On the existence of superlattice intrinsic stacking fault-superlattice extrinsic stacking fault coupled pairs in an LI₂ alloy

Abstract

Double-faulted ribbons of stacking faults on the same {111} plane have been found in a L1₂ pseudobinary Ni₃Ge-Fe₃Ge compound. They stem from the interaction of coplanar 〈110〉 superdislocations giving rise to 〈112〉 dislocations, which subsequently dissociate into three identical ⅓ 〈112〉 Shockley partials. It is shown that, provided that a larger core relaxation of the ⅓ 〈112〉 partial dislocations is assumed, the threefold dissociated configuration has a lower energy than the antiphase-boundary dissociated configuration.