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Microstructural Characterization of Long-Period Stacking Ordered Phases in Mg97Zn1Y2 (at.%) Alloy

Published online by Cambridge University Press:  30 July 2013

Xiaohong Shao ,
Huajie Yang ,
Jeff T.M. De Hosson  and
Xiuliang Ma
Xiaohong Shao
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Department of Applied Physics, Zernike Institute for Advanced Materials and Materials innovation institute M2i, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands
Huajie Yang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China Department of Applied Physics, Zernike Institute for Advanced Materials and Materials innovation institute M2i, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands
Jeff T.M. De Hosson*
Affiliation:
Department of Applied Physics, Zernike Institute for Advanced Materials and Materials innovation institute M2i, University of Groningen, Nijenborgh 4, 9747 AG Groningen, the Netherlands
Xiuliang Ma*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
*Corresponding author. E-mail: J.T.M.De.Hosson@rug.nl
**Corresponding author. E-mail: xlma@imr.ac.cn
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Abstract

Transmission electron microscopy characterization of two major long-period stacking ordered (LPSO) phases in Mg–Zn–Y alloy, i.e., 18R- and 14H-LPSO are reported. The space group and atomic-scale microstructures of both compounds were determined using a combination of electron diffraction, convergent beam electron diffraction, high-resolution transmission electron microscopy, and Z-contrast scanning transmission electron microscopy. The 18R-LPSO phase is demonstrated to have a point group and space group 3m and R3m (or 3m and R3m), with the lattice parameter a = 1.112 nm and c = 4.689 nm in a hexagonal coordinate system. The 14H-LPSO phase has a point group 6/mmm and a space group P63 /mmc, and the lattice parameter is a = 1.112 nm and c = 3.647 nm. In addition, insertion of extra thin Mg platelets of several atomic layers, results in stacking faults in the LPSO phase. These results may shed some new light on a better understanding of the microstructure and deformation mechanisms of LPSO phases in Mg alloys.

Keywords

Mg–Zn–Y alloyLPSO phasespace groupSTEM
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 19 , Issue 6 , December 2013 , pp. 1575 - 1580
Copyright
Copyright © Microscopy Society of America 2013 

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