Kinetics of changes in the saturation magnetization during annealings of the Fe-36% Ni invar alloy subjected to severe plastic deformation

Changes in the saturation magnetization and microhardness of the Fe-36% Ni invar alloy with a nanocrystalline structure, which were caused by annealings at different temperatures, are studied. The nanocrystalline structure was produced by severe plastic deformation. A high-temperature ferromagnetic phase was found to result from the formation of such a structure. The temperature of annealing after which the content of the phase is maximum was determined. When analyzing the kinetics of phase-composition changes, an increase in the diffusive mobility of atoms during the formation of the nanocrystalline state in the material was taken into account.