Regensburg 2007 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 20: Poster session
MM 20.5: Poster
Dienstag, 27. März 2007, 14:45–18:00, Poster C
Dendritic and eutectic solidification of undercooled Ni-Zr alloys — •Helena Hartmann1,2, Sven Reutzel1,2, Peter Galenko2, and Dieter Herlach2 — 1Institut für Experimentalphysik IV, Ruhr-Universität, 44780 Bochum, Germany — 2Institut für Materialphysik im Weltraum, DLR, 51170 Köln, Germany
New measurements of dendritic and eutectic growth velocity in levitated undercooled Ni-Zr samples are performed as a function of undercooling ΔT. The new data reveal high accuracy and low scattering. The growth velocity is measured by using a high-speed camera and subsequently, the morphology of the microstructure of the solidified samples is investigated. The data for eutectic growth of Ni - 8.8 at.% Zr alloy are compared with the previously measured growth velocity data set of dendritic growth of Ni - 1 at.% Zr alloy. Experimental results on kinetics of dendritic and eutectic growth in Ni-Zr alloy samples are discussed and analysed within the current models of non-equilibrium solidification.