Local Structural Analysis around Solute-Element in Annealed Mg(99.2)Zn(0.2)Y(0. 6 )Alloy using X-ray Fluorescence Holography
MATERIALS TRANSACTIONS(2023)
Abstract
X-ray fluorescence holography was applied to dilute Mg99.2Zn0.2Y0.6 alloy annealed at 520 celcius for 5 h to obtain atomic images around Zn atom. In spite of the extremely low concentration of the solute-element, clear hologram patterns were obtained. The reconstructed atomic images revealed that the Zn atom in this annealed Mg99.2Zn0.2Y0.6 alloy mainly occupy the hcp Mg site. This finding is consistent with the transmission electron microscope image, where fcc-type stacking faults are hardly observed. These results are in contrast to the previous report that Zn and Y form short-range-ordered solute clusters at the fcc-type stacking fault in Mg-Zn-Y alloy. The effect of heat treatment on the atomic arrangement of solute-elements in this dilute alloy is discussed in relation to the previously reported mechanical properties.
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Key words
X-ray fluorescence holography,Mg alloy,mille-feuille structure,synchrotron radiation
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