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Dislocation configurations in long period ordered Ag3Mg are examined using transmission electron microscopy. A study of order and stacking faults observed shows conclusively that the stacking fault energy in this alloy is much lower than the order fault energy. Theoretical implications of the deformation behaviour are then examined. It is proposed that plastic deformation should take place by either twinning or propagation of widely extended stacking fault through several domains. Some preliminary results on single crystals tested in compression seem to support this model.
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Vanderschaeve et al. (1972) studied this question.
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