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Detection of Near-Surface sup 52 Cr Segregation in Irradiated Sup 51 V(Cr) by RBS (Rutherford Backscattering Spectrometry)

机译:RBs(卢瑟福背散射光谱法)检测辐照sup 51 V(Cr)中近表面sup 52 Cr偏析

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Irradiation at elevated temperatures of V(Cr) alloys is known to create a near-surface layer of nonequilibrium Cr enrichment. Highly reproducible RBS spectra were accumulated from a V-15%Cr alloy irradiated at 750 deg C, and from unirradiated portions of the same specimen. Differences between these spectra are used to demonstrate the high sensitivity of conventional RBS techniques for determining near-surface segregation behavior. Sensitivities obtained utilizing differences in the acquired spectra are much higher than those typically assumed for RBS measurements. Using 1.8 MeV sup 4 He, and conventional RBS equipment and scattering geometries, segregation of less than or equal to2 atomic layers of sup 52 Cr in sup 51 V-15 at. %Cr over a depth of approx.5 nm has been observed. (ERA citation 12:016257)

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