Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 39: Liquid and Amorphous Metals I - Shearbands
MM 39.1: Vortrag
Mittwoch, 2. April 2014, 10:15–10:30, IFW A
Kinetics of single shear bands in Zr-based bulk metallic glasses — •Peter Thurnheer1, Robert Maaß2, Stefan Pogatscher1, Alireza Saeed-Akbari1, and Jörg F. Löffler1 — 1Laboratory of Metal Physics and Technology, Department of Materials, ETH Zürich, 8093 Zürich, Switzerland — 2Nanoskalige Materialien, Institut für Materialphysik, Georg-August Universität Göttingen, 37077 Göttingen, Germany
Mechanical properties of bulk metallic glasses are generally assessed by compression testing. However, quantities such as plasticity or the material’s ability to strain-harden are often modified by geometric effects. These include initiation of constrained shear bands at sample corners and shear-band arrest at contact points between emerging shear-offsets and the cross-heads of the machine. To study freely propagating shear bands, the compression samples are equipped with a small notch, which promote the initiation of a single, major shear band well off the sample corners. In this work, we present results on the compositional dependence of single-shear-band dynamics for a set of Zr-based bulk metallic glasses, and review recent theories and experiments on shear-band propagation modes.