Dresden 2006 – wissenschaftliches Programm

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MM: Metall- und Materialphysik

MM 35: Growth

MM 35.2: Vortrag

Donnerstag, 30. März 2006, 15:00–15:15, IFW B

Crystal growth in undercooled Ti-Al-Nb melts — •Dirk Holland-Moritz and Thomas Volkmann — DLR, Institut für Raumsimulation, D-51147 Köln, Germany

Investigations on the solidification behaviour of undercooled Ti-Al-Nb melts are presented. The liquids are undercooled by application of the electromagnetic levitation technique. Maximum levels of undercooling of up to 320 K are achieved. Crystal growth during solidification of the undercooled melts is observed using a high-speed video camera at frame rates of 30000 frames per second. At small undercoolings an irregular shape of the solidification front is found. At larger levels of undercooling the growth front is smooth, but exhibits a pronounced anisotropy. From the recorded video sequences the growth velocities are determined as a function of the undercooling.

This work was financially supported by the IMPRESS Integrated Project (Contract NMP3-CT-2004-500656) that is co-funded by the European Commission in the 6th Framework Programme, the European Space Agency and the Swiss Government.