This paper presents the results of the study of the effect of irradiation temperature on structural and optical distortions and deformations, as well as the strength properties of BeO ceramics as a result of irradiation with Ar 8+ and Xe 22+ ions at a radiation dose of 5х10 13 cm -2 . The choice of radiation dose is due to the effect of overlapping defective areas arising along the trajectories of ions in ceramics, which makes it possible to model radiation damage caused by the effect of accumulation as a result of cascade collisions and overlapping damaged areas. The temperature range of 300-1000 K was chosen to simulate different operating conditions, as well as the possibility of simulating partial annealing of defects during irradiation at high temperatures. During the research it was established that hightemperature radiation reduces in uence of size of electronic and nuclear power losses of ions of Ar 8+ and Xe 22+ with energy of 70 MeV and 231 MeV, respectively, on extent of radiation damage of ceramics of BeO. Irradiation at a temperature of 1000 K results in an equal 14% change in dislocation density for these particles, a comparable decrease in the yield intensity of optically stimulated luminescence by 5% and 15%, as well as microhardness by 25% and 30%, respectively.
The aim of this work is to study the effect of irradiation with low-energy Kr 14+ ions with an energy of 280 keV on radiation swelling and a decrease in the strength characteristics of highentropy alloys based on the Ti-Ta-Nb-V system. The prospects of these studies are due to the possibility of obtaining new data on the radiation resistance of high-entropy alloys, which have great potential for use as structural materials for new generation reactors. The choice of this type of irradiation and a dose of 5х10 15 Kr/cm 2 made it possible to simulate the effect of radiation swelling arising at a displacement per atom of 30-50 dpa in a small surface layer no more than 100-150 nm thick. During the studies carried out, it was found that the formed medium-and high-entropy alloys TaNbV and TiTaNbV have increased resistance to swelling and deformation of the crystal structure. At the same time, alloys of the NbV and TaNbV type have the highest degree of resistance to softening, while the TiTaNbV alloy has a lower resistance to swelling, since the addition of titanium leads to a decrease in the density and hardness of the alloy.
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