WORK-HARDENING IN SUPERLATTICES

The work-hardening in superlattices is critically analyzed based on experimental observations in single crystals of Cu3Au and Ni3Fe (L12 structure). The most important consequences resulting from the existence of superdislocations are the formation of relatively strong recombinations of moving dislocations with attractive trees" and the accumulation of antiphase boundary (APB) tubes produced by non aligned jogs in superdislocations. It is shown that these tubes are stable in edge dislocations at not too high temperatures but do not form in screw dislocations. The consequences of these APB tubes for the dislocation configuration are derived and the resulting work-hardening calculated. The model is able to explain the special features of plastic deformation in superlattices. © 1969."