b'of a Nuclear Science User FacilityBoris Maiorov at Los Alamos NationalFigure 4. Super-X EDS chemical (NSUF) Rapid Turnaround Experi- Laboratory for resonant ultrasoundmaps and depth profile line scanment (RTE) #20-4095, which wasspectroscopy measurements of shearof Cr 15 Fe 35 Mn 15 Ni 35irradiated to100 dpa at 500 C using 5.0 MeVawarded March 2020. These effortsmodulus and Poissons ratio. A newNi heavy ionswere supervised by Dr. Lingfeng Hesample of Cr18Fe27Mn27Ni28 at Idaho National Laboratory. Clearwas prepared to obtain faulted loop Ni enrichment near the surface ofstatistics needed for a publication.voids is observed in all cases. Mn Calvin Parkin was awarded RTE shows signs of diffusing away from#21-4233 to investigate void voids, with a more diffuse interface,nucleation and growth in HEAs while Fe and Cr are simply depletedunder Kr ion irradiation and He+ due to enriched Ni. Away from voids,co-implantation at the IVEM-Tandem Mn and Ni show depth-dependentfacility at Argonne National Labora-enrichment and depletion (see Figuretory. The work will be supervised by 4), which will provide informationDr. Meimei Li and Dr. Weiying Chen. about vacancy diffusion. Since previous IVEM experimentsThe team has also begun stepsdid not result in void formation (see toward experimental measurementCouet_2), this new RTE will provide of stacking fault energy by measure- valuable insight on the effect of ment of partial dislocation spacingcompositional complexity on He-by creating a focused ion beamdiffusion and the void nucleation in a lamella from a Cr18Fe27Mn27Ni28stabilizing environment.specimen previously fractured in ten-sion and sending off material to Dr. 2021|AFC ACCOMPLISHMENTS 107'