New type of Al-based decagonal quasicrystal in Al(60)Cr(20)Fe(10)Si(10) alloy

A new kind of decagonal quasicrystal (DQC) with a periodicity of 1.23 nm was observed in the as-cast quaternary Al(60)Cr(20)Fe(10)Si(10) alloy. The intensity distribution of some spots in the selected-area electron diffraction pattern along the tenfold zone axis was found to be different from other...

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Detalles Bibliográficos
Autores principales: He, Zhanbing, Ma, Haikun, Li, Hua, Li, Xingzhong, Ma, Xiuliang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4772379/
https://www.ncbi.nlm.nih.gov/pubmed/26928759
http://dx.doi.org/10.1038/srep22337
Descripción
Sumario:A new kind of decagonal quasicrystal (DQC) with a periodicity of 1.23 nm was observed in the as-cast quaternary Al(60)Cr(20)Fe(10)Si(10) alloy. The intensity distribution of some spots in the selected-area electron diffraction pattern along the tenfold zone axis was found to be different from other Al-based DQCs. High-angle annular dark-field scanning transmission electron microscopy was adopted to reveal the structural features at an atomic level. Both the tenfold symmetry and symmetry-broken decagonal (D) clusters of 1.91 nm in diameter were found, but with structural characteristics different from the corresponding D clusters in the other Al-based DQCs. The neighboring D clusters are connected by sharing one edge rather than covering, suggesting the tiling model is better than the covering model for structural description.

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