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.
Acta_Materialia.pdf - Published Version
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|
|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|
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