SURFACE PROPERTIES OF A NANOCRYSTALLINE Fe-Ni-Nb-B ALLOY AFTER NEUTRON IRRADIATION
Milan Pavúk – Jozef Sitek – Katarína Sedlačková
The effect of neutron radiation on the surface properties of the nanocrystalline (Fe0.25Ni0.75)81Nb7B12 alloy was studied. Firstly, amorphous (Fe0.25Ni0.75)81Nb_7B12 ribbon was brought by controlled annealing to the nanocrystalline state. After annealing, the samples of the nanocrystalline ribbon were irradiated in a nuclear reactor with neutron fluences of 1×1016 cm-2,/sup> and 1×1017 cm-2. By utilizing the magnetic force microscopy (MFM), topography and a magnetic domain structure were recorded at the surface of the ribbon-shaped samples before and after irradiation with neutrons. The results indicate that in terms of surface the nanocrystalline (Fe0.25Ni0.75)81Nb7B12 alloy is radiation-resistant up to a neutron fluence of 1×1017 cm-2. The changes in topography observed for both irradiated samples are discussed.
Keywords: nanocrystalline materials, neutron radiation effects, magnetic force microscopy, MFM, surface topography