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Open AccessArticle

Scaling in the Local Strain-Rate Field during Jerky Flow in an Al-3%Mg Alloy

1
Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS, Université de Lorraine, Arts & Métiers ParisTech, 7 rue Félix Savart, 57070 Metz, France
2
Unité de recherche en optique et photonique (UROP), CDTA, Université de Sétif1, El Bez, Sétif 1900, Algeria
3
Center of Excellence “LabEx DAMAS”, Université de Lorraine, 7 rue Félix Savart, 57070 Metz, France
*
Author to whom correspondence should be addressed.
Metals 2020, 10(1), 134; https://doi.org/10.3390/met10010134
Received: 25 November 2019 / Revised: 12 January 2020 / Accepted: 13 January 2020 / Published: 16 January 2020
(This article belongs to the Special Issue Trends in Plasticity of Metals and Alloys)
Jerky flow in alloys, or the Portevin-Le Chatelier effect, presents an outstanding example of self-organization phenomena in plasticity. Recent acoustic emission investigations revealed that its microscopic dynamics is governed by scale invariance manifested as power-law statistics of intermittent events. As the macroscopic stress serrations show both scale invariance and characteristic scales, the micro-macro transition is an intricate question requiring an assessment of intermediate behaviors. The first attempt of such an investigation is undertaken in the present paper by virtue of a one-dimensional (1D) local extensometry technique and statistical analysis of time series. The data obtained complete the missing link and bear evidence to a coexistence of characteristic large events and power laws for smaller events. The scale separation is interpreted in terms of the phenomena of self-organized criticality and synchronization in complex systems. Furthermore, it is found that both the stress serrations and local strain-rate bursts agree with the so-called fluctuation scaling related to general mathematical laws and unifying various specific mechanisms proposed to explain scale invariance in diverse systems. Prospects of further investigations including the duality manifested by a wavy spatial organization of the local bursts of plastic deformation are discussed. View Full-Text
Keywords: Portevin-Le Chatelier effect; aluminum alloys; local extensometry; avalanches; self-organized criticality; synchronization; fluctuation scaling Portevin-Le Chatelier effect; aluminum alloys; local extensometry; avalanches; self-organized criticality; synchronization; fluctuation scaling
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Lebyodkin, M.; Bougherira, Y.; Lebedkina, T.; Entemeyer, D. Scaling in the Local Strain-Rate Field during Jerky Flow in an Al-3%Mg Alloy. Metals 2020, 10, 134.

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