Proton irradiation-induced blistering in UO2

Janne Pakarinen (Corresponding Author), Lingfeng He, Jian Gan, Andrew T. Nelson, Anter El-Azab, Marat Khafizov, Todd R. Allen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Proton (H+) irradiation effects in polycrystalline UO2 have been studied. The irradiation was carried out using three ion energies and two different ion fluxes at 600 °C. Scanning electron microscopy (SEM) investigations showed that significant surface flaking took place. Focused ion beam (FIB) milling in SEM was successfully applied for extracting lamellas from uneven blistered surfaces for transmission electron microscopy (TEM) investigations allowing detailed investigations for the degradation mechanisms. High-resolution TEM for the flaked UO2 surfaces revealed that the implanted H+ formed sharp two-dimensional cavities at the peak ion-stopping region instead of diffusing to the matrix. The resulting lateral stress likely caused UO2 surface deterioration in good agreement with previous blistering and flaking studies on crystalline materials. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Number of pages5
JournalMRS Advances
DOIs
Publication statusE-pub ahead of print - 9 Nov 2021
MoE publication typeA1 Journal article-refereed

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