b'Project Description: Figure 1.The thickest coating wasFigure 2. (a) Scanning transmission The overall objectives of this researchproduced by cold spray technologyelectron microscopy (STEM) high are to measure the interface strength(40-50 microns) while the thinnestangle annular dark field (HAADF) image of HiPIMS coated Zr4 plate of Chrome coatings on Zircaloywas produced using physical vaporsample after 50 dpa irradiation with and understand the microstructuraldeposition (2 microns). Ion irradia- stopping and range of ions in matter features that lead to this interfacetion was performed on the coatings(SRIM) dpa (red solid line) and Cr strength.In addition, ion irradiationin crossection to 50 dpa at 300Cion (yellow dashed line) profiles superimposed. (b) Transmission is being used to understand how irra- using Cr ions showing the leastElectron Microscopy (TEM) bright diation affects the interface strength. amount of damage in the HiPIMSfield (BF) and (c) TEM DF images coating which has a very fine-grainedof the HiPIMS Cr coating after Accomplishments: microstructure (Figure 2). The fineirradiationChrome coatings were producedgrains provide sinks for defects by cold spray at the University ofproduced under irradiation leading Wisconsin, by physical vapor deposi- to improved radiation tolerance. An tion at Los Alamos National Labora- annealing treatment was performed tory and by High Power Impulseon the cold spray coating at 1000C Magnetron Sputting (HiPIMS) atand it produced an intermetallic at Acree Technologies Inc. and suppliedthe interface.Upon irradiation of by ORNL.Crossectional imagesthis annealed coating, the interme-of these coatings are shown in 2021|AFC ACCOMPLISHMENTS 59'