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Stacking Faults and Growth Twins in Long‐Period Stacking‐Ordered Structures in Mg–Co–Y Alloys
Author(s) -
Jin Qianqian,
Shao Xiaohong,
Peng Zhenzhen,
Zhou Yangtao,
Zhang Bo,
Zheng Shijian,
Ma Xiuliang
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901029
Subject(s) - stacking , materials science , transmission electron microscopy , crystallography , scanning transmission electron microscopy , period (music) , point reflection , condensed matter physics , nanotechnology , chemistry , nuclear magnetic resonance , physics , acoustics
Herein, by atomic‐scale high‐angle annular dark field scanning transmission electron microscopy, the structure, symmetry, and distribution of stacking faults (SFs) and growth twins in 12H, 15R, and 18R long‐period stacking‐ordered (LPSO) structures in Mg 88 Co 5 Y 7 and Mg 92 Co 2 Y 6 (at%) as‐cast alloys are characterized. The SFs or growth twins in LPSO structures are denoted as the faulted arrangement of n ‐Mg components, and some of them possess inversion centers or mirror symmetry. The formation of SFs or growth twins in 15R and 18R structures depends on whether the sum of Mg layers in all the n ‐Mg components of the defect is an even number or an odd number, whereas only SFs form in 12H structures. Various types of SFs or SFs of the same kind can distribute locally in the LPSO structures in Mg–Co–Y alloys, and then some other LPSO structures with a longer period are detected via orderly distribution of SFs.