Abstract
A detailed computer analysis has been made of the behavior associated with the passage of pairs of superlattice dislocations on neighboring parallel slip planes for the specific case of the Fe3Si alloy. The treatment has been carried out for superlattice screw and edge dislocations of like and unlike sign for a series of vertical passing distances. In particular, the equilibrium separation between the individual ordinary dislocations constituting the superlattice dislocation has been determined as a function of distance between the pair of superlattice dislocations. In addition, the passing forces as well as the cross slip and climb forces associated with the dislocations have been calculated. It has been found that cross slip of superlattice screw dislocations with mutual annihilation, if they are of unlike sign, will occur for passing separations of 100 Å or less. Superlattice edge dislocations can, however, be passed by one another at much closer distances, which results in the uncoupling of the superlattice dislocation. Furthermore, the extension of the superlattice dislocations oscillates strongly as they pass one another. All of these results are in general agreement with observations obtained with the Fe3Si superlattice.
Published Version
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