The symmetrical superlattice intrinsic stacking faults formed on {111} planes were the predominant crystal defects in polycrystalline Ni3Al after slight deformation at room temperature. The formation of this kind of superlattice intrinsic stacking faults resulted from the dipoles which were distributed on the neighboring n{111} planes after reorientation, dissociation and annihilation under applied stress.

Symmetrical SISF in Deformed Ni3Al and its Formation Mechanism. Yan, W.: Acta Metallurgica Sinica A, 1992, 5[2], 76-81