About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Processing and Kinetic Phenomena: From Thin Films and Micro/Nano Systems to Advanced Manufacturing
|
Presentation Title |
Grain Growth Redux: beyond Smith, von Neumann, and Mullins |
Author(s) |
David Joseph Srolovitz, Jian Han |
On-Site Speaker (Planned) |
David Joseph Srolovitz |
Abstract Scope |
Our fundamental understanding of normal grain growth (GG) can be largely attributed to Smith, von Neumann, and Mullins. This understanding is based on capillarity-driven grain boundary (GB) migration; the GB velocity (v) is v = mH, where 'm' represents the reduced GB mobility and 'H' denotes the mean GB curvature. The resulting GG is simply the integration of this across all GBs in the polycrystalline microstructure. As such, GG is analogous to soap froth evolution (with adjustments for anisotropy). While this is simple and beautiful, it is too simplistic for more than scaling laws. We now understand that GB properties are strongly influenced by bicrystallography and line defects within the GB; i.e., disconnections (defects with step and dislocation character). This naturally leads to GG process controlled by both capillarity AND elasticity. The ramifications for GG are profound. We present a contemporary perspective on GB migration and its consequences for GG. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Thin Films and Interfaces, |