| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XVIII
|
| Presentation Title |
Measuring Metallic Glass Viscosities Over Wide Composition Ranges |
| Author(s) |
Sebastian A. Kube, Theo Evers, Will Polsky, Rodrigo Miguel Ojeda Mota, Kevin Ryan, Jan Schroers |
| On-Site Speaker (Planned) |
Sebastian A. Kube |
| Abstract Scope |
Amongst the most fundamental properties of metallic glasses (MGs) are the viscosity η(T) and the fragility parameter. Measuring these is challenging and data have only been reported for few compositions and systems. Here, we present a new experimental method to measure the viscosity and fragility across wide composition ranges and for various MG systems: Using co-sputtering and silicon etching, we prepare samples of circular MG thin film membranes freely suspended on silicon chips. Applying gas pressure, these membranes are thermoplastically deformed between Tg and Tx. As the membranes expand into spherical shape, we track the deformation rate as function of the temperature and pressure difference. Using our model of spherical membrane deformation, we then compute viscosities for the full temperature range. We implement this method in a high-throughput fashion and aim to answer fundamental questions, for example how the fragility and the glass forming ability are correlated for MGs. |
| Proceedings Inclusion? |
Planned: |