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On the stable Mg-Zn-Y quasicrystals

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Abstract

By the conventional air-cooled casting method, bulk ingots with a large fraction of stable Mg-Zn-Y icosahedral quasicrystals, both simple and face-centered, were obtained. The quasicrystal structures were directly confirmed by high-resolution electron microscopy (HREM) observations. The electron diffraction patterns from the quasicrystals were studied by computer simulations. A coexisting crys-talline phase of the quasicrystals was identified as the Mg7Zn3 phase, which was proved to be the (1/1) approximant of the quasicrystals. The quasicrystals were stable during a continuous heating process. However, at high temperature, oxidation occurred, and thus, Y2O3 and MgO products were formed. Oxidation at high temperatures is characteristic for the Mg-Zn-Y alloys and differs from Al-base alloys.

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Authors and Affiliations

  1. Beijing Institute of Aeronautical Materials, Beijing, and the Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, Beijing

    Z. P. Luo (Research Engineer)

  2. Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, 100080, Beijing, China

    H. X. Sui (Postdoctoral Student)

  3. Beijing Institute of Aeronautical Materials, 100095, Beijing, China

    S. Q. Zhang (Professor)

Authors
  1. Z. P. Luo
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  2. H. X. Sui
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  3. S. Q. Zhang
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Luo, Z.P., Sui, H.X. & Zhang, S.Q. On the stable Mg-Zn-Y quasicrystals. Metall Mater Trans A 27, 1779–1784 (1996). https://doi.org/10.1007/BF02651927

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  • DOI: https://doi.org/10.1007/BF02651927

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