The intermittency of plasticity in an Al3%Mg alloy

Statistics of acoustic emission accompanying plastic deformation and of stress serrations caused by the Portevin-Le Chatelier effect are studied during tension of an Al3%Mg alloy at room temperature. Power-law distributions of acoustic emission reflecting self-organization of dislocations and interm...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-07, Vol.240 (1), p.012009
Main Authors: Bougherira, Y, Entemeyer, D, Fressengeas, C, Kobelev, N P, Lebedkina, T A, Lebyodkin, M A
Format: Article
Language:English
Subjects:
Acoustic emission
Deformation effects
Engineering Sciences
Intermittency
Magnesium base alloys
Mechanics
Mechanics of materials
Physics
Plastic deformation
Plastic flow
Portevin-le Chatelier effect
Power law
Room temperature
Serrated yielding
Strain rate
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Summary:Statistics of acoustic emission accompanying plastic deformation and of stress serrations caused by the Portevin-Le Chatelier effect are studied during tension of an Al3%Mg alloy at room temperature. Power-law distributions of acoustic emission reflecting self-organization of dislocations and intermittency of plastic flow are found, irrespective of the strain rate, both before and after the critical strain for the onset of the serrated flow. In contrast, several regimes including both power-law and peaked distributions are observed at the macroscopic scale of stress serrations, depending on the applied strain rate.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/240/1/012009