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In-Situ observation of local atomic structure of Al-Cu-Fe quasicrystal formation

机译：Al-Cu-Fe准晶体形成的局部原子结构的原位观察

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摘要

The phase and local environment, neighbouring atoms and coordination numbers (CN), for an Al-Cu-Fe multilayer were studied during heating (to 800 °C) and cooling (to room temperature) processes using in-situ X-Ray diffraction (XRD) and in-situ X-ray absorption spectroscopy (XAS) techniques to investigate the formation of Al-Cu-Fe quasicrystals (QCs). In-situ XRD clarified the transition of the ω-Al7Cu2Fe phase to a liquid state at the high temperature which transformed into the QC phase during cooling. The in-situ XAS showed a relatively small shift in distance between Cu-Al and Fe-Al during the phase evolution from RT to 700 °C. The distance between Cu-Cu, however, showed a significant increase from ω-phase at 700 °C to the liquid state at 800 °C, and this distance was maintained after QC formation. Furthermore, the CN of Fe-Al was changed to N = 9 during cooling. Through our observations of changes in CN, atomic distances and the atomic environment, we propose the local structural ordering of the quasicrystalline phase originated from a liquid state via ω-phase. In this study, we give a clear picture of the atomic environment from the crystalline to the quasicrystalline phase during the phase transitions, which provides a better understanding of the synthesis of functional QC nanomaterials.
机译：使用原位X射线衍射（Al-Cu-Fe）多层板在加热（至800 C）和冷却（至室温）过程中研究了相和局部环境，邻近原子和配位数（CN） XRD）和原位X射线吸收光谱（XAS）技术研究Al-Cu-Fe准晶体（QC）的形成。原位XRD证实了在高温下ω-Al7Cu2Fe相转变为液态，在冷却过程中转变为QC相。在从室温到700 C的相变过程中，原位XAS显示Cu-Al和Fe-Al之间的距离相对较小。然而，Cu-Cu之间的距离显示出从700℃的ω相到800℃的液态的显着增加，并且该距离在形成QC后得以保持。此外，在冷却过程中，Fe-Al的CN变为N ＝ 9。通过对CN，原子距离和原子环境变化的观察，我们提出了准晶相的局部结构有序性，该准晶相是从液态经由ω相产生的。在这项研究中，我们对相变过程中从晶相到准晶相的原子环境有了清晰的了解，这为功能性QC纳米材料的合成提供了更好的理解。

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