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

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.