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MM: Fachverband Metall- und Materialphysik
MM 20: Topical Session: Thermophysical Properties of Bulk Metallic Glasses and Bulk Metallic Glass-forming Liquids
MM 20.6: Vortrag
Mittwoch, 19. März 2025, 17:45–18:00, H10
Study of solidification behaviour of undercooled Zr-Ni-Cu melts — •Chu Yu1,4, Fan Yang2, Dirk Holland-Moritz2, Yindong Fang1,4, Ivan Kaban3, Stephanie Lippmann4, and Peter K. Galenko1 — 1Otto Schott Institute of Material Research, Friedrich Schiller University Jena, Jena, Germany — 2Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt, Cologne, Germany — 3Leibniz IFW Dresden, Institute for Complex Materials, Dresden, Germany — 4Institute of Applied Physics, Friedrich Schiller University Jena, Jena
We investigate the solidification behaviour of the glass-forming Zr50Cu35Ni15 alloy employing different levitation techniques. The primary phase solidified from the undercooled melt has been found to be independent of the degree of undercooling up to a level beyond the hypercooling limit, as observed by time-resolved X-ray diffraction. The crystal growth velocity has been measured employing electromagnetic levitation (EML), where solidification occurs under stronger fluid-flow conditions compared to previous studies employing electrostatic levitation (ESL). In both cases the observed growth velocity increases with increasing undercooling, before reaching a plateau at undercoolings between 260-320 K. However, at small undercooling the growth velocities measured with EML are slightly higher than that in ESL. The solidification kinetics is discussed in terms of different crystal growth models, taking into account the effect of fluid flow. The works is supported by DFG, DLR, ESA via MULTIPHAS-project Nr. 50WM1941, and ProChance-exchange Program of the FSU Jena.
Keywords: glass forming alloys; solidification; levitation; crystal growth velocity