Transmission electron microscopy methods were used to analyze the deformation-induced antiphase boundary tubes in a Ni3Al single crystal. A high density of tubes was observed after room-temperature deformation showing strong contrasts in some fundamental reflections. This was not expected from a hard sphere model of the antiphase boundary faults bounding the tubes since in this case the antiphase boundary faults were just chemical faults (displacement vector, RC = ½<110>). The transmission electron microscopic analysis showed unambiguously that the antiphase boundary faults contained a small additional structural displacement vector, RS; which lay in the plane of the fault and was perpendicular to RC.

TEM Investigation of the Structure of Deformation-Induced Antiphase Boundary Faults in Ni3Al. Rentenberger, C., Waitz, T., Karnthaler, H.P.: Physical Review B, 2003, 67[9], 094109