PROPAGATION OF DISLOCATIONS IN LONG PERIOD ORDERED ALLOYS

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Abstract
From geometrical considerations it is shown that in long period ordered alloys some partial dislocations exist, leaving behind only a stacking fault without destroying the chemical order. Providing that the stacking fault energy is low enough, theoretical implications of the deformation behaviour are examined. It is proposed that plastic deformation should take place either by twinning or propagation of widely extended stacking faults through several domains. A simple mechanism for crossing over domain boundaries is proposed : partial dislocations have to glide together on adjacent layers, in the sense that some convenient dislocation multipole has to be nucleated at the boundary. Some physical consequences are drawn from that model

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