Structure and properties of the surface layer of zirconium-niobium alloy subjected to high-dose implantation with 10B+ boron isotope ions

The creation of layers implanted with boron isotope 10B on the elements of the core of a nuclear reactor can, due to the anomalously large neutron capture cross-section, provide a decrease in the reactivity of the reactor at the beginning of the company for its operation. The aim of this work is to study the effect of high-dose implantation with 10B + boron isotope ions (ion energy 22 keV, exposure doses from 1×10¹⁶ to 7×10¹⁶ ion/cm²) on the structure and properties of the surface of E110 alloy samples. It was found that implantation with 10B+ boron ions with an energy of 22 keV at a dose of 7×10¹⁶ ions/cm² leads to an increase in the surface microhardness from 3 GPa for the initial one to 3.7 GPa for the implanted sample. It was found that the corrosion rate of E110 alloy samples in 1% HF solution after implantation (ion energy 10B + 22 keV, dose 7×10¹⁶ ion/cm²) is 1.2-1.4 times lower than for the initial alloy. It is shown that the implantation of the E110 alloy with 10B + boron ions is accompanied by the formation of a subgrain structure with dimensions 100-200 nm in the surface layer, an increase in the scalar dislocation density, and the release of nanosized 1.8-2.3 nm zirconium boride particles.

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