Realization of two-dimensional anomalous small-angle scattering of Al alloys at the K absorption edge of Al

Abstract

Two‐dimensional anomalous small‐angle X‐ray scattering (ASAXS) measurements at the K absorption edge of Al have been successfully performed. Contrast change below the absorption edge was detected with the use of a CCD detector. The change of ASAXS intensities near the edge for alumina nanopowder and that for Guinier–Preston zones in an Al–Zn alloy were explained by the anomalous dispersion of Al. The present results showed that two‐dimensional SAXS measurements with a dynamic range extended to show Porod's law have been achieved for photon energies of about 1.5 keV with the use of a CCD detector optically coupled with a P43 phosphor plate.

Two dimensional anomalous small-angle scattering measurements at the Mg K absorption edge for nanostructure analysis in concentrated Al-Mg alloys

“…Two-dimensional SAXS intensity was measured by P45 phosphor coupled with tapered optics (FOT) and a CCD detector cooled down to 233 K. Detail of the measurement system is given in 26) , where the measurements have been made at the K absorption edge of Al for the samples that have strong scattering contrast with isotropic profile. Calibration of scattering angle was made by the Debye rings of silver behenate 26,27) , where isotropic rings with uniform intensity along the rings were observed, showing that distortion correction is not necessary. Although several metastable phases are reported for Al-Mg binary alloys 28,29) , only one isolated dissolution peak was observed, which was attributed to GP zones.…”

“…26 where the measurements have been made at the K absorption edge of Al for the samples that have strong scattering contrast with isotropic profile. Calibration of scattering angle was made by the Debye rings of silver behenate, 26,27) where isotropic rings with uniform intensity along the rings were observed, showing that distortion correction is not necessary.…”