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

• Published in: Acta metallurgica sinica : English letters Vol. 28; no. 6; pp. 725 - 732
• Main Authors: Li, Lei, Xu, Bo, Tong, Wei-Ping, Zhang, Hui, Ban, Chun-Yan, He, Li-Zi, Zhao, Zhi-Hao, Zuo, Yu-Bo, Zhu, Qing-Feng, Cui, Jian-Zhong
• Format: Journal Article
• Language: English
• Published: Beijing The Chinese Society for Metals 01.06.2015; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Concentration gradient; Continuous casting; Cooling; Corrosion and Coatings; Crystal growth; Crystals; Deflection; Dendritic structure; Directional solidification; Heat; Lead; Lead (metal); Liquids; Magnetic fields; Materials Science; Metallic Materials; Nanotechnology; Organometallic Chemistry; Spectroscopy/Spectrometry; Temperature; Tin; Tribology; 定向生长; 晶体; 梯度场; 溶质浓度; 磁场控制; 锡; 静态磁场; 静磁场; Microstructural evolution; Solidification pattern; Diffusion behavior; Crystallization behavior; Magnetic field; Dendrite growth
• ISSN: 1006-7191; 2194-1289
• DOI: 10.1007/s40195-015-0253-5

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.