Physical scaling in microstructures and avalanches of dislocation by Dislocation Dynamics simulations

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Summary

Dislocation dynamics simulations were performed to study the impact of dislocation density and crystal orientation on avalanche statistics in bulk fcc Cu. The results show that the power-law exponent is independent of dislocation density and loading conditions, but the cutoffs of the power-law regime are affected by these parameters.

Highlights

• Dislocation dynamics simulations were used to study avalanche statistics in bulk fcc Cu.
• The power-law exponent is independent of dislocation density and loading conditions.
• The cutoffs of the power-law regime are affected by dislocation density and loading conditions.
• The avalanche statistics are anisotropic and depend on the crystal orientation.
• The dislocation density controls the scaling of the power-law truncation.
• The triggering stresses at the origin of avalanches are correlated with the dislocation microstructure.
• The results provide a physical justification for the functional form used to model avalanche statistics.

Key Insights

• The dislocation density has no impact on the power-law exponent, but affects the cutoffs of the power-law regime, indicating that the dislocation density controls the scaling of the power-law truncation.
• The loading conditions, such as the crystal orientation, affect the avalanche statistics, indicating that the avalanche statistics are anisotropic and depend on the crystal orientation.
• The dislocation microstructure plays a crucial role in determining the triggering stresses at the origin of avalanches, indicating that the dislocation microstructure controls the onset of avalanches.
• The results provide a physical justification for the functional form used to model avalanche statistics, indicating that the power-law regime is a result of the dislocation dynamics.
• The avalanche statistics are affected by the dislocation density and loading conditions, indicating that the avalanche statistics are not universal and depend on the specific conditions.
• The dislocation dynamics simulations provide a useful tool for studying the avalanche statistics in bulk fcc Cu, allowing for a detailed analysis of the dislocation microstructure and its impact on the avalanche statistics.
• The results have implications for understanding the plastic deformation of materials and the role of dislocations in determining the mechanical properties of materials.

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Citation

Aissaoui, M., Kahloun, C., Salman, O. U., & Queyreau, S. (2024). Physical scaling in microstructures and avalanches of dislocation by Dislocation Dynamics simulations (Version 1). arXiv. https://doi.org/10.48550/ARXIV.2412.21115