S. E. Danilov

THE EFFECT OF POINT DEFECT SINKS OF VARIOUS TYPES ON THE RADIATION-INDUCED DECOMPOSITION OF THE SOLID SOLUTION IN THE Fe-Ni INVAR

The residual resistivity technique is used to study radiation-induced decomposition in Fe–34.7at.%Ni alloys irradiated with 5 MeV electrons, with different types of sinks for point defects in the form of dislocations and deformation-induced vacancy clusters. It has been found that irradiation at about 300 K results in the formation of vacancy clusters. The dissociation of these clusters during isochronous annealing at temperatures between 350 and 550 K causes freely migrating vacancies and radiation-accelerated ordering in Fe–Ni alloys. As this takes place, two substages of vacancy cluster dissociation are observed, with dissociation energies of 1.2 and 1.5 eV. At temperatures of about 800 K, homogenization of the solid solution occurs. It is shown that the efficiency of dislocation sinks exceeds that of deformation-induced vacancy clusters.

Acknowledgment: The research was carried out under the state assignment from the Ministry of Science and Higher Education of the Russian Federation (theme “Function”, No 122021000035-6).

References:

1. Dimitrov, C. and Dimitrov, O. Composition dependence of defect properties in electron-irradiated Fe–Cr–Ni solid solutions. Journal of Physics F: Metal Physics, 1984, 14, 793–811. DOI: 10.1088/0305-4608/14/4/005.
2. Huguenin, D., Moser, P., and Vanoni, F. Vacancy clustering in electron-irradiated FeNiCr austenitic alloys. Journal of Nuclear Materials, 1989, 169, 73–78. DOI: 10.1016/0022-3115(89)90522-9.
3. Chamberod, A., Laugier, J., and Penisson, J.M. Electron irradiation effects on iron-nickel invar alloys. Journal of Magnetism and Magnetic Materials, 1979, 10 (2–3), 139–144. DOI: 10.1016/0304-8853(79)90165-3.
4. Arbuzov, V.L., Druzhkov, A.P., and Danilov, S.E. Effects of phosphorus on defects accumulation and annealing in electron-irradiated Fe–Ni austenitic alloys. Journal of Nuclear Materials, 2001, 295, 273–280. DOI: 10.1016/S0022-3115(01)00505-0.
5. Arbuzov, V.L., Danilov, S.E., Druzhkov, A.P., and Pavlov, V.A. Accumulation and annealing of radiation defects in Fe–Ni and Fe–Ni–P electron-irradiated alloys. The Physics of Metals and Metallography, 2000, 89 (4), 373–377.
6. Arbuzov, V.L., Danilov, S.E., Druzhkov, A.P., and Perminov, D.A. The influence of plastic deformation and radiation defects on the structural and phase transformations of N36 and N36T2 austenitic alloys. The Physics of Metals and Metallography, 2004, 98 (5), 500–505.
7. Kubashevsky, O. Iron-Binary Phase Diagrams, 1982, Springer–Verlag, Verlag Stahleisen, 185 p.

Article reference