Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8042022 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2014 | 7 Pages |
Abstract
The effect of low temperature proton irradiation in depleted uranium dioxide was examined as a function of fluence. With 2.6Â MeV protons, the fluence limit for preserving a good surface quality was found to be relatively low, about 1.4 and 7.0Â ÃÂ 1017Â protons/cm2 for single and poly crystalline samples, respectively. Upon increasing the fluence above this threshold, severe surface flaking and disintegration of samples was observed. Based on scanning electron microscopy (SEM) and X-ray diffraction (XRD) observations the causes of surface failure were associated to high H atomic percent at the peak damage region due to low solubility of H in UO2. The resulting lattice stress is believed to exceed the fracture stress of the crystal at the observed fluencies. The oxygen point defects from the displacement damage may hinder the H diffusion and further increase the lattice stress, especially at the peak damage region.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Surfaces, Coatings and Films
Authors
J. Pakarinen, L. He, M. Gupta, J. Gan, A. Nelson, A. El-Azab, T.R. Allen,