About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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| Presentation Title |
Decoupling Effects of Complexion Nucleation and Propagation on Driving Abnormal Grain Growth Using Monte Carlo Grain Growth Simulations |
| Author(s) |
Surui Huang, Ben Zalatan, Brian Chen, Martin Harmer, Christopher J. Marvel |
| On-Site Speaker (Planned) |
Christopher J. Marvel |
| Abstract Scope |
Grain boundary complexion transitions are theorized to drive abnormal grain growth (AGG) via nucleation and propagation of interconnected high mobility complexions. However, it is unclear how complexions most realistically propagate through a coarsening microstructure and eventually lead to AGG. In this work, 3D Monte Carlo Potts grain growth models were employed to investigate the relative importance of complexion nucleation and propagation to simulate AGG behaviors typically seen in rare earth doped MgAl2O4. The ratio between spatially random and propagated complexion nuclei was specifically compared, as well as the percentage of complexion spread into neighboring untransitioned boundaries through triple junctions. The main result was that higher degrees of complexion propagation and spread led to higher abnormal grain relative volumes, abnormal grain numbers, and abnormal grain volume fractions. This experimentally-motivated work provides an improved understanding of complexion propagation, which will aid future experimental studies of complexion-dependent microstructure evolution. |