Reactions between super-dislocations involved in deformation in the basal, prismatic, and type-I and II pyramidal planes in single-crystal Ti3Al were considered. The types of dislocation interactions were established that resulted in the formation dislocation barriers (microcrack nuclei). The required force and energy for microcracks to arise were found. The interaction between a and 2c + a super-dislocations resulted in microcracks with the plane of opening lying in basal and pyramidal planes; the interaction of 2c + a super-dislocations in different pyramidal planes resulted in the formation of microcracks in prismatic and pyramidal planes; and the interaction of a super-dislocations in basal and/or pyramidal planes did not cause the formation of dislocation barriers. The types of microcracks were classified in terms of the orientation of deformation axes of single crystals, and the regions of the stereographic triangle were determined characterized by a preferential type of crack opening.

Nucleation of Microcracks During Dislocation Interactions in a Ti3Al Single Crystal. L.E.Karkina, L.I.Yakovenkova: Physics of the Solid State, 2008, 50[6], 1061-70