Two dimensional anomalous small-angle scattering measurement at K absorption edge of Mg has been successfully demonstrated for concentrated Al-Mg binary alloys and MgO nanoparticles. Enhancement of contrast between Mg-rich precipitates and Al matrix was explained by anomalous dispersion of Mg, and anisotropic SAXS pattern agreed with the microstructure observed by TEM. Agreement of atomic scattering factor obtained from Al-Mg and MgO nanoparticles indicates that the origin of SAXS in the present Al-Mg alloys is Guinier-Preston zones, not the voids that grew from supersaturated vacancies.
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.
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