On the dissociation of prism plane superdislocations in Ti3Al

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Abstract
The core structure and the character of a dislocations on prism planes have been studied for room-temperature-deformed polycrystalline Ti3Al using a combination of experimental and computational techniques of transmission electron microscopy. A comparison of experimental and computer-simulated weak-beam images of prism plane a dislocations in Ti3Al indicates that the image peak separation observed experimentally in typical weak-beam images significantly overestimates the actual superpartial dislocation separation. The image simulations further infer that a recently reported four-peak weak-beam image is inconsistent with a fourfold dissociation of a single superdislocation.