|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||Bulk Extraction and XAS Characterization of Oxides in Nanostructured Ferritic Alloy MA957
||Tiberiu Stan, David Sprouster, Avishai Ofran, Lynne Ecker, George Odette
|On-Site Speaker (Planned)
Nanostructured Ferritic Alloys (NFAs) are strengthened by Y-Ti-O nano-oxide features (NFs) that impede dislocation motion, enhance defect recombination and trap transmutation product He in small high-pressure gas bubbles. TEM and XRD studies show that the NFs predominantly include pyrochlore Y2Ti2O7 and orthorhombic Y2TiO5, although other phases exist, especially at larger sizes. Fluorescence-mode XAS measurements can obtain information on the local atomic environments in the NFs. However, XAS signals from the NFs can be confounded by other Y, and especially Ti, environments like in the matrix. Here we describe an extractive method to isolate a particular NF population of interest by non-acidic dissolution of only the metallic matrix followed by selective filtering of the isolated oxide remnants. The extracted oxides trapped in 10 nm pore filters are consistent with a disordered Y2TiO5 phase. Further studies will aim to observe the smallest NFs that are believed to be primarily Y2Ti2O7.
||Planned: A print-only volume