Abstract
The effect of 15-keV Ar+ ions on the structure of austenitic chromium-nickel steel in the 3.1 × 1017–7.5 × 1017 cm–2 fluence range has been investigated in this work. X-ray diffraction analysis indicates a nonmonotonous change in the lattice parameter and the level of microstresses in some crystallographic directions with increasing fluence. The anisotropy appearance of these stresses gradually decreases and the texture becomes weaker. These processes are associated with radiation defects at the initial stage of irradiation and their radiation-induced annealing as the fluence increases. Transmission electron microscopy has revealed atomic separation in the solid solution and a decrease in the dislocation density in the steel starting from a fluence of 5 × 1017 cm–2 (40 dpa). Similar data have been obtained when steel of a similar composition has been exposed to high-energy ions. No pore formation has been detected under the used irradiation conditions, since the swelling threshold (according to known estimates, ~70 dpa) has not been reached.
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ACKNOWLEDGMENTS
The electron microscopic studies were performed at the Center of the Collaborative Test Center of Nanotechnologies and Advanced Materials, Institute of Metal Physics, Ural Branch, Russian Academy of Sciences.
Funding
This work was supported by the Russian Scientific Foundation (project no. 19-79-20173).
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Translated by T. Gapontseva
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Gushchina, N.V., Makhin’ko, F.F., Ovchinnikov, V.V. et al. Effect of Medium-Energy Ar+ Ion Irradiation on the Structure of Austenitic Chromium–Nickel Steel. Phys. Metals Metallogr. 122, 307–313 (2021). https://doi.org/10.1134/S0031918X21030078
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DOI: https://doi.org/10.1134/S0031918X21030078