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2014 ANNUAL REPORT 125 Accomplishments Prior to 2014 both Ni-5Cr and Ni-18Cr samples were irradiated with both protons and Ni-ions at 500C in the University ofWisconsin UW Tandem Accelerator Ion Beam. In early 2014TEM sample prepara- tion and preliminary analysis of the 500C proton-irradiated materials was performed in the CAES Microscopy and Characterization Suite MACS using the Quanta 3D Focused Ion Beam FIB andTecnaiTF-30TEM.AdditionalTEM characterization was also performed at the University ofWisconsin Materials Science Center MSC on theTecnai TF-30TEM and the FEITITANTEM. TheseTEM observations characterized and compared the density and size distributions of voids and dislocation loops in the samples Figures 1 and 2. Abnormal RIS behavior was also observed at 500C and was thought to be due to grain boundary migration effects Figure 3.This prompted the 400C proton irradiation in which the Ni-33Cr model alloy was also included. In addition to providing another composition with which to compare the formation of these microstruc- tural features Ni-33Cr was added to investigate whether or not irradiation could induce a low-temperature stable ordered phase which is present in this material at that composition. The second proton irradiation was also performed at the UWTandem Accelerator Ion Beam and the sample preparation and preliminary analysis were again performed at CAES-MACS. Figure 2. Void density and size distribution in 500C proton-irradiated Ni-Cr.