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Nuclear Science User Facilities 124 Radiation Induced Segregation in Nickel-Chromium Alloys Janne Pakarinen University of WisconsinMadison jpakarinsckcen.be Nickel Ni-based alloys are employed in current light water reactors LWR though typically not as in-core components. They are also candidate materials for molten salt reactor applications due to their excellent corrosion resistance in fluoride salt systems.As such understanding how radiation damage influences their microstructures and performance in these systems is crucial to the development of safe and reliable molten salt reactor technologies. Project Description This project will investigate the micro- structural effects of ion irradiation in Ni-based alloys with a focus on the manifestation of voids dislocation loops and radiation-induced segrega- tion RIS.The formation of these features in binary Ni-Chromium Cr alloys is being studied as a function of three experimental variables Cr composition 5wt Cr 18wt Cr and 33wt Cr Irradiation temperature 400C and 500C Irradiating species proton vs. Ni-ion irradiation These variables are characterized using analytical transmission electron microscopy TEM techniques to show the expected radiation responses of these alloys in a nuclear reactor system as well as to provide experimental data to be used as benchmarks in the development of predictive models for the formation of these features. Figure 1. Dislocation loop density and size distribution in 500C proton- irradiated Ni-Cr. Understanding the radiation responses of Ni-based alloys is vital to developing reactor core components for next-generation molten salt technologies.