Surface tension and viscosity of industrial alloys from parabolic flight experiments — Results of theThermoLab project |
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Authors: | Ragnhild Aune Livio Battezzati Rob Brooks Ivan Egry Hans-Jörg Fecht Jean-Paul Garandet Ken C. Mills Alberto Passerone Peter N. Quested Enrica Ricci Stephan Schneider Seshadri Seetharaman Rainer K. Wunderlich Bernard Vinet |
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Affiliation: | 1. Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden 2. Università degli Studi di Torino, Torino, Italy 3. National Physical Laboratory, Materials Centre, Teddington, UK 4. ZEUS (Zentrum für Erstarrung Unterkühlter Schmelzen) at DLR, Cologne, Germany 5. Materials Division, University of Ulm, Ulm, Germany 6. Department of Materials, Imperial College STM, London, UK 7. IENI-CNR Ge, Genoa, Italy 8. Département des Technologies pour les Engergies Nouvelles, CEA/DTEN, Grenoble, France
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Abstract: | The surface tension and the viscosity of a series of industrial alloys have been measured by the oscillating drop technique with an electromagnetic levitation device under reduced gravity conditions in several parabolic flights. It was demonstrated that the 20 seconds of reduced gravity available in a parabola were sufficient for melting, heating into the liquid phase, and cooling to solidification of typically 7 mm diameter metallic specimen. The surface tension and the viscosity were obtained from the frequency and the damping time constant of the oscillation which were evaluated from the temperature signal of a highresolution pyrometer. Alloys processed included steels, Ni-based superalloys, and Ti-alloys which were supplied by industrial partners to the project. Three to four parabolas were sufficient to obtain the surface tension and the viscosity over a large range in temperature. |
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