Bharathi, M. S. ; Ananthakrishna, G. ; Lebyodkin, M. ; Fressengeas, C. ; Kubin, L. P. (2002) The hidden order behind jerky flow Acta Materialia, 50 (11). pp. 2813-2824. ISSN 1359-6454
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Official URL: http://www.actamat.org/article/S1359-6454(02)00099...
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.
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|Keywords:||Aluminum Alloys; Jerky Flow; Dynamic Phenomena; Chaos; Self-organized Criticality|
|Deposited On:||21 Sep 2010 17:15|
|Last Modified:||12 May 2011 14:19|
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