Structure of Ni 3 Al Single Crystal after Severe Plastic Deformation

Synchrotron X-ray diffraction study of L1 2 ordered Ni 3 Al single crystals was performed. The ultrafine-grained structure resulting from severe plastic deformation was studied. In the initial state, the ordered single crystal is oriented along the [211] compression axis. Along with the ordered phase, there is a small fraction of disordered crystal oriented along the [100] axis. Compression of the samples and subsequent torsion at different angles led to disturbance of the single crystallinity of the sample and a change in the state of the atomic order up to the disappearance of the L1 2 superstructure.