Solidification kinetics of a Cu-Zr alloy: ground-based and microgravity experiments

[摘要] Experimental and theoretical results obtained in the MULTIPHAS-project (ESA-European Space Agency and DLR-German Aerospace Center) are critically discussed regarding solidification kinetics of congruently melting and glass forming Cu50Zr50alloy samples. The samples are investigated during solidification using a containerless technique in the Electromagnetic Levitation Facility [1]. Applying elaborated methodologies for ground-based and microgravity experimental investigations [2], the kinetics of primary dendritic solidification is quantitatively evaluated. Electromagnetic Levitator in microgravity (parabolic flights and on board of the International Space Station) and Electrostatic Levitator on Ground are employed. The solidification kinetics is determined using a high-speed camera and applying two evaluation methods: "Frame by Frame" (FFM) and "First Frame - Last Frame" (FLM). In the theoretical interpretation of the solidification experiments, special attention is given to the behavior of the cluster structure in Cu50Zr50samples with the increase of undercooling. Experimental results on solidification kinetics are interpreted using a theoretical model of diffusion controlled dendrite growth.

[发布机构] Friedrich-Schiller-Universität Jena, Otto-Schott-Institut für Materialforschung, Jena; D-07743, Germany^1;Ural Federal University, Laboratory of Multi-Scale Mathematical Modeling, Ekaterinburg; 620002, Russia^2;Deutsches Zentrum für Luft- und Raumfahrt, Institut für Materialphysik im Weltraum, Köln; 51170, Germany^3;Ruhr-Universität, Physikalisch-Astronomische Fakultät, Bochum; 44810, Germany^4;Udmurt State University, Faculty of Physics and Energetics, Izhevsk; 426037, Russia^5

[效力级别] 计算机科学

[关键词] Containerless techniques;Dendritic solidification;Electro-magnetic levitators;Electromagnetic levitation;Experimental investigations;German aerospace centers;International Space stations;Microgravity experiments