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Plasticity of a colloidal polycrystal under cyclic shear
Elisa Tamborini1, Luca Cipelletti1, Laurence Ramos1
1Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France and CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France.
Physical Review Letters
|August 30, 2014
Summary
Plasticity in colloidal polycrystals involves ballistic grain boundary motion. Dynamics initially age like glassy materials but reach a steady state, with crossover times decreasing at larger scales, suggesting hierarchical organization.
Area of Science:
- Soft matter physics
- Materials science
- Colloidal systems
Background:
- Colloidal polycrystals exhibit complex dynamics under deformation.
- Understanding grain boundary behavior is crucial for material plasticity.
- Glassy dynamics and aging phenomena are observed in disordered systems.
Purpose of the Study:
- Investigate the plasticity of colloidal polycrystals.
- Characterize grain boundary motion under shear deformation.
- Explore the relationship between dynamics, aging, and length scale.
Main Methods:
- Confocal microscopy for visualizing microstructure.
- Time-resolved light scattering for dynamics analysis.
- Applying thousands of shear deformation cycles.
Main Results:
- Grain boundary motion is ballistic with power-law velocity distributions.
- Shear-induced dynamics exhibit an aging regime followed by a steady state.
- Crossover time decreases with increasing probed length scale.
Conclusions:
- Colloidal polycrystal plasticity involves ballistic grain boundary motion.
- Dynamics show aging behavior analogous to glassy materials.
- Hierarchical organization of grain boundary dynamics is suggested by length-scale-dependent crossover times.
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