Abstract
The influence of annealing at relatively low temperatures on the dislocations present in a deformed Al5Ti2Fe alloy has been examined by in situ transmission electron microscopy. It is shown that for this material the separation of the partial dislocations constituting the super-dislocations can increase rapidly in a non-recoverable manner during annealing. This variation corresponds to a significant decrease in the antiphase boundary fault energy from that of the deformed state. Such changes in fault energy may be responsible for a dynamic pinning of dislocations that can significantly affect mechanical properties of the material.