High-resolution electron microscopy study of the {101¯1} twin boundary and twinning dislocation analysis in deformed polycrystalline cobalt

Twin boundary (TB) and twinning dislocations (TDs) in {101¯1} twins in deformed polycrystalline cobalt (Co) were studied by high-resolution electron microscopy. The {101¯1} TB tends to be flat and a mirror plane. The observed TD was characterized directly from the experimental image by the circuit-mapping method and predicted by the topological model. The observed TD with a localized core can stably exist in {101¯1} twins in Co.