c slip in Ti3Al

Publisher Website
Google Scholar
Abstract
Strained Ti3Al polycrystals exhibit local evidence of slip in the c direction on a [20] prism plane. Dislocation mobility appears to be affected in the edge and several specific mixed orientations by their interaction with the lattice. Segmentation of the dislocation lines along the edge direction and, to a lesser extent, along the and mixed directions attests to pronounced first- and second-order Peierls valleys respectively. Contrary to what is usually observed in such processes, it is within about 30[ddot] from the screw orientation that dislocations appear to be the least affected by Peierls effects. Dislocation dissociation is not detectable under weak-beam conditions. It is pointed out that the favoured line orientations could originate from core spreading out of the prism slip plane possibly in the basal or second-order pyramidal planes for the edge orientation and in the first- and second-order pyramidal planes for the kinks.