New polytypes of long-period stacking ordered structures in a near-equilibrium Mg97Zn1Y2 alloy |
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| Authors: | Q Q Jin X B Hu Z Z Peng X L Ma |
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| Institution: | 1. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China;3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China;4. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, China |
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| Abstract: | By atomic-scale high-angle annular dark-field scanning transmission electron microscopy, the long-period stacking ordered (LPSO) structures in a near-equilibrium Mg97Zn1Y2 (at.%) alloy have been characterised. In addition to 18R and 14H, new polytypes of LPSO structures are analysed and determined as 60R, 78R, 26H, 96R, 38H, 40H, 108H and 246R. All of these LPSO structures feature AB′C′A building blocks with two Mg layers and three Mg layers sandwiched between them. The Bravais lattices and space groups of new polytypes of LPSO structures were easily determined via the newly introduced method. A structural relationship between the LPSOs is proposed. |
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| Keywords: | Magnesium alloys long-period stacking ordered (LPSO) structure scanning transmission electron microscopy electron diffraction |
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