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.
@article{arxiv.1106.4944,
title = {Polytypes of long-period stacking structures synchronized with chemical order in a dilute Mg-Zn-Y alloy},
author = {E. Abe and A. Ono and T. Itoi and M. Yamasaki and Y. Kawamura},
journal= {arXiv preprint arXiv:1106.4944},
year = {2011}
}
Comments
8 pages, 4 figures; submitted to Philosophical Magazine Letters