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Intermittent microplasticity in the presence of a complex microstructure
Summary
Researchers investigated intermittent microplasticity -- the jerky, avalanche-like nature of plastic deformation at small scales -- in Al-Cu binary alloys with varying microstructural complexity, demonstrating a gradual transition from scale-free power-law statistics to scale-dependent exponential distributions as incoherent precipitates are introduced, with non-Gaussian dislocation interactions persisting across different microstructures.
We demonstrate the gradual shift from scale-free intermittent microplasticity to a scale-dependent behavior via the introduction of a variety of microstructural features within the Al-Cu binary alloy system. As long as the obstacles to dislocation motion remain shearable, the statistics of intermittent microplasticity has fat-tailed contributions. The introduction of incoherent precipitates leads to a complete transition from scale-free power-law scaling to an exponential and scale-dependent distribution. These results demonstrate how non-Gaussian interactions survive across different microstructures and further suggest that characteristic microstructural length scales and obstacle pinning-strengths are of secondary importance for the intermittency statistics, as long as dislocations can shear their local environment.
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