| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XVIII
|
| Presentation Title |
Tracing Structural Dynamics in Metallic Glasses during Cryogenic Cycling |
| Author(s) |
Amlan Das, Eric Dufresne, Robert Maass |
| On-Site Speaker (Planned) |
Robert Maass |
| Abstract Scope |
Metallic glasses relax continuously with time and methods to uniformly rejuvenate the material are needed. One promising avenue is cryogenic-cycling, but the fundamental structural processes induced by this method are not well understood. In order to shed more light onto the structural processes of cryogenic cycling, we pursue in-situ x-ray photon correlation spectroscopy to trace the atomic-scale structural dynamics of a Zr-based metallic glass. This method allows calculating the relaxation times as a function of time in-situ during thermal cycling. It is found that cryogenic cycling homogenizes the relaxation time distribution. We furthermore reveal how fast atomic-scale dynamics is correlated with long-time structural relaxation times, and that fast atomic-scale relaxation are more prominent in rapidly quenched ribbons than in a bulk plate material. Overall, a picture emerges that points towards heterogeneities in fictive temperature as a requirement for cryogenic energy storage. |
| Proceedings Inclusion? |
Planned: |