Crossover in the scale-free statistics of acoustic emission associated with the Portevin-Le Chatelier instability
| Autor: | Denis Entemeyer, Tatiana Lebedkina, Mikhail Lebyodkin, Y. Bougherira, I.V. Shashkov |
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| Přispěvatelé: | Togliatti State University, Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux (LEM3), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Unité de Recherche en Optique et Photonique, UROP – CDTA, Université Ferhat Abbas, Institute of Solid State Physics (ISSP, RAS), Russian Academy of Sciences [Moscow] (RAS), National University of Science and Technology (MISIS) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Self-organization
Materials science Crossover 02 engineering and technology 01 natural sciences Instability Stress (mechanics) Condensed Matter::Materials Science 0103 physical sciences Statistics [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] General Materials Science Portevin-Le Chatelier effect 010306 general physics Plastic deformation Mechanical Engineering Metals and Alloys Portevin–Le Chatelier effect 021001 nanoscience & nanotechnology Condensed Matter Physics Acoustic emission Mechanics of Materials Macroscopic scale Dislocation Deformation (engineering) 0210 nano-technology acoustic emission |
| Zdroj: | Scripta Materialia Scripta Materialia, Elsevier, 2018, 148, pp.47-50. ⟨10.1016/j.scriptamat.2018.01.017⟩ |
| ISSN: | 1359-6462 |
| DOI: | 10.1016/j.scriptamat.2018.01.017⟩ |
| Popis: | International audience; The acoustic emission accompanying plastic deformation obeys scale-free statistics reflecting avalanche-like dis-location motion. This feature holds out for the macroscopically unstable deformation of alloys. However, stress serrations display peaked distributions at low enough strain rates. This occurrence of a characteristic macroscopic scale was supposed to result from the synchronization of dislocation avalanches. In the present work, the synchronization mechanism is studied using statistical analysis of different subsets of acoustic events. A crossover in the power-law exponents is detected for the events occurring during deep stress drops. It is ascribed to a transition from chaining to overlapping dislocation avalanches. |
| Databáze: | OpenAIRE |
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