b'Radiation Resistant High Entropy Alloys for Fast Reactor Cladding ApplicationsPrincipal Investigator: Adrien Couet (University of Wisconsin-Madison)Team Members/ Collaborators: Calvin Parkin, Michael Moorehead, Mohamed Elbakhshwan, Dan Thoma, Kumar Sridharan (University of Wisconsin-Madison), Lingfeng He, Mukesh Bachhav (Idaho National Laboratory), Meimei Li, Weiying Chen (Argonne National Laboratory), David Armstrong (Oxford University, UK), Alan Savan, and Alfred Ludwig (Ruhr University of Bochum, Germany)Figure 1. MaDCoR LaboratoryT he advent of high entropy alloysments and advanced microscopygroup photo including members(HEAs) presents new opportuni- were conducted with selected prom-of the HEA team ties and challenges for alloyising compositions.design. The project evaluated the phaseProject Description:stability, mechanical properties, radia- The purpose of this research was to tion effects, and corrosion behaviorholistically evaluate the design benefit of various HEAs. To effectively probeof multiple principal elements in solid-the expansive compositional spaces ofsolution to nuclear structural materials. HEA families, laser metal deposition 3DPrevious modeling and experiments printed arrays of samples and combi- suggest the compositional complexity natorial magnetron-sputtered thinof such a base matrix may postpone the films were combined with CALPHADonset of rapid swelling, so the project phase predictions and high-throughputset out to experimentally determine experimental techniques to generatethe mechanisms that influence void large data sets conducive to machineswelling in such alloys. The project learning applications. More targetedfocused on the effect of a composition-mechanical and irradiation experi- ally complex base matrix, without the 104 2021|AFC ACCOMPLISHMENTS'