title: New type of Al-based decagonal quasicrystal in Al60Cr20Fe10Si10 alloy.
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.
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Zhanbing
authors.initials: Z
authors.lastname: He
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Haikun
authors.initials: H
authors.lastname: Ma
authors.affiliation: State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Li
authors.affiliation: Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588-0656, USA.
authors.forename: Xingzhong
authors.initials: X
authors.lastname: Li
authors.affiliation: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Wenhua Road 72, 110016 Shenyang, China.
authors.forename: Xiuliang
authors.initials: X
authors.lastname: Ma