Polytypes of long-period stacking structures synchronized with chemical order in a dilute Mg-Zn-Y alloy

Details Polytypes of long-period stacking structures synchronized with chemical order in a dilute Mg-Zn-Y alloy Polytypes of long-period stacking structures synchronized with chemical order in a dilute Mg-Zn-Y alloy

2011-06-24

arxiv.org/abs/1106.4944v2

Physics

Condensed Matter

Materials Science

8 pages, 4 figures; submitted to Philosophical Magazine Letters

Scientific paper

10.1080/09500839.2011.609149

A series of structural polytypes formed in an Mg-1at.%Zn-2at.%Y alloy has been identified, which are reasonably viewed as long-period stacking derivatives of the hcp Mg structure with alternate AB stacking of the close-packed atomic layers. Atomic-resolution Z-contrast imaging clearly revealed that the structures are long-period chemical-ordered as well as stacking-ordered; unique chemical order along the stacking direction occurs as being synchronized with a local faulted stacking of AB'C'A, where B' and C' layers are commonly enriched by Zn/Y atoms.

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