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Information × Registration Number 0225U004960, (0124U002437) , R & D reports Title Modeling secondary phases precipitation and solutes segregation in zirconium-based Zr-Nb-Sn-(Fe, Cr) alloys at neutron irradiation popup.stage_title Моделювання випадіння вторинних фаз та сегрегації домішок у цирконієвих сплавах Zr-Nb-Sn-(Fe, Cr) при нейтронному опроміненні Head Dmytro O. Kharchenko, д.ф.-м.н. Registration Date 23-12-2025 Organization Institute of Applied Physics National Academy of Sciences of Ukraine popup.description1 Establish properties of radiation-induced processes of precipitation/amorphization/dissolution of secondary phase precipitates (SPP), developing defect structure, and analysis of changes in mechanical properties in Zr-Nb-Sn-(Fe, Cr) alloys under neutron irradiation. popup.description2 This work investigates radiation-induced precipitation, amorphization, and dissolution of secondary-phase inclusions, as well as the evolution of defect structures in Zr–Nb–Sn–(Fe,Cr) alloys under neutron irradiation. Phase-field and reaction-rate theory approaches were developed to analyze the role of Fe and Cr in secondary-phase stability, impurity segregation, and irradiation-driven microstructural transformations. It is shown that ballistic mixing destroys precipitates at low irradiation temperatures, while at elevated temperatures neutron irradiation can sustain phase separation. Iron in the secondary phase of unirradiated alloys gradually dissolves into the zirconium matrix, whereas chromium remains stable within secondary-phase inclusions even under prolonged irradiation. Interstitial loops grow continuously up to ~20 nm at doses up to 30 dpa, while vacancy ⟨a⟩-type loops are metastable and limited to ~10 nm. ⟨c⟩-type loops nucleate above a critical dose and grow up to ~50 nm. Local loop inhomogeneities cause lattice deformation, and irradiation-induced strengthening increases with temperature and decreases with grain size. The mechanical response under shear, tension, and compression was analyzed. Neutron irradiation and higher strain rates increase yield strength and ultimate strength, while additional Fe and Cr content (up to 1%) further enhances the mechanical properties of Zr–Nb–Sn–Fe–Cr alloys. Product Description popup.authors Kharchenko Vasyl Olegovych Schokotova Olha Mykhaylivna Dmytro V. Leikykh Serhiy V. Kokhan Oleg B. Lysenko popup.nrat_date 2025-12-23 Close