Transmission Electron Microscope Observation of Dislocations in Ordered Intermetallic Alloys and the Flow Stress Anomaly

ABSTRACTIt is only within the last five years that, with the increasing interest of several specialized groups, the amount of accurate TEM information on dislocations in ordered alloys, and in particular in theL12 structure, has become significant. Our knowledge on superdislocation cores related todeformation under various temperature and deformation modes, is now sufficiently documented in order to be critically reviewed and this is the object of the present contribution.