Compositional transition layer around growing LPSO in Mg97Zn1Y2cast alloys

Takanori Kiguchi, Shuhei Matsunaga, Kazuhisa Sato, Toyohiko J. Konno

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3 Citations (Scopus)


Using conventional transmission electron microscopy (TEM) and aberration-corrected high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM), compositional irregularity has been identified around long-period stacking order structures (LPSOs) in aged Mg97Zn1Y2alloys, which have coexistence of LPSO and α-Mg matrix. Elemental mappings show that compositional transition layers surround the growing LPSOs. The compositional transition layer includes solute atmosphere in the α-Mg matrix and transition layers of LPSOs with lower concentrations of solute elements. The Zn concentration in a transition layer of LPSO is higher than that of Y, which differs from the α-Mg matrix and LPSOs. The transition layer is an 18R-type stacking sequence. No transition layer was observed after the transformation from 18R-type to 14H-type LPSOs. These results indicate that the segregation of Zn is faster than that of Y, and that the transition layer is a non-stoichiometric 18R-type LPSO with Zn-rich lower concentration of the solute elements, which connects an 18R-type LPSO and an α-Mg matrix.

Original languageEnglish
Pages (from-to)1377-1382
Number of pages6
JournalMaterials Transactions
Issue number9
Publication statusPublished - 2014


  • Aging
  • High angle annular dark field-scanning transmission electron microscopy (HAADF-STEM)
  • Long-period stacking order structure (LPSO)
  • Magnesium alloy
  • Transition layer


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