About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Nanostructured Materials in Extreme Environments
|
Presentation Title |
The Role of Grain Boundaries in the Morphological Instabilities of Nanoscale Geometries |
Author(s) |
Omar Marwan Hussein, Keith Coffman, Khalid Hattar, Eric Lang, Shen Dillon, Fadi Abdeljawad |
On-Site Speaker (Planned) |
Omar Marwan Hussein |
Abstract Scope |
Recent advances in high-precision manufacturing techniques have enabled the fabrication of materials with nanoscale features, such as nanolattices and nanoporous structures. However, the microstructural stability of such morphologies under high-temperature environments is not well understood. Using theoretical, experimental, and computational studies, we examine the stability of nanostructured morphologies. Our in-situ annealing studies of polycrystalline alumina rods demonstrate a pinch-off instability in which the rod breaks up into spatially isolated domains, a phenomenon reminiscent of the Plateau-Rayleigh instability in liquids. We develop a theoretical model to investigate the impact of grain boundaries (GBs) on the morphological instabilities of nanoscale rods. Our analysis shows that GBs play a destabilizing role in which the critical wavelength for the instability decreases with increasing the GB energy. We complement our theoretical model with phase field simulations, which reveal that the time to pinch-off decreases with increasing the GB energy. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Computational Materials Science & Engineering, Modeling and Simulation |