Publications by authors named "Caihao Qiu"
Article Synopsis
- Near-rigid-body grain rotation is significant during processes like grain growth, recrystallization, and plastic deformation in nanocrystalline materials, but its mechanisms have been unclear for decades.
- New evidence shows that grain rotation happens due to the movement of disconnections along grain boundaries in platinum thin films.
- Advanced microscopy techniques reveal a statistical link between grain rotation and changes in grain size, highlighting the role of shear-coupled grain boundary migration in this phenomenon.
Article Synopsis
- - The study shows that grain boundaries (GBs) act like Brownian ratchets, meaning they can move in a specific direction when subjected to certain oscillating forces or heat cycling, unlike symmetric GBs which do not show this behavior.
- - Researchers used molecular dynamics and phase-field crystal simulations to investigate various types of GBs in both bicrystal and polycrystalline structures, confirming their findings with real-time experiments.
- - A Markov chain model was used to analyze the GB ratchet phenomenon and its potential impact on materials processing and the manipulation of microstructures.
Grain rotation is commonly observed during the evolution of microstructures in polycrystalline materials of different kinds, including metals, ceramics, and colloidal crystals. It is widely accepted that interface migration in these systems is mediated by the motion of line defects with step and dislocation character, i.e.
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