Plastic instabilities associated with the Portevin - Le Chatelier (PLC) effect will be examined with special attention to relaxation oscillations behaviour. The types of serrations are studied and interpreted in terms of a constitutive flow model which takes into account stress dependent changes accompanying a strain rate changes. The experimental data in aluminium - magnesium industrial dilute alloys are discussed in the light of the present study and a new analysis vision of PLC effect is proposed. Emphasis is put on the connection between the different types of instabilities and the relaxation oscillations behaviour. The spatial correlation in the case of A and B types of PLC instabilities is investigated and discussed with reference to A9G5 alloy.


Plastic instabilities ; Portevin - Le Chatelier effect; relaxation oscillations; deformation bands; spatial correlation

Texte intégral :

PDF (English)


- Chihab K., Estrin Y., Kubin L.P. and Vergnol J., "The kinetics of the Portevin-Le Chatelier bands in an Al-5%Mg alloy", Scripta Metall., 21 (1987), pp. 203-208.

- Kubin L.P., Chihab K. and Estrin Y., "Nonuniform plastic

deformation and the Portevin-Le Chatelier effect" NATO ASI Series E, App. Sci., 121, (1987), pp. 220-236.

- Cuddy L.J. and Leslie W.C., "Some aspects of serrated yielding in substitutional solid solutions of iron", Acta Metall., 20, (1972), pp. 1157-1167.

- Korbel A. and Dybiec H., "The problem of the negative strain rate sensitivity of metals under the PLC deformation conditions", Acta Metall., 29, (1981), pp. 89-93.

- Chihab K., Baccouche M. et Bouabdallah K., "Comportement des alumags dilues en déformation plastique", Ann. Chim. Sc. Mat., Vol. 24, n°1, (1999), pp. 47-55.

- Chihab K., Bouabdallah K. et Baccouche M., "Caractéristiques de l'écoulement plastique instable dans les alliages Al-Mg dilués", SF2M, J. d'Auto., Paris, 27-29 Oct. 1998, p. 97.

- Chihab K. et Bouabdallah K., "Influence de l'anisotropie structurale sur la plasticité nonuniforme de type Portevin-Le Chatelier", Ann. Chim. Sc. Mat., vol. 25 (3), (2000), p. 171.

- Kubin L.P. and Estrin Y., "The Portevin-Le Chatelier effect in deformation with constant stress rate", Acta Metall., 33, (1985), pp. 397-407.

- Estrin Y. and Kubin L.P., "Collective dislocation behaviour in dilute alloys and the Portevin-Le Chatelier effect", J. Mech. Behav. of Metals, 2, (1990), pp.255-292.

- Chihab K. et Kubin L.P., "On the mechanical response of materials with negative strain rate sensitivity", First Arab mechanics congress, Damascus, 1-3 June 1997, Vol. 2, pp. 1-7.

- Pink E. and Grinberg A., "Stress drops in serrated flow curves of Al-5Mg", Acta Metall., 30, (1982), pp. 2153-2160.

- Penning P., "Mathematics of the Portevin-Le chatelier effect", Acta Metall., 20, (1972), pp.1169-1175.

- Kubin L.P., Chihab K. and Estrin Y., "The rate dependence of the Portevin-Le Chatelier effect", Acta Metall., 36, (1988), pp. 2707-2718.


  • Il n'y a présentement aucun renvoi.


Direction des Publications et de l'animation scientifique

Université des Frères Mentouri Constantine 1. Route Ain El-Bey. 25000. Algérie.