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The elastic-plastic transition in nanoparticle collisions.
Emmanuel N Millán1, Diego R Tramontina2, Herbert M Urbassek3
1CONICET and Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, 5500 Argentina.
Physical Chemistry Chemical Physics : PCCP
|October 13, 2015
Summary
The minimum impact velocity for nanoparticles (NPs) to deform, or become plastic, increases as particle size decreases. This finding is crucial for understanding granular matter behavior.
Area of Science:
- Materials Science
- Physics
- Nanotechnology
Background:
- Nanoparticles (NPs) typically interact elastically during low-velocity collisions, with fusion occurring due to van der Waals forces.
- Defect generation and plasticity are not observed in NPs at low impact velocities.
Purpose of the Study:
- To determine the critical velocity (vc) at which nanoparticles (NPs) begin to generate defects and exhibit plasticity.
- To establish the elastic-plastic transition threshold for NPs, essential for granular matter modeling.
Main Methods:
- Simulations using the generic Lennard-Jones interaction potential.
- Investigating the relationship between impact velocity, NP radius, and defect generation.
Main Results:
- The critical velocity (vc) for inducing plasticity in NPs was found to increase significantly as the NP radius decreases.
- Simulations revealed a size-dependent elastic-plastic transition in NPs.
Conclusions:
- A new model based on dislocation emission in the contact zone was developed.
- This model quantitatively explains the observed size dependence of the elastic-plastic transition in NPs, diverging from current models.
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