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Article Dans Une Revue Acta Materialia Année : 2002

The hidden order behind jerky flow

Résumé

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 found at high strain rates. The crossover between these two regimes is signified by a large spread in the multifractal spectrum. Possible mechanisms leading to this wealth of patterning behavior and their dependence on the strain rate and the initial microstructure are discussed.

Dates et versions

hal-00119285 , version 1 (11-12-2006)

Identifiants

Citer

M.S. Bharathi, M. Lebyodkin, G. Ananthakrishna, C. Fressengeas, L.P. Kubin. The hidden order behind jerky flow. Acta Materialia, 2002, 50, pp.2813-2824. ⟨10.1016/S1359-6454(02)00099-X⟩. ⟨hal-00119285⟩
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