Statistical behaviour and strain localization patterns in the Portevin-Le Chatelier effect

Statistics of the stress drops associated with the Portevin-Le Châtelier effect in an AlMg alloy were studied both experimentally and theoretically. It was shown that the character of the statistics changes from a peaked distribution of the stress drop magnitudes to a monotonically decreasing one as the imposed strain rate or the temperature are increased. A discrete model based on a micromechanically founded local constitutive equation …