Solidification of Bulk Lamellar Eutectics

Abstract:

Eutectic alloys from the ternary system Al-Cu-Ag are excellent model alloys for the investigation of coupled eutectic growth, not only because most materials properties are well known but also because the system offers a rich variety of crystal structures and crystal orientation relationships (ORs) being associated to distinct minima of the solid-solid interface energy. This paper describes three research topics specifically related to bulk lamellar Al-Al₂Cu eutectics, e.g. the maze-to-lamellar transition during early growth, the role of fault lines during lamellar spacing selection close to the pinch-off limit and the onset of eutectic cell formation above the constitutional supercooling limit. These topics are central to the microgravity experiments SETA presently being prepared for the MSL / SQF.

• Periodical: Materials Science Forum (Volumes 790-791)
• Pages: 343-348
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.790-791.343
• Online since: May 2014
• Authors: Ulrike Hecht*, Victor Witusiewicz, Stephan Rex
• Keywords: Coupled Growth, Eutectic, Lamellar Defects, Ternary Alloys

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