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
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DOI：
10.1080/09500839.2011.609149
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发表时间：
2011-01-01
影响因子：
1.2
通讯作者：
Kawamura, Y.
中科院分区：
文献类型：
--
作者：
Abe, E.;Ono, A.;Kawamura, Y.
Mg-1at.%合金中形成的一系列结构多型体Zn-2原子% Y合金，这是合理地被视为六方密排Mg结构的长周期堆积衍生物，具有交替的AB堆积的密排原子层。原子分辨率的Z衬度成像清楚地表明，该结构是长周期的化学有序以及堆叠有序;独特的化学顺序沿着堆叠方向发生同步与局部故障堆叠的AB 'C'A，其中B'和C'层通常由Zn/Y原子富集。
A series of structural polytypes formed in an Mg-1 at.% Zn-2 at.% Y alloy has been identified, which are reasonably viewed as long-period stacking derivatives of the hexagonal-close-packed 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.