NANOCRYSTALLINE ALLOYS OF FE-CU-NB-SI-B AFTER NEUTRON-IRRADIATION

Transmission Mossbauer spectroscopy was used to study changes induced by irradiation of amorphous and nanocrystalline samples. In an as-cast sample neutrons mostly affect the orientation of a net magnetic momen t. The average hyperfine field decreases towards higher neutron fluenc ies. In the case of the nanocrystalline samples a new disordered struc ture is created in the amorpous remainder corresponding to boride phas es as it is shown in the samples isothermally heated from 1 to 8 hours . The structural changes of the amorphous remainder depend on the stag e of crystallization and total neutron fluencies.