Abstract
Ternary Mg-Y-Zn alloys have attracted considerable attention due to their unique microstructures and promising mechanical properties. The microstructure of these alloys contains predominantly intermetallic phases of 18R and/or 14H long-period stacking ordered (LPSO) structures, depending on the alloy processing conditions. Such 18R and/or 14H structures or similar LPSO structures are also found in other magnesium alloys such as Mg-Gd-Zn, Mg-Gd-Y-Zn, Mg-Dy-Zn, Mg-Ho-Zn, Mg-Er-Zn, Mg-Y-Cu, Mg-Y-Ni, and Mg-Y-Co. In addition, LPSO structures such as 24R and 10H have also been reported, even though they are less frequently observed. This paper provides a review of the current status on the characterization of the structure, thermal stability, transformation, and deformation of the LPSO structures using high-angle annular dark-field scanning transmission electron microscopy and electron diffraction. Unsolved issues on the LPSO structures are also highlighted and discussed.
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Notes
By shuffles we mean the movement of atoms over just a few atomic distances in contrast to diffusion which involves the long-range movement of atoms.
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Acknowledgments
The authors acknowledge gratefully the financial support from the Australian Research Council, the access to the facilities of the Monash Centre for Electron Microscopy and Yangxin Li and Ruiqi Chen for sample preparation.
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A.J. Morton has been a retired person, and work covered by this paper was done at Monash.
Manuscript submitted November 8, 2013.
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Nie, J.F., Zhu, Y.M. & Morton, A.J. On the Structure, Transformation and Deformation of Long-Period Stacking Ordered Phases in Mg-Y-Zn Alloys. Metall Mater Trans A 45, 3338–3348 (2014). https://doi.org/10.1007/s11661-014-2301-6
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DOI: https://doi.org/10.1007/s11661-014-2301-6