New type of Al-based decagonal quasicrystal in Al₆₀Cr₂₀Fe₁₀Si₁₀ alloy

Authors

• Zhanbing He, University of Science and Technology BeijingFollow
• Haikun Ma, University of Science and Technology Beijing
• Hua Li, University of Science and Technology Beijing
• Xingzhong Li, University of Nebraska-LincolnFollow
• Xiuliang Ma, Shenyang National Laboratory for Materials Science

Document Type

Article

Date of this Version

3-2016

Citation

He, Z. et al. New type of Al-based decagonal quasicrystal in Al₆₀Cr₂₀Fe₁₀Si₁₀ alloy. Sci. Rep. 6, 22337; doi: 10.1038/srep22337 (2016).

Comments

This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract

A new kind of decagonal quasicrystal (DQC) with a periodicity of 1.23 nm was observed in the as-cast quaternary Al₆₀Cr₂₀Fe₁₀Si₁₀ 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.