Computer Simulation of Dislocation Motion through a Flexible and Reactionable Dislocation Forest of Different Density in NaCl and Mg Crystals

Using computer simulation methods, the influence of the structure of the forest dislocations, their flexibility and their ability to react on the transparency of the dislocation forest for the glide dislocations at different dislocation densities are analysed in NaCl and Mg crystals. It is found that provided a considerable number of junctions is formed and the forest flexibility is insignificant, the forest transparency decreases. If the flexibility of the forest dislocation dominates over their ability to form junctions, the dislocation forest transparency increases. It is shown that the forest dislocation displacement and the value of the dislocation junction change in a self-consistent way as the forest dislocation density changes. This self-consistency ensures the fulfilment of the proportionality between the flow stress and the square root of the forest dislocation density. [Russian Text Ignore]