Synchrotron radiation X-ray diffraction study on nucleation and growth of nanocrystalline phase in Fe-Si-B-P-Cu-C amorphous alloys

Fe-Si-B-P-Cu-C nanocrystalline alloys are soft magnetic materials with high saturation magnetic flux density and low loss. Since the magnetic properties change depending on the heat treatment conditions, there has been interested in the close correlation between the heat treatment meathod and the magnetic property. In order to obtain excellent magnetic properties, it is important to derive the optimal heat treatment condition for nanocrystallization during the nucleation and growth process of the α-Fe. In-situ observation of the nucleation and growth of the nanocrystalline phases using synchrotron radiation X-ray diffraction provides direct evidence that the grain growth rate and final state grain size vary with annealing temperature.