About this Abstract |
Meeting |
6th International Congress on 3D Materials Science (3DMS 2022)
|
Symposium
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6th International Congress on 3D Materials Science (3DMS 2022)
|
Presentation Title |
Plateau-Rayleigh Instability with a Grain Boundary Twist |
Author(s) |
Omar Marwan Hussein, Keith Coffman, Shen Dillon, Fadi Abdeljawad |
On-Site Speaker (Planned) |
Omar Marwan Hussein |
Abstract Scope |
High-precision manufacturing techniques have enabled the fabrication of three-dimensional materials architectures with intricate nanoscale features, including nanolattices and nanowires. However, the microstructural stability of such nanoscale morphologies remains poorly understood. Recent experimental findings have revealed a morphological instability, in which polycrystalline nanoscale rods/ligaments break up into spatially isolated structures; a behavior that is reminiscent of the Plateau-Rayleigh instability observed in liquids. Here, we present a theoretical and a 3D Phase-Field computational studies to investigate the mechanisms controlling such pinch-off instabilities in polycrystalline nanoscale morphologies. An analytical model is used to derive a stability surface in terms of grain boundary and free surface energies, which demarcates stable and unstable perturbations. Computational studies are used to reveal self-similar scaling describing the critical time to pinch-off. In broad terms, our results show that the thermodynamic and kinetic aspects of this nanoscale instability in solids are mechanistically different from the classic Plateau-Rayleigh model. |
Proceedings Inclusion? |
Definite: Other |