Dec 8 – 10, 2020 Online only
Online event
Europe/Berlin timezone

Structure-dynamics relation in Zr-Ti melts

Dec 10, 2020, 3:30 PM
15m
Online event

Online event

Talk DN: Materials DN2020: Materials

Speaker

Fan Yang (Deutsches Zentrum für Luft- und Raumfahrt)

Description

The early transition metals Zirconium and Titanium show very similar chemical and structural properties. The binary Zr-Ti alloys compose a completely miscible system, which is also a boundary system for many bulk metallic glasses (BMGs) and stable quasicrystals. However, the detailed formation mechanisms of these special structures remain largely unknown and are often speculative, since for these chemically reactive, high melting temperature alloys accurate knowledge of melt properties is largely missing. Using containerless levitation techniques, we successfully investigated the microscopic structure and dynamics of the Zr-Ti melts over a large temperature range. Neutron and synchrotron diffraction experiments reveal a melt structure exhibiting barely any chemical short-range order. On the Zr-rich side, the Ti diffusivity obtained by quasi-elastic neutron scattering decreases with increasing Ti content. Such a concentration dependent atomic dynamics can be fully understood according to the prediction of the Mode-Coupling Theory (MCT) on a binary hard-sphere mixture with a small size disparity. Our results indicate the dominant impact of the topological structure on the atomic motion in the Zr-Ti melts.

Primary authors

Sandro Szabo (Heinz Maier-Leibnitz Center (MLZ) and Physics Department, Technical University of Munich, Lichtenbergstrasse 1, 85748 Garching, Germany) Fan Yang (Deutsches Zentrum für Luft- und Raumfahrt) Dirk Holland-Moritz Prof. Thomas Voigtmann (Institute of Materials Physics in Space, German Aerospace Center (DLR)) Andreas Meyer (German Aerospace Center) Winfried Petry (FRM II - TUM)

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