Multiscale Analysis of Acoustic Emission during Plastic Flow of Al and Mg Alloys: From Microseconds to Minutes

Abstract:

Recent studies of plastic deformation using high-resolution experimental techniques bear witness that deformation processes are often characterized by collective effects emerging on an intermediate scale between the scales describing the dynamics of individual crystal defects or the macroscopic plastic flow. In particular, the acoustic emission (AE) reveals intermittency of plastic deformation in various experimental conditions, which is manifested by the property of scale invariance, a characteristic feature of self-organized phenomena. Some materials, e.g., Al or Mg alloys, display a macroscopic discontinuity of plastic flow due to the Portevin-Le Chatelier effect or twinning. These materials are therefore of special interest for the study of collective effects in plasticity. The present work reviews the results of a multiscale investigation of AE accompanying plastic deformation of such model alloys. The AE is analyzed by methods borrowed from the theory of nonlinear dynamical systems, including statistical and multifractal analyses.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 204-209
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.204
• Online since: May 2014
• Authors: Mikhail Lebyodkin, Ivan V. Shashkov, Tatiana Lebedkina, Vladimir S. Gornakov
• Keywords: Twinning, Multifractal Analysis, Portevin-Le Châtelier Effect, Self-Organization, Statistical Analysis

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