下，地层位置为中心。后一种情况下，随着TMF强度的增加，它从中心向表面偏转。然而，在向下的TMF下，雀斑不会形成。数值结果表明，在上向TMF作用下，地层位置的变化应归因于固液界面形状的不同，而在下向TMF作用下，地层不形成应归因于TMF驱动的对流强度。这些磁场被用来调节熔体流动，这与重力的影响类似。为了消除雀斑，可以在合适的向下TMF下建立微重力环境。
Effects of traveling magnetic field (TMF) on freckle formation of directionally solidified Pb–Sn alloys were investigated experimentally and numerically. The experimental results demonstrated that freckles could form without any magnetic field and with the upward TMF. In the former case, the formation location is the center. In the latter case, it diverted from the center to the surface with the increasing intensity of TMF. However, freckle could not form under the downward TMF. Numerical results indicated that the change of the formation location under upward TMF should be attributed to the different solid/liquid interface shape, and no formation under downward TMF should be attributed to the convection intensity driven by TMF. These magnetic fields are used to modulate melt flow, which is similar to the effects of the gravity. For eliminating freckle, a microgravity environment can be established under the suitable downward TMF.