Elastic stability of dislocations in FeAl alloys and Fe3Si was examined with respect to the formation of jog pair(s) on a straight dislocation as well as the kink-pair formation. Dislocation configurations from annealed and deformed microstructures available in the literature are consistent with the predictions based on elastic instability. The difference in the formation enthalpy between a jog pair and a kink pair was obtained, and the activation enthalpy of a jog-pair pinning mechanism for edge dislocations was prescribed. Discussion is given on the driving forces for the pinning mechanisms, including the role of inhomogeneous internal stress in FeAl single crystals.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys