Self-Organization in Plasticity of Metals and Alloys

Dear Colleagues,

Numerous studies over the past three decades have shown that the self-organization of crystal defects is a fundamental property of plastic flow in solids, which leads to phenomena similar to those observed in complex systems of various natures, such as deterministic chaos, patterning, avalanche dynamics, and synchronization. In plasticity, these phenomena are often confined to mesoscopic scales and do not manifest themselves on the macroscopic scale of mechanical behavior of bulk samples. This constraint ensures the success of the continuous approach to plasticity, in which the transition from the microscopic description of the motion of individual dislocations to the macroscopic behavior of materials is based on an appropriate averaging. However, this approach becomes insufficient when the local heterogeneity of plastic deformation cannot be neglected, which is more and more often the case in current technological trends, be it the miniaturization of devices or the elaboration of materials with complex structures. Moreover, these phenomena can appear on a macroscopic scale, as in the phenomenon of jerky flow. Thus, the consideration of collective effects in the "micro–macro" transition constitutes a key element to further progress in the understanding and modeling of mechanical behavior of solids. This challenge gives rise to an intricate problem. Depending on the material and the testing conditions, the collective dynamics of defects emerge at different mesoscopic scales and involve various self-organization phenomena. In addition to this fundamental complexity, an unexpected consequence of the multiscale nature of the problem is that depending on the recorded characteristics and the scales assessed, it is possible to come up with different views of collective behavior. The aim of this Special Issue is to collect in one place various findings, often contradictory, and various approaches to this challenging problem.

Dr. Mikhaïl A. Lebyodkin
Dr. Jamieson Brechtl
Guest Editors

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• plastic deformation
• self-organization
• collective dynamics of defects
• spatial structures in plasticity of solids
• multi-scale experiment and modeling
• intermittence
• dynamical chaos
• dislocation avalanches
• dislocation patterning
• strain localization patterns
• metals and alloys

Title: Signatures of strain localization and dislocation self-organization in acoustic emission time-series
Authors: Alexey Vinogradov
Affiliation: Kumamoto University, Japan