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MM: Fachverband Metall- und Materialphysik
MM 61: Liquid and Amorphous Metals V - Structure and structure formation
MM 61.5: Talk
Thursday, April 3, 2014, 16:45–17:00, IFW A
In-situ XRD studies of Cu-Zr alloys in amorphous, liquid and crystalline state — •Olga Shuleshova1, Ivan Kaban1,2, Jozef Bednarcik3, Dirk Holland-Moritz4, Jan Gegner4, Fan Yang4, Junhee Han1, Norbert Mattern1, and Jürgen Eckert1,2 — 1IFW Dresden, Institute for Complex Materials, 01171 Dresden, Germany — 2TU Dresden, Institute of Materials Science, 01062 Dresden, Germany — 3DESY Photon Science, 22607 Hamburg, Germany — 4DLR, Institut für Materialphysik im Weltraum, 51170 Köln, Germany
Structure and phase formation in the glass-forming Cu-Zr alloys have been studied in situ by high energy synchrotron X-ray diffraction. Heating of the glassy ribbons was carried out with a Linkam hot-stage, while the equilibrium and undercooled liquid alloys were studied with electrostatic levitation technique. Depending on the initial state (either amorphous of liquid), different sequences of crystalline phase formation have been observed. Analysis of the total pair distribution functions revealed larger differences between the crystalline and parent liquid phase for the alloys with relatively simple (cubic) phase nucleating from the melt, comparing to those where complex crystalline structures are formed. This is thought to indicate distinctions in crystal nucleation and/or growth rates depending on alloy composition, implying different mechanisms that govern glass formation in Cu-Zr system.