b'Optimization of FeCrAl chemistries will enable use of FeCrAl as an accident tolerant fuel cladding material to improve both reactor safety and cycle efficiencies.spectroscopy utilizing a scanningalso be considered when optimizing tunnelling electron microscope (Seealloy chemistry. The current oxida-Figure 1). High Cr content alloys didtion results up to 1500h show that a not form a continuous Cr/Fe mixedCr content greater than 13 wt. % is oxide layer until 1000h or 1500h oflikely required for improved corrosion exposure, representing enhancedresistance with minimal impact on corrosion resistance with increasingmechanical properties. This project Cr content. Additions of yttriumwill continue oxidation testing past were shown to improve corrosion1 year of total exposure for a realistic resistance in comparable alloy studiesunderstanding of corrosion kinetics.(See Figure 2). Fe oxide nodules were not as prevalent on outer surfaces of high Cr content alloys, likely indicating that the nodule formation is reliant on the formation of a stable Cr/Al mixed oxide scale underneath. Uniaxial tension testing showed that low Cr FeCrAl alloys had similar yield strengths as high Cr FeCrAl alloys up to 800C. Yet, all FeCrAl variants that contained yttrium additions exhibited premature failure before reaching the ultimate tensile strength and ultimate elongation. While yttrium additions have been shown to enhance corrosion resistance, mechanical performance needs to 2023|AFC ACCOMPLISHMENTS 53'