Abstract
A disruption mechanism for the long-range atomic order in alloys with the L12 superlattice is examined. The disruption is caused by an accumulation of superdislocations upon plastic deformation. The rate of increase of the antiphase-boundary area resulting from multiplication of superdislocations is estimated for the cases where the spacing between superpartial dislocations is either constant or strain-dependent. Equations are derived for the rate of change of the degree of long-range order as single-crystalline L12-superlattice alloys are subject to deformation.
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