Fracture behaviour of Ti3Al single crystals for the basal slip orientation

Electron microscopic study of Ti3Al microstructure after deformation at 1073–1273 K

“…The core of each of the partial dislocations had considerable displacements in the prism plane, which were distributed over 2-3 interplanar spacings. On the strength of these results, a model describing the formation of shear-type microcracks was proposed [16,17], including processes of the cross slip to the prism plane. At T > 1073 K the a superdislocation is rearranged alternatively in the basal plane and this rearrangement consists of the recombination of Shockley partial dislocations and the cross slip of the a/2 superpartial dislocation to the prism plane.…”

Dislocation core structure and deformation behavior of Ti3Al

“…Dislocations were split according to reactions ( 12) and ( 13) in the starting glissile configurations. Figure 10(a) displays the structure of the core of a superpartial dislocation with a Burgers vector 1/6[2 1 1 6] and an axis [1 2 1 0] split into two partial dislocations according to (12) at α = 0.5 and β = 0.5. After relaxation the core of this dislocation is planar because the basic region is localized near the ( 2 0 2 1) plane containing APBs.…”

“…Several starting configurations were employed when studying the core structure of the screw superpartial dislocations. The first configuration corresponds to a superpartial with a Burgers vector 1/6[2 1 1 6] split into two partials according to reaction (12) at α = 0.5 and β = 0.5 in the pyramidal plane ( 2 0 2 1). The second configuration corresponds to the one split into two partials according to reaction (13) in the pyramidal plane (1 1 2 1).…”