Regensburg 2013 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 65: Liquid & Amorphous Metals II
MM 65.5: Talk
Thursday, March 14, 2013, 18:15–18:30, H26
Atomic structure and glass-forming ability of Ni64Zr36 and Cu65Zr35 alloys — •Ivan Kaban1,2, Pal Jovari3, Valentin Kokotin4, Olga Shuleshova2, Brigitte Beuneu5, Karel Saksl6, Norbert Mattern2, Jürgen Eckert1,2, and Lindsay Greer7 — 1TU Dresden, Institute of Materials Science, Germany — 2IFW Dresden, Institute for Complex Materials, Germany — 3Institute for Solid State Physics and Optics, Budapest, Hungary — 4Access e.V., Aachen, Germany — 5Laboratoire Leon Brillouin, CEA-Saclay, France — 6Institute of Materials Research, Kosice, Slovak Republic — 7Department of Materials Science and Metallurgy, University of Cambridge, UK
Atomic structure of Ni64Zr36 and Cu65Zr35 alloys in glassy and crystalline states has been investigated by different experimental techniques (X-ray diffraction, neutron diffraction with isotopic substitution, extended X-ray absorption spectroscopy) and theoretical methods (reverse Monte-Carlo simulation, molecular dynamics modelling, Voronoi analysis) to explain the differences in the glass-forming abilities of these two compositions. It is established that the Ni64Zr36 glass is characterized by pronounced topological and chemical ordering, while the Cu65Zr35 glass is topologically ordered and chemically rather disordered. Remarkably large differences in the partial pair distribution functions for the Cu65Zr35 alloy in glassy and crystalline states are suggested to play a decisive role in increasing its bulk-glass-forming ability.