| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Cyclical Restructuring of Emergent Grain Boundaries During Polycrystalline Thin Film Growth |
| Author(s) |
Moneesh Upmanyu, Hailong Wang, Mengyuan Wang |
| On-Site Speaker (Planned) |
Moneesh Upmanyu |
| Abstract Scope |
In textured FCC films, surface valleys and ridges form at emergent grain boundaries as they reorient their misorientation axes towards low energy cusps. The boundary restructuring occurs to nanoscopic lengths and generates elastic stresses that stabilize the co-existence of the boundary complexions. Our deposition computations of bicrystalline (111) copper films reveal non-equilibrium dynamics of the restructuring at a valley correlated with layer growth. Island nucleation during early stages of layer formation drives diffusion fluxes to the surface that increase the restructured height. Subsequent step flow is marked by flux reversal towards the boundary as adatom attachment decreases the valley depth , and therefore the restructured height. As the layer growth approaches completion, the restructured height again increases as compressive stresses build up due to boundary densification. The coupling of the boundary restructuring with layer growth represents a new mechanism for stress and morphological evolution in polycrystalline thin films. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Modeling and Simulation, Phase Transformations |