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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Plastic flow in polycrystal states in a binary mixture.

Toshiyuki Hamanaka¹, Hayato Shiba, Akira Onuki

¹Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|June 4, 2008

Summary

This summary is machine-generated.

This study explores particle dynamics in sheared binary mixtures. Large stress fluctuations at grain boundaries decrease as the system transitions from polycrystal to glass states.

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Area of Science:

Condensed matter physics
Materials science
Computational physics

Background:

Polycrystal states in binary mixtures exhibit complex dynamics under shear.
Understanding particle behavior at grain boundaries is crucial for material properties.

Purpose of the Study:

To investigate the dynamics of sheared polycrystal states in 2D binary mixtures.
To analyze the influence of large particle composition and shear rate on phase transitions.
To characterize stress fluctuations and their relation to structural changes.

Main Methods:

Molecular dynamics simulations were employed to model the system.
System parameters included binary mixture composition (c) and shear rate (gamma).
Local crystal orientation (alpha(j)(t)) and disorder (D(j)(t)) variables were used for analysis.

Main Results:

Large stress fluctuations were observed at grain boundaries due to cooperative sliding motions.
These fluctuations decreased significantly upon transition from polycrystal to glass states.
The study visualized dynamic processes using local orientation and disorder metrics.

Conclusions:

Sheared polycrystal dynamics are characterized by cooperative grain boundary sliding releasing stored elastic energy.
The transition from polycrystal to glass involves a reduction in dynamic stress fluctuations.
The findings provide insights into the mechanical behavior and phase transitions of granular materials.