Dislocations in ordered Ni3Ta were examined by transmission electron microscopy. The [100] super-dislocations dissociated into two dislocations, both of which presumably consisted of closely-spaced partial dislocations. The [001] super-dislocations dissociated into two dislocations, one of which was a partial dislocation while the other presumably consisted of three very closely-spaced partial dislocations. These dissociations seemed to occur when the antiphase boundary energy was much larger than the stacking fault energy. The dissociation of the [100] super-dislocations permitted the estimation of the order fault energy; which was found to be about 130mJ/m2.

Unusual Dissociation of Dislocations in Ni3Ta. Y.Hayashi, P.Delavignette, S.Amelinckx: Physica Status Solidi B, 1970, 42[2], 637–44