About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
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Presentation Title |
Interactions between Interfacial Disconnections and Facet Junctions: Implications for Faceting and Boundary Evolution |
Author(s) |
Douglas L. Medlin, Chris Barr, James E. Nathaniel, Elton Y. Chen, Ping Lu, David P. Adams, Rémi Dingreville, Brad Boyce |
On-Site Speaker (Planned) |
Douglas L. Medlin |
Abstract Scope |
Interfacial line defects and their interactions are critical to understanding metastability and disorder in non-ground-state boundaries. Here, we consider the interplay between two types of interfacial line defect: disconnections and facet junctions. We begin by reviewing how such defects accommodate deviations in misorientation and inclination from ideal, low Σ configurations, illustrating this discussion with examples from atomic-resolution observations and simulations of boundaries vicinal to BCC Σ5 <001> and FCC Σ3 <111>. One question is how disconnections, which may be present to accommodate deviations in misorientation, interact with facet junctions. Our observations suggest that such disconnections can pin to the facet junctions and, in doing so, dictate the grain-boundary faceting length-scale. Implications for these interactions on dynamic behavior are discussed in the context of electron microscopic observations of grain boundary facet evolution under in-situ ion irradiation. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. |
Proceedings Inclusion? |
Planned: |