Mechanical properties and deformation mechanisms of two compounds based upon Nb3Al; both containing 15at%Al and one with 10at%Ti and the other with 40at%Ti were determined. The compounds could be prepared as single-phase materials with a B2 crystal structure. In the heat-treated condition, a second phase could be precipitated with, for example, the A15 crystal structure in the case of the 10at%Ti alloy. The compounds were strong at least up to 900C, and were inherently ductile. The compounds deformed by activation of one or more of: <111>{110}, <111>{112} and <111>{123}. The dislocations were present in the form of dissociated super-partial pairs; each with a Burgers vector of ½<111>, which bounded a ribbon of antiphase boundary. From the separation of the partial dislocations, the antiphase boundary energies on the {110} planes were found to be approximately 150 and approximately 15mJ/m2 for the 10at%Ti and 40at%Ti alloys, respectively.

Deformation Mechanisms in Intermetallic Compounds Based on Nb3Al. J.Shyue, D.H.Hou, M.Aindow, H.Fraser: Materials Science and Engineering A, 1993, 170[1-2], 1-10