Variation of defects in deformed L12 Al67Mn8Ti25 ordered intermetallic alloy during annealing

The isochronal recovery of deformation-induced defects in L12 Al67Mn8Ti25 ordered alloy was investigated by positron lifetime measurement and in situ electron transmission microscopy. Three recovery stages of the positron lifetime were observed for the deformed samples during isochronal anneals. Vacancy migration was proposed to explain the first stage from room temperature to 200°C; The second stage, between 200 and 400°C, was assigned to be the dissociation of superdislocations with superlattice intrinsic stacking fault (SISF) or antiphase boundary (APB); The third stage, occurring up to 800°C, was attributed to the only dissociation scheme of dislocation with antiphase boundary (APB) accompanied by a relaxation of antiphase domain.