Stability of nanosized oxides in ferrite under extremely high dose self ion irradiations
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2017 A nanostructured ferritic alloy (NFA), 14YWT, was produced in the form of thin walled tubing. The stability of the nano-oxides (NOs) was determined under 3.5MeV Fe+2 irradiations up to a dose of 585dpa at 450C. Transmission electron microscopy (TEM) and atom probe tomography (APT) show that severe ion irradiation results in a 25% reduction in size between the unirradiated and irradiated case at 270dpa while no further reduction within the experimental error was seen at higher doses. Conversely, number density increased by 30% after irradiation. This inverse coarsening can be rationalized by the competition between radiation driven ballistic dissolution and diffusional NO reformation. No significant changes in the composition of the matrix or NOs were observed after irradiation. Modeling the experimental results also indicated a dissolution of the particles.
Journal of Nuclear Materials
author list (cited authors)
Aydogan, E., Almirall, N., Odette, G. R., Maloy, S. A., Anderoglu, O., Shao, L., ... Hoelzer, D. T.
complete list of authors
Aydogan, E||Almirall, N||Odette, GR||Maloy, SA||Anderoglu, O||Shao, L||Gigax, JG||Price, L||Chen, D||Chen, T||Garner, FA||Wu, Y||Wells, P||Lewandowski, JJ||Hoelzer, DT