Abstract:
The paper presents the results of a study of irradiation of high-energy electrons by an array
of FeNi nanostructures with doses from 50 to 500 kGy. Polycrystalline nanotubes based on FeNi,
the phase composition of which is a mixture of two face-centered phases, FeNi3 and FeNi, were chosen
as initial samples. During the study, the dependences of the phase transformations, as well as
changes in the structural parameters as a result of electronic annealing of defects, were established.
Using the method of X-ray diffraction, three stages of phase transformations were established: FeNi3
FeNi→FeNi3 FeNi→FeNi. After increasing the radiation dose above 400 kGy, no further phase
changes were followed, indicating the saturation of defect annealing and completion of the lattice
formation process. It was found that an increase in the degree of crystallinity and density of the
microstructures as a result of irradiation indicates electronic annealing of defects and a change
in the phase composition. It was established that the initial microtubes, in which two phases are
present, leads to the appearance of differently oriented crystallites of different sizes in the structure,
which contributes to a large number of grain boundaries and also a decrease in density, and are
subject to the greatest degradation of structural properties. For modified samples, the degradation
rate decreases by 5 times. In the course of the study, the prospects of the use of electron irradiation
with doses above 250 kGy for directed modification of FeNi microtubes and changes in structural
features were established.
