Materials Transactions Online

Materials Transactions, Vol.49 No.01 (2008) pp.227-229
© 2008 The Japan Institute of Metals

The Structure of Guinier-Preston Zones in an Mg-2 at%Gd-1 at%Zn Alloy Studied by Transmission Electron Microscopy

Masahiko Nishijima1, Kenji Hiraga1, Michiaki Yamasaki2 and Yoshihiko Kawamura2

1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2Department of Materials Science and Engineering, Kumamoto University, Kumamoto 860-8555, Japan

Planar Guinier-Preston zones (GP-zones) parallel to a basal plane of an Mg hexagonal lattice are found together with β' and β1 precipitates, which have been found in Mg-Gd alloys, in an Mg-2 at%Gd-1 at%Zn (Mg97Gd2Zn1) alloy aged at 200°C for 150 hrs. From the combination of high-resolution transmission electron microscopy (HRTEM) and high-angle annular detector dark field scanning transmission electron microscopy (HAADF-STEM), we can determine the structure of the GP-zone, in which Gd and/or Zn atoms occupy at ordered positions in two close-packed planes sandwiching a close-packed plane of Mg atoms.

(Received 2007/10/29; Accepted 2007/11/12; Published 2007/12/12)

Keywords: Guinier-Preston zone, GP-zone, magnesium-gadolinium-zinc, transmission electron microscopy, precipitate

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