b'Nuclear Science User Facilities Study of Nb Redistribution in ZrNb Alloys Following ProtonIrradiation by Transmission Electron Microscopy with Energy Dispersive X-ray SpectrometryZefeng YuUniversity of Wisconsin, Madisonzyu226@wisc.eduT in the matrix and quantify alloying-his rapid-turnaround experiment (RTE) proposed to study theelement concentrations. From analyzing effect of irradiation on Nbthe compositions of precipitates in the redistribution in ZrNb alloys, providingmatrix, this study revealed the effect of knowledge on Nb redistributionirradiation on distribution of Nb atoms.and to quantify Nb concentrationResultsin both precipitates and matrix afterThe samples used in this study were irradiation. The overall research programZr-xNb (x = 0.2, 0.4, 0.5 and 1.0 aimed at precisely characterizing thewt.%) binary model alloys, each microstructure and microchemistryirradiated up to 1 dpa at 350C at the of proton-irradiated ZrNb alloys withUniversity of Wisconsin, Madisons different Nb contents below and aboveIon Beam Laboratory. The microstruc-the theoretical solid solubility limit toture and microchemistry characteriza-better understand in-reactor corrosiontion primarily focus on native precipi-behavior of ZrNb alloys [1]. Proton- tates and irradiation-induced platelets irradiated samples prepared by focused(IIPs) [1]. The blue arrows in Figure 1 ion beam (FIB) lift out technique wereshow native precipitates in the Zr studied utilizing the Titan Themis 200matrix of the ZrNb alloy in the irradi-transmission electron microscope (withated samples. Before irradiation, the transmission electron microscopy [TEM]precipitates usually contain less than and scanning transmission electron80 at.% Nb. After irradiation, native microscopy [STEM]) with super-Xprecipitates contain about 4060 energy dispersive spectroscopy (EDS) atat.% Nb. IIPs were only found in the Irradiated Materials CharacterizationZr-0.5Nb and Zr-1.0Nb alloys. These Laboratory (IMCL). The state-of-the-artIIPs (highlighted with red arrows in Titan provides high resolution to revealthe figure) were about 100 nm long nanostructures, and super EDS canand about 20 nm wide. Because of the effectively map Nb-rich precipitatesmatrix effect, EDS sometimes shows 58'