Dresden 2026 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 21: Phase Transformations II
MM 21.1: Vortrag
Mittwoch, 11. März 2026, 10:15–10:30, SCH/A215
On the nature of solutal melting in Cu-Pd — •Nagarjuna Remalli1, Huai Zhang1,2, Nisha Singh1, Nuria Navarrete1, Julien Zollinger3, and Florian Kargl1,4 — 1Institute for Frontier Materials on Earth and in Space, German Aerospace Center (DLR), 51147 Cologne, Germany — 2Department of Mechanical Engineering, University of Alberta, AB T6G 2G8 Alberta, Canada — 3Université de Lorraine, Institut Jean Lamour, 54000 Nancy, France — 4Foundry Institute, Fundamentals of Solidification, RWTH Aachen University, 52072 Aachen, Germany
We report on the kinetics of the solid-liquid (s-l) interface during solutal melting of isomorphous Cu-Pd melting couples. Using X-ray radiography (XRR) with sub-second time resolution the solutal melting dynamics along with the evolution of solute concentration fields was investigated. To this end circular melting couples of different thicknesses (220 µm and 460 µm) were in-situ monitored in an isothermal field at 1090∘C slightly above the melting point of copper (1085∘C) and well below the one of palladium (1555∘C).
Sample thickness dependent differences in dissolution speed were observed which are suggested to be related with buoyancy-driven convective flow. By comparing SEM analysis results of the re-solidified Cu-Pd alloys with the in-situ results good agreement was found. Persistent non-equilibrium conditions were found at the s-l interface at the end of melting, independent of sample thickness or melting mechanism.
Keywords: Additive manufacturing; Remelting; Melting mechanisms; Solid-liquid interface; Non-equilibrium