Dislocation structures in γ-phase grains of 45Al-10at%Nb alloy specimens were characterized after tensile testing at room temperature. In addition to ordinary dislocations with b = ½<110], a certain density of super-dislocations and faulted dipoles was observed, which were rarely present in conventional 2-phase TiAl-based alloys of normal purity. This difference was attributed to the solution of high Nb contents in the γ phase, which may have increased the critical resolved shear stress for ordinary <110] slip.

Dislocation Structure in a Ti-45at%Al-10at%Nb Alloy Deformed at Room Temperature. W.J.Zhang, Z.C.Liu, G.L.Chen, Y.W.Kim: Philosophical Magazine A, 1999, 79[5], 1073-8