L21-ordered Fe59Mn17Al24 (at%) single crystals were in situ strained at either 300 or 700K in a transmission electron microscope. At 300K, the strain was accommodated by the glide of four-fold dissociated super-dislocations, whereas, at 700 K, the strain was accommodated by the glide of a/2<111> partials. Dislocation pile-ups occurred at a/4<111>. thermal antiphase boundaries. Screw super-dislocations frequently cross-slipped when they encountered the thermal antiphase boundaries, while mixed dislocations tended to be pinned at them. This impediment was attributed to the creation of new antiphase boundary segments when dislocations pass through the curvy thermal antiphase boundaries.

In situ TEM Observations of Dislocation/Anti-Phase Boundary Interactions. Y.Liao, I.Baker: Philosophical Magazine, 2011, 91[24], 3242-52