| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Mechanisms of Non-Arrhenius Grain Boundary Motion: A Study of Activation Energy Distributions and Atomic Processes |
| Author(s) |
Eric Stephen Bridenstine, Darcey M. Britton, Gregory B. Thompson, Eric R. Homer, Oliver K. Johnson |
| On-Site Speaker (Planned) |
Eric Stephen Bridenstine |
| Abstract Scope |
Anomalous non-Arrhenius grain boundary (GB) motion is observed in simulations and experimentally, in which some GBs move faster at lower temperatures. Prior work used the generalized form of a classical model for GB motion and activation energies obtained by the typical procedure of fitting velocity vs. temperature data. In this work we introduce new analytical approaches to investigate non-Arrhenius behavior and study the underlying mechanisms at a higher resolution. An incoherent twin grain boundary, Σ3 (11_8_5) / (8_11_5), is simulated across seven different temperatures. We extract and examine an energy landscape during GB migration, and using power spectrum analysis we identify characteristic patterns of motion. We also find that GB motion is characterized by a distribution of activation energies--which we quantify--rather than the typically assumed single activation energy, and describe the atomic processes associated with these energy barriers. These techniques and results help determine the cause of non-Arrhenius GB migration. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Thin Films and Interfaces, Copper / Nickel / Cobalt |