Mechanical behavior of AA1100 aluminum alloy processed by multiple compressions in a channel die was modeled on the basis of a generalized three-dimensional dislocation-density-based two-phase composite model. The simulated yield stress values were compared with the experimental data obtained by the multiple compressions in a channel die after several passes. A good agreement was found between the experimental and simulated yield stress values. The results showed that the yield stress of the ultra fine grained materials, produced by multiple compressions in a channel die, can reasonably be simulated using a dislocation-density-based two-phase model. Moreover, the experimentally determined average grain size of the studied material correlates well with that predicted by the model. Therefore, it can be said that the dislocation-based model could be used to predict the average grain size of the multiple compressed materials in a channel die.

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