A 12R long-period stacking-ordered structure in a Mg-Ni-Y alloy. Issue 12 (December 2018)

• Record Type: Journal Article
• Authors: Liu, Cheng; Zhu, Yuman; Luo, Qun; Liu, Bin; Gu, Qinfen; Li, Qian
• Is Part Of: Journal of materials science & technology. Volume 34:Issue 12(2018)
• Page Start: 2235
• Page End: 2239
• Publication Date: 2018-12
• Subjects: Mg alloys -- LPSO -- HAADF-STEM -- Crystal structure; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2018.06.015
• Languages: English
• ISSNs: 1005-0302

Abstract

Abstract: A hitherto unreported long-period stacking-ordered (LPSO) phase, designated 12R, was observed in a Mg80 Ni5 Y15 (at.%) alloy. Microstructure was investigated by electron diffraction and high-angle annular dark-field scanning transmission electron microscopy. Results show that the 12R has a trigonal lattice ( a = b = 1.112 nm, c = 3.126 nm, α = β = 90°, and γ = 120°). Unit cell of the 12R is consisted of three ABCA-type building blocks and each building block contains dominant Ni6 Y8 -type building clusters. A sound structural model is proposed based on relative positions of Ni6 Y8 clusters in neighboring building blocks.