Microstructure evolution during cold rolling of binary stoichiometric Ni3Al single crystals was examined using optical and transmission electron microscopy. In the case of the <001> initial rolling direction, the banded structure was formed. Inside each matrix band, the localized shear deformations occur alternately on two {111} planes. In addition, huge amounts of widely extended superlattice intrinsic stacking faults were observed from relatively early stage of cold rolling. The occurrence of the localized shear deformation was considered to be controlled by the superlattice intrinsic stacking faults since they had to be strong obstacles for the dislocation motion on the other glide plane. The extensive formation of the superlattice intrinsic stacking faults was therefore considered to be one of the most important microstructural features which control the cold rolling behavior of Ni3Al.

Microstructures in Cold-Rolled Ni3Al Single Crystals. Kishida, K., Demura, M., Hirano, T.: Materials Research Society Symposium Proceedings, 2005, 842, 85-90