Superdislocation Core Structure in Type I and Type II Pyramidal Planes of Ti_3Al Intermetallic: Glissile Dislocations and Dislocation Barriers

摘要

The energies of surface defects in the basal and prismatic planes, as well as in the planes of type 1 and type II pyramids. are calculated by using N-particle interaction potentials for the Ti_3Al intermetallic with the D0_(19) superlattice. The core structure of 2c + a edge and screw glissile and sessile (barrier-forming) dislocations in pyramidal planes of type I, {202-bar1}, and type II, {1-bar1-bar21}, in Ti_3Al is analyzed.