The stored energy, which is the main driving energy of the primary recrystallization, was measured in two Fe-48%Ni cold-rolled samples using three different approaches: the neutron diffraction method based on the peak broadening, the Kernel Average misorientation (KAM) and the Dillamore methods both based on the misorientation and dislocation cell size estimation using EBSD (Electron Back Scatter Diffraction) data. The results were compared with each other and showed differences in stored energy values. In this paper, it is demonstrated that the stored energy calculated by both KAM and Dillamore approaches is underestimated compared to that one calculated from neutron diffraction peak broadening. This is because Dillamore approach considers only the GND (Geometrically Necessary Dislocations), blocked in the cell walls, the KAM method takes into account only the GND in all of the microstructure (cells and walls) and the neutron diffraction method takes into consideration all types of dislocations (SSD (Statistically Stored Dislocations) and GND) within the microstructure. The measurement principle and the energy gap observed between the different approaches were discussed.

Hyper textured substrate tapes were prepared by cold rolling and annealing of a Fe48%Ni alloys in order to obtain Cube oriented substrate for photovoltaic thin films and superconductor cables in particular. In the present work, the effect of sulfur on recrystallization and sharp Cube texture formation has been investigated. Results show that the formation of Cube texture is favored by the addition of sulfur in the Fe48%Ni alloy. In order to explain this result, the development of Cube texture during recrystallization has been investigated by EBSD, furthermore, the stored energy has been measured using neutron diffraction on the deformed states. It appeared that MnS precipitates are at the origin of hardening that increases the stored energy gap between the Cube component and the other ones. This difference favors the Cube development.