| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Structure-Property Relationships of Bulk Metallic Glasses
|
| Presentation Title |
Synchrotron X-ray Study of the Extreme Rejuvenation of Bulk Metallic Glasses by Triaxial Compression |
| Author(s) |
Nikolaos T. Panagiotopoulos, Konstantinos Georgarakis, Philip A. Chater, Yi Li, A. Lindsay Greer |
| On-Site Speaker (Planned) |
A. Lindsay Greer |
| Abstract Scope |
The effectively zero ductility of as-cast bulk metallic glasses (BMGs) greatly hinders their wider use in structural applications. Triaxial compression of circumferentially notched rods of Zr-based BMGs can induce extreme rejuvenation in the central region, taking the glasses to states (assessed in terms of enthalpy or fictive temperature) that are characteristic of quenching rates over seven orders higher than the actual rate during casting. Mechanical tests on the rejuvenated samples show strain hardening, suppression of shear banding, and clear tensile ductility. The structural effects of the triaxial compression, and thereby the mechanisms of the rejuvenation, are studied in this work. We apply high-energy X-ray diffraction (HEXRD) and pair distribution function (PDF) analysis to probe the structural states and internal stress distributions. Correlative mapping, of the diffraction data and nanomechanical characterization, aids in understanding the rejuvenation mechanism and in establishing the capabilities and limits of the triaxial compression technique. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Solidification, Other |