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Crossover in the dynamics of jerky flow in Al-Mg polycrystals

Ananthakrishna, G and Brechet, Y and Fressengeas, C and Kubin, LP and Lebyodkin, M (2000) Crossover in the dynamics of jerky flow in Al-Mg polycrystals. In: Zeitschrift fur Angewandte Mathematik und Mechanik, 80 (2). pp. 415-416.

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Abstract

Jerky flow in Al-Mg alloys is investigated through the statistics of the stress drops size, and through a dynamic analysis of the stress vs. time records. At low applied strain rate levels, the peaked distribution is associated with chaotic dynamics, while at higher strain rates, the unstable behavior is characterized by power law distributions reminiscent of critical dynamics. In addition, the bands of localized plastic deformation shift from stationary to propagating. This crossover is discussed in terms of a nonideal model of jerky flow, with a range of negative strain rate sensitivity and spatial interactions of varying strength

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Wiley-VCH
Keywords: aluminium alloys;chaos;magnesium alloys;plastic flow;Portevin Le Chatelier effect;stress strain relations
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 26 Jul 2007
Last Modified: 27 Aug 2008 12:43
URI: http://eprints.iisc.ernet.in/id/eprint/10320

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