Regensburg 2016 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 6: Liquid and Amorphous Metals II: Shear bands

MM 6.4: Talk

Monday, March 7, 2016, 12:15–12:30, H52

Creep of Cu-Zr glass composites studied by Molecular Dynamics simulations — •Constanze Kalcher, Tobias Brink, Alexander Stukowski, and Karsten Albe — FG Materialmodellierung, FB Materialwissenschaft, Technische Universität Darmstadt, Germany

Over the past two decades, the mechanical properties of metallic glasses have been studied intensively. It is widely accepted that their deformation at low temperature is heterogeneous and that in this regime shear bands can occur. However, when considering high-temperature applications, closer to the glass transition temperature, T > 0.6   T_g, the possibility of plastic deformation through creep has to be taken into account. In contrast to crystals, where one can clearly distinguish between three different creep stages, the mechanisms behind high-temperature creep behavior of amorphous alloys is still unclear. In this work we compare a homogeneous Cu₆₄Zr₃₆ glass with glass-crystal (B2 Zr) composites with different topologies: a) interpenetrating network b) rods and c) embedded particles. While the pristine metallic glass deforms homogeneously, the glass-crystal composites form shear transformation zones at the glass/crystal interfaces. Furthermore, we show what influence the topology of the interfaces has on the creep behavior and its activation energy.