The isochronal recovery of deformation-induced defects in ordered L12 Al67Mn8Ti25 was investigated by means of positron lifetime measurements and in situ electron transmission microscopy. Three recovery stages of the positron lifetime were observed for deformed samples during isochronal annealing. Vacancy migration was suggested to explain the first stage; from room temperature to 200C. The second stage, between 200 and 400C, was attributed to the dissociation of super-dislocations with superlattice intrinsic stacking faults or antiphase boundaries. The third stage, which occurred at up to 800C, was

attributed to the only dissociation scheme of dislocations with antiphase boundary accompanied by a relaxation of the antiphase domain.

Variation of Defects in Deformed L12 Al67Mn8Ti25 Ordered Intermetallic Alloy during Annealing. J.X.Zhang, J.C.Wang, G.X.Hu, J.S.Wu: Journal of Materials Science, 2002, 37[6], 1223-7