Disconnection Dynamics and Grain Boundary Kinetics: their surprising effects on microstructural evolution

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• Professor David Srolovitz, The University of Hong Kong
• Friday 09 February 2024, 14:00-15:00
• Department of Engineering - LT2.

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I begin with a pedagogical introduction to how grain boundaries and other interfaces in crystalline materials move. My approach focuses on bicrystallography and the special types of line defects that only exist at interfaces, i.e., disconnections. Disconnections have both step character and dislocation character. Their step nature implies that their motion leads to interface motion and their dislocation nature means that they interact with and are sources of stress. The main focus of this presentation is how to apply this modern understanding of how interfaces move to the evolution of microstructure and morphology. I will show several examples from atomic-scale simulations and microstructure evolution simulations based on front tracking and phase field. I will show some surprising results that demonstrate that the application of cyclic stress and/or temperature drive grain boundary migration in particular directions and accelerate grain growth

This talk is part of the Engineering - Mechanics Colloquia Research Seminars series.

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