| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XVIII
|
| Presentation Title |
Stress Breaks Universal Aging Behavior in a Metallic Glass |
| Author(s) |
Amlan Das, Peter Derlet, Chaoyang Liu, Eric Dufresne, Robert Maass |
| On-Site Speaker (Planned) |
Amlan Das |
| Abstract Scope |
Subjecting a metallic glass to increasing temperature leads to thermally activated relaxation dynamics that is often well described by monotonically increasing relaxation times as function of waiting time (aging) at a given temperature. Universal scaling laws have been proposed for the dependence of relaxation time on waiting time, irrespective of alloy composition. Here, we use x-ray photon correlation spectroscopy (XPCS) to reveal how stress within the elastic regime breaks the universal scaling laws of relaxation dynamics in a prototypical Zr-based metallic glass. In particular, we highlight how stresses within the elastic regime can cause dramatic changes to aging even at room temperature, where momentary relaxation times can fluctuate significantly as a function of time, stress magnitude, and loading mode. Using molecular dynamics simulations, we suggest atomic-scale mechanisms that can lead to the measured non-monotonic relaxation behaviour, under stress. |
| Proceedings Inclusion? |
Planned: |