Undercooling and solidification of metallic-like liquid silicon

• Applicant: Professor Dr. Dieter M. Herlach (†)
• Subject Area: Glass, Ceramics and Derived Composites
• Term: from 2002 to 2006
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 5397256

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.

• DFG Programme: Research Grants
• International Connection: China
• Participating Person: Professor Dr. Riping Liu