金属学报英文版 ›› 2015, Vol. 28 ›› Issue (6): 725-732.DOI: 10.1007/s40195-015-0253-5

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  • 收稿日期:2014-07-24 修回日期:2014-12-01 出版日期:2015-03-19 发布日期:2015-07-23

Directional Growth of Tin Crystals Controlled by Combined Solute Concentration Gradient Field and Static Magnetic Field

Lei Li1(), Bo Xu2, Wei-Ping Tong1, Hui Zhang1, Chun-Yan Ban1, Li-Zi He1, Zhi-Hao Zhao1, Yu-Bo Zuo1, Qing-Feng Zhu1, Jian-Zhong Cui1   

  1. (1)Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110819, China
    (2)School of Metallurgy and Energy, Hebei United University, Tangshan, 063009, China
  • Received:2014-07-24 Revised:2014-12-01 Online:2015-03-19 Published:2015-07-23

Abstract:

A new method was introduced to achieve directional growth of Sn crystals. Microstructures in liquid (Pb)/liquid (Sn) diffusion couples were investigated under various static magnetic fields. Results show that the β-Sn crystals mainly reveal an irregular dendritic morphology without or with a relatively low static magnetic field (≤0.3 T). When the magnetic field is increased to 0.5 T, the β-Sn dendrites close to the final stage of growth begin to show some directional character. With a further increase in the magnetic field to a higher level (0.8-5 T), the β-Sn dendrites have an enhanced directional growth character, but the dendrites show a certain deflection. As the magnetic field is increased to 12 T, the directional growth of the β-Sn dendrites in the center of the couple is severely destroyed. The mechanism of the directional growth of the β-Sn crystals and the deflection of the β-Sn crystals with the application of static magnetic field was tentatively discussed.

Key words: Microstructural, evolution, Crystallization, behavior, Dendrite, growth, Diffusion, behavior, Magnetic, field, Solidification, pattern