Papers by Author: Isao Murase

Abstract: Anomalous small and wide angle scattering measurements on electron-beam welded joint has been carried out at Zr absorption edge. We preformed an anomalous and simultaneous small- and wide-angle scattering (A-SWAXS) analysis on the welded joint with and without crystallization. For the wide angle measurements, we extend the SAXS measurements up to 13 nm-1, where q is still below the first halo, but is large enough for several Bragg peaks to be observed. In the present analysis, the ASAXS analysis at the HAS/beads interface is interpreted in conjunction with the corresponding AWAXS analysis. The origin of SAXS and WAXS was found to be different.

Abstract: Small-angle scattering measurements utilizing anomalous dispersion effect just below the Zr and Ni K edge have been made for welded Zr-based amorphous materials. The measurements were carried out at a bending magnet beam-line 40B of SPring8. A small and parallel X-ray beam generated at the third generation synchrotron is suitable for nanostructure mapping of heterogeneous materials, whose structure varies with less than a millimeter scale. The remelted and heat-affected zones were examined for electron-beam welded Zr-Ni-Cu-Al alloys. Merits and the characteristics, as well as its present limitations of scanning small-angle scattering with a use of anomalous dispersion effect is discussed as a tool to examine microstructure in the spatially inhomogeneous materials in macroscopic scale as well as microscopic scale.