Undercooling and solidification of metallic-like liquid silicon

类金属液态硅的过冷与凝固

• 批准号: 5397256
• 负责人: Professor Dr. Dieter M. Herlach (†)
• 金额: --
• 依托单位: School of Materials Science and Engineering (MSE)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5397256?language=en
• 关键词: Undercooling; solidification; metallic; like; liquid

Electromagnetic and electrostatic levitation technique is applied to undercool liquid Si and Si-Sn drops in diameter up to 10 mm. The crystal growth velocity is measured as a function of undercooling. The microstructures of the as-solidified samples are analysed by Scanning Electron Microscopy and X-Ray Diffraction. In this project the change of the growth kinetics and its influence on the morphology of the solidified microstructure will be investigated in pure Si and Si-Sn alloys as well. Special attention will be placed to the transition of faceted to non-faceted growth. The results will be discussed within modern theory of free dendritic growth of solid phase in undercooled melt.

电磁和静电悬浮技术应用于过冷液态硅和直径达10毫米的硅锡液滴。晶体生长速度作为过冷的函数来测量。用扫描电镜和x射线衍射分析了凝固态试样的显微组织。本课题还将研究纯Si和Si- sn合金中生长动力学的变化及其对凝固组织形貌的影响。我们将特别注意从多面成长到无多面成长的过渡。结果将在过冷熔体中固相自由枝晶生长的现代理论中进行讨论。