The hidden order behind jerky flow

Bharathi, MS and Lebyodkin, M and Ananthakrishna, G and Fressengeas, C and Kubin, LP (2002) The hidden order behind jerky flow. In: Acta Materialia, 50 (11). pp. 2813-2824.

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Abstract

Jerky flow, or the Portevin-Le Chatelier effect, is investigated at room temperature by applying statistical, multifractal and dynamical analyses to the unstable plastic flow of polycrystalline Al-Mg alloys with different initial microstructures. It is shown that a chaotic regime is found at medium strain rates, whereas a self-organized critical dynamics is observed at high strain rates. The cross-over between these two regimes is signified by a large spread in the multifractal spectrum. Possible physical mechanisms leading to this wealth of patterning behavior and their dependence on the strain rate and the initial microstructure are discussed.

Item Type:	Journal Article
Publication:	Acta Materialia
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Aluminum Alloys;Jerky Flow;Dynamic Phenomena;Chaos;Self-Organized Criticality.
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	12 Aug 2009 04:51
Last Modified:	19 Sep 2010 05:01
URI:	http://eprints.iisc.ac.in/id/eprint/18352

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