| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermal Property Characterization, Modeling, and Theory in Extreme Environments
|
| Presentation Title |
Thermal Resistance at a Twist Interface: Dislocation Grid and Misorientation Phonon Scattering |
| Author(s) |
Ramya L. Gurunathan, Riley Hanus, G. Jeffrey Snyder |
| On-Site Speaker (Planned) |
Ramya L. Gurunathan |
| Abstract Scope |
The primary models to describe phonon scattering at an interface, the acoustic mismatch model and diffuse mismatch model, only consider the bulk properties of the material on either side of the interface, but not the structure that can exist at the interface itself. At the nanoscale, low-energy grain boundaries are composed of arrays of dislocations which produce periodic strain fields. Here, we discuss the heat dissipation effects of a twist boundary, which can be decomposed into two interpenetrating sets of either screw dislocations, forming a dislocation grid. Strain scattering theory is used to capture the thermal resistance due to the dislocation grid. Additionally, a reformulation of the acoustic mismatch model is used to capture the scattering effects of the solid rotation at the twist interface. The thermal boundary resistance predictions from the model capture experimental trends and are close in magnitude to molecular dynamics results. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Energy Conversion and Storage, |