Abstract
Oxide Dispersion Strengthened (ODS) steels are considered as promising materials for structural components of advanced fusion and fission reactors. Its performance is largely determined by particle size and stability of the dispersed oxide nano-particles which forms during high temperature extrusion after dissolution of yttria in Fe during mechanical alloying. As the reactor structural materials are exposed to high neutron flux, study of irradiation stability of these particles is very important. In order to study irradiation stability of oxide particles in ODS alloy, two different ODS alloys of composition Fe-0.2Ti-0.3Y2O3, Fe–14Cr-0.2Ti-0.3Y2O3 were irradiated using 5 MeV Ni2+ ion beam to 150 dpa at 700 °C and 600 °C at JANNUS irradiation facility giving a dose of 40 dpa at the surface. In order to study the evolution of the nano oxide particles, the irradiated samples were examined using transmission electron microscopy (TEM). A drastic reduction in particle size along with an increase in particle density was observed in the Fe–14Cr-0.2Ti-0.3Y2O3 alloy irradiated up to 40 dpa at 700 °C as compared to 600 °C. The average size reduced from 4 nm (in as-prepared alloy) to 1 nm size. In Fe-0.2Ti-0.3Y2O3 alloy too, particle size reduction was observed upon irradiation at 700 °C, 40 dpa. The observations indicate that the nucleation of oxide particles in Fe matrix occurs along with inverse Oswald ripening.
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