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Nontrivial scaling exponents of dislocation avalanches in microplasticity
Summary
This physics study analyzed the statistical patterns of small-scale deformation events (dislocation avalanches) in metals to test theoretical models of material plasticity. The research is in materials physics and is not related to environmental microplastics.
Intermittency during plastic flow is one example of avalanches in critically evolving systems. Such fluctuations are typically assessed statistically with scale-free distributions. Theory and simulations have studied this behavior in detail, generally arguing for two prominent models (mean-field approach or a jamming-unjamming picture) that are characterized via distinctly different avalanche scaling exponents. In this paper, the authors show experimentally how scaling exponents for the same single crystalline metal can admit a variety of scaling exponents that encompass both models. Depending on both intrinsic and extrinsic factors, their experiments reveal how the scaling exponents are nontrivial and therefore not universal.
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