Abstract
A stochastic model for the simulation of dynamic strain aging is presented. In this model the breakaway process of dislocation double loops from an obstacle and the diffusion of foreign atoms towards those double loops rules the deformation behaviour of the specimen. With this model computer simulations of tensile tests showing the Portevin-Le Chatelier effect were carried out. Two different aging models, the line strengthening model and the forest strengthening model, were tested. For constant dislocation densities of mobile dislocations and forest dislocations, regular serrations appear for special cross head velocities only for the line strengthening model. The results of the forest strengthening model are not in agreement with the experiment. Together with a model for the dislocation evolution complete stress-strain curves were simulated. Computed stress-strain curves for different test temperatures are in good agreement with experimental results.
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