It was noted that, in spite of the large number of studies of the plastic properties of L12 crystals, the crystalline defects produced by high-temperature deformation of phases based upon Ni3Al(γ′) were not yet thoroughly understood at that time. Some examples of unusual three-dimensional defects were observed in deformed γ′ precipitates of the industrial nickel-based two-phase superalloy CMSX2 and in deformed specimens of the L12 alloy Ni-9Al-14Ti-3.5at%Cr. These defects, which involved superlattice stacking faults, stair-rod-dislocation-like defects and super-partial dislocations, were analysed using both conventional and high resolution electron microscopy, and the computed imaging technique coupled with two-beam diffraction theory.

On Three-Dimensional Defects in the Ni3Al(γ′) Phase Identified by the Computed Imaging Technique. Bonnet, R., Ati, A., David, D.: Journal of Alloys and Compounds, 1992, 188[C], 198-201