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首页> 外文期刊>Philosophical Magazine Letters >Structure of a crystalline approximant related to Al-Co-Ni decagonal quasicrystals studied by spherical aberration (Cs)-corrected scanning transmission electron microscopy and atomic-resolution energy dispersive X-ray spectroscopy
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Structure of a crystalline approximant related to Al-Co-Ni decagonal quasicrystals studied by spherical aberration (Cs)-corrected scanning transmission electron microscopy and atomic-resolution energy dispersive X-ray spectroscopy

机译：通过球差（Cs）校正的扫描透射电子显微镜和原子分辨率的能量色散X射线光谱研究了与Al-Co-Ni十边形准晶体有关的晶体近似物的结构

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Six types of decagonal quasicrystals (DQCs) found in Al-Co-Ni alloys with a wide compositional ratio of Co/Ni are considered to be stabilized by chemical ordering of Co and Ni, but the elucidation of this ordering has never been performed on alloys containing neighbouring elements Co and Ni. In order to examine the chemical ordering, an Al-Co-Ni crystalline phase, the PD_(3c) phase, which is an important approximant for understanding the structures of ordered Al-Co-Ni DQCs, in an Al_(71.5)Co_(16)Ni_(12.5) alloy has been studied by spherical aberration (Cs)-corrected scanning transmission electron microscopy (STEM) and atomic-resolution energy dispersive X-ray spectroscopy (EDXS). From the combination of observed high-angle annular dark-field and annular bright-field STEM observations, an atomic arrangement of the crystalline approximant can be directly derived. The chemical ordering of Co and Ni in the arrangement of transition-metal (TM) atoms and mixed sites (MSs) of TM and Al atoms can be clearly detected on atomic-resolution EDXS maps obtained with the special technique. Co atoms are located at the TM atom positions arranged in pentagonal tiling with a bond length of 0.76 nm, whereas Ni is enriched in the MSs located in pentagonal tiles of Co atoms. It can be concluded that the change of an area ratio of Co-rich clusters to Ni-rich MSs produces various types of DQCs with different compositional Ni/Co ratios.
机译：在Co / Ni组成比较宽的Al-Co-Ni合金中发现的六种十方准晶体（DQCs）被认为可以通过Co和Ni的化学有序化来稳定，但从未对合金进行这种有序化的阐明含有相邻元素Co和Ni。为了检查化学有序性，Al_（71.5）Co_（）中的Al-Co-Ni结晶相PD_（3c）相是理解有序Al-Co-Ni DQCs结构的重要近似值。已通过球差（Cs）校正的扫描透射电子显微镜（STEM）和原子分辨率能量色散X射线光谱（EDXS）研究了16）Ni_（12.5）合金。从观察到的高角度环形暗场和环形亮场STEM观测值的组合，可以直接得出晶体近似物的原子排列。可以在通过特殊技术获得的原子分辨率EDXS图上清楚地检测到Co和Ni在过渡金属（TM）原子以及TM和Al原子的混合位点（MS）排列中的化学排序。 Co原子位于以0.76 nm的键长排列在五边形平铺中的TM原子位置，而Ni富集在位于Co原子五边形瓦片中的MS中。可以得出结论，富钴团簇与富镍MS的面积比的变化产生了各种类型的DQC，它们具有不同的Ni / Co组成比。

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