Directional Growth of Tin Crystals Controlled by Combined Solute Concentration Gradient Field and Static Magnetic Field
来源期刊：Acta Metallurgica Sinica2015年第6期
论文作者：Lei Li Bo Xu Wei-Ping Tong Hui Zhang Chun-Yan Ban Li-Zi He Zhi-Hao Zhao Yu-Bo Zuo Qing-Feng Zhu Jian-Zhong Cui
文章页码：725 - 732
摘 要：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（B0.3 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.
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. Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education, Northeastern University2. School of Metallurgy and Energy, Hebei United University
摘 要：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（B0.3 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.
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