Effect of transverse static magnetic field on radial microstructure of hypereutectic aluminum alloy during directional solidification
Effect of transverse static magnetic field on radial microstructure of hypereutectic aluminum alloy during directional solidification
复制标题
横向静磁场对过共晶铝合金定向凝固径向显微组织的影响
DOI：
10.1016/j.jmst.2020.11.025
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发表时间：
2021-06
影响因子：
10.9
通讯作者：
Xi Li
中科院分区：
文献类型：
--
作者：
Shaodong Hu;Long Hou;Kang Wang;Zhongmiao Liao;Wen Zhu;Aihua Yi;Wenfang Li;Yves Fautrelle;Xi Li
研究了在横向静磁场作用下，不同尺度的热电磁对流（TEMC）对过共晶铝合金定向凝固组织的影响，重点研究了斑点的形成。我们的实验和数值模拟结果表明，在横向静磁场下，在样品尺度上的TEMC循环导致溶质Al在样品一侧富集。当磁场强度增加到0.5T时，TEMC和溶质富集度随磁场强度的增加而增加。磁场作用下溶质元素的富集程度受温度梯度和生长速率的影响。溶质Al在试样径向上的不均匀分布导致了一次枝晶臂间距（PDAS）的不均匀分布。此外，外加磁场可导致雀斑的形成，且雀斑的数量随磁场的增加而增加。斑点的变化与一次枝晶或一次枝晶网络在磁场作用下的各向异性所引起的各向异性TEMC相一致。最后，研究了磁场作用下定向凝固过程中各向异性热电磁场、溶质Al分布和PDAS协同作用对斑点形成和演化的影响机理。
The effect of different scales thermoelectric magnetic convection (TEMC) on the radial solidification microstructure of hypereutectic Al alloy has been investigated under transverse static magnetic field during directional solidification, focusing on the formation of freckle. Our experimental and numerical simulation results indicate that the TEMC circulation at sample scale under transverse static magnetic field leads to the enrichment of solute Al on one side of the sample. The TEMC and the solute enrichment degree increase with the increase of magnetic field when the magnetic field increases to 0.5 T. The enrichment degree of solute elements under magnetic field is affected by temperature gradient and growth rate. The non-uniform distribution of solute Al in the radial direction of the sample results in the non-uniform distribution of primary dendrite arm spacing (PDAS). Moreover, the applied magnetic field can lead to freckle formation and its number increases with the increase of magnetic field. The change of freckle is consistent with the anisotropy TEMC caused by the anisotropy of primary dendrite or primary dendrite network under magnetic field. Finally, the mechanism of synergism effect of the anisotropy TEMC, the distribution of solute Al and the PDAS on freckle formation and evolution is studied during directional solidification under magnetic field.
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影响因子：
2.7
作者：
L. Qin;Jun Shen;Qiudong Li;Z. Shang
通讯作者：
L. Qin;Jun Shen;Qiudong Li;Z. Shang
影响因子：
0.7
作者：
Baltaretu, F.;Wang, J.;Fautrelle, Y.
通讯作者：
Fautrelle, Y.
DOI：
10.1007/s11661-001-0271-y
发表时间：
2001-02
期刊：
Metallurgical and Materials Transactions A
影响因子：
--
作者：
Wanhong Yang;Keh-Minn Chang;Wei Chen;S. Mannan;J. Debarbadillo
通讯作者：
Wanhong Yang;Keh-Minn Chang;Wei Chen;S. Mannan;J. Debarbadillo
影响因子：
9.4
作者：
L. Yuan;P. Lee
通讯作者：
L. Yuan;P. Lee
影响因子：
9.4
作者：
J. Madison;J. Spowart;D. Rowenhorst;L. Aagesen;K. Thornton;T. Pollock
通讯作者：
J. Madison;J. Spowart;D. Rowenhorst;L. Aagesen;K. Thornton;T. Pollock