| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure-Property Relationships of Bulk Metallic Glasses
|
| Presentation Title |
Atomic-scale Dynamics in the Microplastic Regime of a Metallic Glass |
| Author(s) |
Birte Riechers, Amlan Das, Eric Dufresne, Peter Derlet, Robert Maass |
| On-Site Speaker (Planned) |
Robert Maass |
| Abstract Scope |
The disordered structure of metallic glasses suggests the presence of shallow barrier energies for structural excitations. Atomistic simulations link such low-energy transitions to domains of higher structural frustrations that are surrounded by extended networks of minimally frustrated atomic arrangements (Phys. Rev. Mat. 5 (2021) 125601). Upon loading, these two structural components are expected to respond differently, raising the question what the microscopic limit of a metallic glass is. Here we address this question by in-situ static loading experiments during x-ray photon correlation spectroscopy. We find that within the resolution of our experiments, structural relaxation times reduce by a factor of ten at stresses as small as 0.5% of the yield stress. At the same time, we reveal that the shape parameter of the structural decorrelation scales inversely with the applied stress. We discuss these finding in terms of microplasticity and mechanical rejuvenation of metallic glasses. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, |