New stable icosahedral quasicrystal in the system Al–Cu–Co–Fe
| Autor: | Alexey Suslov, Natalia Tabachkova, Nikolay Andreev, Maria Klyueva, D. A. Shulyatev, Tatiana Sviridova |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Icosahedral symmetry Mechanical Engineering Metals and Alloys Analytical chemistry Quasicrystal 02 engineering and technology Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Electrical resistance and conductance Mechanics of Materials Phase (matter) Materials Chemistry Selected area diffraction 0210 nano-technology Chemical composition Phase diagram |
| Zdroj: | Journal of Alloys and Compounds. 801:478-482 |
| ISSN: | 0925-8388 |
| Popis: | Based on the conceptual Al–Cu–(Fe + Co) phase diagram we found an optimal initial composition and developed a method to grow Al–Cu–Fe–Co single-grain quasicrystals. Our original two-stage cooling process includes (i) fast cooling of the melt down to the quasicrystalline single phase region with rate of ∼165 K/h to prevent growing of nonquasicrystalline phases in the melt, and (ii) slow cooling down with rate of ∼2–3 K/h to grow large (mm-size) single-grain quasicrystals. As a result a new stable quaternary Al-based icosahedral quasicrystal has been obtained. The chemical composition of the grown quasicrystal determined by both the energy dispersive X-ray analysis and inductively coupled plasma mass spectrometry was Al64.36Cu22.20Co3.05Fe10.39. Powder XRD and selected area electron diffraction were carried out for the phase identification and confirmed the icosahedral structure. The temperature dependencies of the electrical resistance measured on the oriented samples in the temperature range of 1.4 K–300 K is typical for icosahedral quasicrystals. |
| Databáze: | OpenAIRE |
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