Izvestiya vuzov. Yadernaya Energetika

The peer-reviewed scientific and technology journal. ISSN: 0204-3327

Interaction of Substitutional and Interstitial Atoms with each other, and with Radiation Defects in Alloys V−Fе under Irradiation with Fast Neutrons

6/05/2024 2024 - #02 Nuclear materials

Zakharova М.I. Tarasikov V.P.

DOI: https://doi.org/10.26583/npe.2024.2.09

UDC: 621.039.531

The paper presents the results of studies of V−Fe alloys irradiated with fast neutrons and obtained using internal friction and electrical resistance. The studies were conducted in order to clarify the effect of radiation-stimulated phase transformations, decay of substitutional and interstitial solid solutions, and radiation-induced iron segregation on vacancy swelling during isochronous annealing. To study the processes occurring during isochronous annealing in the V−Fe system, an alloy V + 0.65 at.% Fe was selected. This choice is due to the fact that, comparing to other alloys, the maximum number of Fe atoms − 0.54 at.% − come out of the solid solution of this alloy during irradiation, which makes up 83% relative to the original composition.

A feature of the restoration of the electrical resistance of the alloy V + 0.65 at.% Fe is the presence of peaks of an abrupt change in the value of electrical resistance in the temperature range of 400−1000°C. In an alloy V+0.65 at.% of Fe irradiated with neutrons up to 1.4 dpa at a temperature of 400°C, during isochronous annealing in the temperature range of 100−300°C after 100°C for 1 hour at a residual pressure of no more than 7×10–4 Pa, a migration of Fe atoms is observed throughout the temperature range: during annealing up to 500°C, the decay of a significant part of radiation-induced segregation and reconstitution of solid substitution solution is observed; in the range of 500–600°C the number of Fe atoms in solid solution decreases by about 50%, i.e. Fe atoms again segregate on defects that are stable in this temperature range. Such changes persist up to 1000°C; in the temperature range from 1000−1300°C, the solid solution contains about 0.30 at.% Fe.

The change in the electrical resistance of the irradiated alloy caused by the migration of Fe atoms in the matrix V is determined.

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сплавы V−Fe нейтронное облучение радиационные дефекты фазовые превращения вакансии междоузельные атомы дислокации поры внутреннее трение электросопротивление

Link for citing the article: Zakharova М.I., Tarasikov V.P. Interaction of Substitutional and Interstitial Atoms with each other, and with Radiation Defects in Alloys V−Fе under Irradiation with Fast Neutrons. Izvestiya vuzov. Yadernaya Energetika. 2024, no. 2, pp. 104-111; DOI: https://doi.org/10.26583/npe.2024.2.09 (in Russian).

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