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About this Abstract
Meeting 2027 TMS Annual Meeting & Exhibition
Symposium Chemistry and Physics of Interfaces
Presentation Title Grain Boundary Migration at Diffusive Time Scales
Author(s) Marco Salvalaglio
On-Site Speaker (Planned) Marco Salvalaglio
Abstract Scope Grain-boundary (GB) migration governs microstructural evolution. It is mediated by disconnection flow driven by capillarity and elasticity. Over long timescales, diffusive processes strongly affect GB dynamics, yet with implications that remain only partially understood. This presentation will illustrate fundamental mechanisms governing GB migration on diffusive timescales through phase-field crystal modeling complemented by molecular dynamics simulations and experiments. The microscopic structure of GBs is shown to affect their mobility, with asymmetric GBs exhibiting directional migration under an oscillating driving force and oscillating temperature. How mechanical deformation in the plastic regime can induce GB migration at room temperature is then discussed. Finally, the impact of vacancy diffusion-enabled disconnection climb on GB migration, grain growth, and grain-growth stagnation is discussed using an extended PFC model. Together, these results contribute to a fundamental understanding that is useful for tailoring the evolution of the microstructure via thermomechanical processing.
Proceedings Inclusion? Planned:
Keywords Computational Materials Science & Engineering, Modeling and Simulation, Thin Films and Interfaces

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