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MM: Fachverband Metall- und Materialphysik
MM 15: Poster session I
MM 15.39: Poster
Monday, March 7, 2016, 18:00–20:00, Poster B3
Influence of thermal and mechanical pre-treatment on the properties of bulk metallic glasses — •Niklas Olschewski1, Moritz Stolpe2, Christian Simon1, Harald Rösner1, Ralf Busch2, and Gerhard Wilde1 — 1Institute of Materials Physics, University of Münster, Germany — 2Chair for Metallic Materials, Department of Materials Science, Saarland University, Germany
Metallic glasses provide many advantageous properties such as high elasticity, wear resistance and yield strength. Despite these features and the possible merits for the use of metallic glasses in applications, the evolution of the microstructure in glasses upon external influences such as mechanical stress or temperature is still not fully understood. An example is the formation of so called shear bands, which evolve in glasses after a certain degree of deformation: the microscopic origin of such unit shear events is still unresolved.
The presented work focuses on the impact of mechanical pre-deformation and thermal treatment by calorimetry at different rates on the state of a bulk metallic glass. In particular the dependence of the materials properties on different strain rates during linear and cyclic deformation as well as the behavior of the glass-transition for various heating rates was investigated. The results of these investigations lead to an improvement in understanding; that is, how the history of a glass, whether mechanical or thermal, is linked to its macroscopic properties.