Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 25: Poster Session
MM 25.23: Poster
Mittwoch, 29. März 2006, 15:30–17:30, P4
Microstructural investigation of Zr73.5Nb9Cu7Ni1Al9.5 nanostructure-dendrite composites produced by different casting techniques — •K. B. Kim1, J. Das1,2, W. Löser2, M. H. Lee3, D. H. Kim4, S. K. Roy5, and J. Eckert1,2 — 1FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, Petersenstraße 23, D-64287 Darmstadt, Germany — 2Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Institut für Metallische Werkstoffe, Postfach 270016, D-01171 Dresden, Germany — 3Materials and Engineering Physics Program, Ames Laboratory, Iowa State University, Ames IA 50011, USA — 4Center for Noncrystalline Materials, Department of Metallurgical Engineering, Yonsei University, 134 Schinchon-dong, Seodaemun-ku, Seoul, 120-749, Korea — 5Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur-721302, India
Zr73.5Nb9Cu7Ni1Al9.5 nanostructure-dendrite composites were fabricated using two different casting techniques: centrifugal casting and arc-melting. The microstructures of the centrifugally-cast and the arc-melted samples are overall homogeneous, consisting of micrometer-scale dendrites that are homogeneously distributed in a nanostructured matrix. The comparison of the microstructures of these two alloys reveals that the formation of nano-scale twins and a disordered ω-phase in the β-Zr dendrites only happens in the centrifugally-cast sample. The differences in the phases and the microstructures between the differently prepared samples significantly influence the corresponding mechanical properties of the specimens.