Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-27T00:37:47.861Z Has data issue: false hasContentIssue false
  • English
  • Français

Crystal Structures of Long-Period Stacking-Ordered Phases in the Mg-TM-RE Ternary Systems

Published online by Cambridge University Press:  14 January 2013

Kyosuke Kishida ,
Hideyuki Yokobayashi ,
Atsushi Inoue  and
Haruyuki Inui
Kyosuke Kishida
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, JAPAN
Hideyuki Yokobayashi
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, JAPAN
Atsushi Inoue
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, JAPAN
Haruyuki Inui
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, JAPAN
Get access

Abstract

Crystal structures of long-period stacking-ordered (LPSO) phases in the Mg-TM (transition-metal)-RE(rare-earth) systems were investigated by atomic resolution high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). The 18R-type LPSO phase is constructed by stacking 6-layer structural blocks, each of which contains four consecutive close-packed planes enriched with TM and RE atoms. Formation of the TM6RE8 clusters with the L12 type atomic arrangement is commonly observed in both Mg-Al-Gd and Mg-Zn-Y LPSO phases. The difference between the crystal structures of Mg-Al-Gd and Mg-Zn-Y LPSO phases can be interpreted as the difference in the in-plane ordering of the TM6RE8 clusters in the structural block. The Mg-Al-Gd LPSO phase exhibits a long-range in-plane ordering of Gd and Al, which can be described by the periodic arrangement of the Al6Gd8 clusters with the L12 type atomic arrangement on lattice points of a two-dimensional 2$\sqrt 3 $aMg × 2$\sqrt 3 $aMg primitive hexagonal lattice, although the LPSO phase in the Zn/Y-poor Mg-Zn-Y alloys exhibits a shortrange in-plane ordering of the Zn6Y8 clusters.

Keywords

crystallographic structurescanning transmission electron microscopy (STEM)Mg
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 291 - 302
Copyright
Copyright © Materials Research Society 2013 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Kawamura, Y., Hayashi, K., and Inoue, A., Mater. Trans., 42, 1171 (2001).Google Scholar
Kawamura, Y., Kasahara, T., Izumi, S., and Yamasaki, M., Scripta Mater., 55, 453 (2006).CrossRefGoogle Scholar
Kawamura, Y. and Yamasaki, M., Mater. Trans., 48, 2986 (2007).CrossRefGoogle Scholar
Matsuda, M., Ii, S., Kawamura, Y., Ikuhara, Y. and Nishida, M., Mater. Sci. Eng. A, 393, 269 (2005).CrossRefGoogle Scholar
Yokobayashi, H., Kishida, K., Inui, H., Yamasaki, M., and Kawamura, Y. in Intermetallics- Based Alloys for Structural and Functional Applications, edited by Bewlay, B., Palm, M., Kumar, S., and Yoshimi, K. (Mater. Res. Soc. Symp. Proc., 1295, Warrendale, PA, 2011), pp. 267–272.Google Scholar
Pennycook, S.J., Lupini, A.R., Varela, M., Borisevich, A.Y., Peng, Y., Oxley, M.P. and Chisholm, M.F., in Scanning Transmission Electron Microscopy for Nanostructure Characterization, edited by Zhou, W. and Wang, Z.L., (Springer, New York, 2006) p.152.Google Scholar
Kishida, K. and Browning, N.D., Physica C 351, 281 (2001).10.1016/S0921-4534(00)01625-7CrossRefGoogle Scholar
Yokobayashi, H., Kishida, K., Inui, H., Yamasaki, M., and Kawamura, Y., Acta Mater., 59, 7287 (2011).CrossRefGoogle Scholar
Kishida, K., Yokobayashi, H., Inui, H., Yamasaki, M., and Kawamura, Y., Intermetallics., 31, 55 (2012).10.1016/j.intermet.2012.06.010CrossRefGoogle Scholar
Kishida, K., Yokobayashi, H., Inui, H., Yamasaki, M., and Kawamura, Y. in Mg2012: 9th International Conference on Magnesium Alloys and their Applications, edited by Poole, W.J. and Kainer, K.U. (ICMAA2012, Vancouver, BC, 2012), pp. 429–434.Google Scholar
Abe, E., Kawamura, Y., Hayashi, K. and Inoue, A., Acta Mater., 50, 3845 (2002).10.1016/S1359-6454(02)00191-XCrossRefGoogle Scholar
Dornberger-Schiff, K., Acta Cryst., 9, 593 (1956).CrossRefGoogle Scholar
Dornberger-Schiff, K. and Fichtner, K., Krist. Tech., 7, 1035 (1972).CrossRefGoogle Scholar
Kopský, V. and Litvin, D.B. DB (eds.), International Table for Crystallography, Vol. E, second ed., (John Wiley & Sons, Ltd., West Sussex, 2010).CrossRefGoogle Scholar
Hahn, Th. (ed.), International Table for Crystallography, Vol. A, fifth ed., (Springer, Dordrecht, 2005).Google Scholar
Merlino, S., in Modular aspects of minerals / EMU Notes in Mineralogy, Vol. 1, edited by Merlino, S., (Eötvös University Press, Budapest, 1999), p.29.Google Scholar