Liquid–liquid demixing and microstructure of Co–Cu–Zr alloys with low Zr content |
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| Affiliation: | 1. IFW Dresden, Institute for Complex Materials, P.O. Box 270116, D-01171 Dresden, Germany;2. TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany;1. Groupe de Physique des Matériaux, CNRS UMR 6634, Université et INSA de Rouen, St-Etienne-du-Rouvray, France;2. Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS UMR 7239, Université de Lorraine, Metz, France;1. University of the Basque Country UPV-EHU, Bilbao, Spain;2. Ural Federal University, Ekaterinburg, Russia;3. BCMaterials, Bilbao, Spain;1. Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany;2. Interdisciplinary Centre for Advanced Materials Simulation, Ruhr-Universität Bochum, 44780 Bochum, Germany;1. Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology, Baotou 014010, China;2. Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;3. Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;4. Inner Mongolia Baotou Steel Rare Earth Magnetic Materials Co.Ltd, Baotou 014030, China;5. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Liquid–liquid phase separation and its effect on the microstructure has been investigated along the quasi-binary line (Co40Cu60)100−xZrx with x = 2, 4, 6, 9 and additionally for (Co50Cu50)94Zr6 and (Co60Cu40)94Zr6. The elemental distributions and the microstructures were analyzed by scanning electron microscopy and energy dispersive X-ray spectroscopy for samples that were (i) processed by thermal cycling in alumina crucibles at 10, 20 and 30 K/min with simultaneous differential thermal analysis, (ii) rapidly quenched by single-roller melt spinning and (iii) quenched after having been electromagnetically levitated at various temperatures. The metastable miscibility gap of the binary Co–Cu system with phase separation into Co- and Cu-rich liquids transforms into a stable miscibility gap for Zr contents 3 < x < 7.5 with separation into Co/Zr-rich and Cu-rich liquids. In contrast to the binary Co–Cu system where the Cu-rich liquid phase always surrounds the Co-rich phase, the Zr addition modifies the surface tension energies and/or wetting behavior in a peculiar way so that the Co/Zr-rich phase always encloses the Cu-rich liquid phase concerning the ternary Co–Cu–Zr system in that compositional range. The macrosegregation morphologies of the liquid phase separation that built up via Ostwald ripening, gravity-driven convection, collision, coalescence and wetting effects proceed on a very short time scale and even samples that have been prepared by rapid quenching techniques still exhibit phase separated regions in the micrometer regime. |
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