Abstract:
The paper presents the results of changes in the structural characteristics, and the degree of
texturing of FeNi nanostructures close in composition to permalloy compounds as a result of directed
modification by gamma radiation with an energy of 1.35 MeV and doses from 100 to 500 kGy. The
choices of energy and radiation doses were due to the need to modify the structural properties, which
consisted of annealing the point defects that occurred during the synthesis along the entire length
of the nanotubes. The initial FeNi nanostructures were polycrystalline nanotubes of anisotropic
crystallite orientation, obtained by electrochemical deposition. The study found that exposure to
gamma rays led to fewer defects in the structure, and reorientation of crystallites, and at doses
above 300 kGy, the presence of one selected texture direction (111) in the structure. During tests of
the corrosion resistance of synthesized and modified nanostructures in a PBS solution at various
temperatures, it was found that exposure to gamma rays led to a significant decrease in the rate of
degradation of nanotubes and an increase in the potential life of up to 20 days. It was established
that at the first stage of testing, the degradation of nanostructures is accompanied by the formation
of oxide inclusions, which subsequently lead to the formation of pitting corrosion and subsequent
partial or complete destruction of the nanostructures. It is shown that gamma radiation is promising
not only for targeted modification of nanostructures and increasing resistance to degradation, but
also for increasing the rate of catalytic reactions of the PNA-PPD type.
