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About this Abstract
Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Chemistry and Physics of Interfaces
Presentation Title Grain Boundary Migration and Shear Accommodation Controlled by Disconnection Mobility
Author(s) Spencer Thomas, Jason Trelewicz
On-Site Speaker (Planned) Jason Trelewicz
Abstract Scope While the disconnection mechanism has been established as a powerful descriptor for grain boundary (GB) behaviors, the relative contributions from disconnection nucleation and migration to mode selection and the effective GB mobility are yet to be fully resolved. This work illustrates the role of disconnection mobility in mode selection and GB mobility using the Σ5(310) symmetric tilt GB. Higher order disconnection modes are shown to be restricted by low disconnection mobility, despite nucleation enthalpies comparable to the primary mode. When secondary disconnections do form, they tend to pile up, roughening the boundary. These low-mobility disconnections serve as nucleation sites for more disconnections, greatly reducing the effective barrier to migration. The evolution of GB mobility with accumulating disconnections implies that GB behavior is not only sensitive to the present conditions on the GB, but also past migration and defect absorption thereby potentially deviating from predictions based on initially flat bicrystals.
Proceedings Inclusion? Planned:
Keywords Modeling and Simulation, Thin Films and Interfaces, Other

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