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Published on: May 20, 2014
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Shear-assisted grain coarsening in colloidal polycrystals.
Wei Li1, Yi Peng2, Yongjun Zhang3
1Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, China.
Summary
This study visualizes grain growth in colloidal polycrystals using single-particle kinetics. It reveals new insights into dynamic abnormal grain growth and shear-induced melting, crucial for materials engineering.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Soft Matter Physics
Background:
- Grain growth under shear annealing is vital for tailoring polycrystalline material properties.
- Microscopic kinetics of grain growth are poorly understood due to challenges in tracking atomic trajectories.
Purpose of the Study:
- To investigate grain growth kinetics using single-particle tracking in colloidal polycrystals under shear.
- To elucidate the mechanisms of normal grain growth (NGG), dynamic abnormal grain growth (DAGG), and shear-induced melting.
Main Methods:
- Utilized video microscopy for single-particle kinetics in colloidal polycrystals.
- Analyzed grain growth phenomena across three distinct shear regimes.
- Visualized grain boundary migration coupled with shear via disconnection gliding.
Main Results:
- Observed distinct grain growth behaviors: NGG (weak shear), melting-recrystallization (strong shear), and DAGG (intermediate shear).
- Demonstrated that DAGG occurs via melting-recrystallization, explaining stress drops in metals.
- Revealed dislocation-mediated grain rotation and sinusoidal variation of melting fraction with grain orientation mismatch.
Conclusions:
- Single-particle kinetics provide unprecedented microscopic insights into shear-driven grain growth.
- The findings offer a mechanistic understanding of DAGG and shear-induced melting.
- This research can guide microstructure engineering for advanced polycrystalline materials.
Keywords:
colloidal crystaldynamic abnormal grain growthgrain rotationmelting–recrystallizationshear-coupled grain boundary migrationMore Related Videos
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