Materials Transactions Online

Materials Transactions, Vol.48 No.01 (2007) pp.84-87
© 2007 The Japan Institute of Metals

Characterization of β' Precipitate Phase in Mg-2 at%Y Alloy Aged to Peak Hardness Condition by High-Angle Annular Detector Dark-Field Scanning Transmission Electron Microscopy (HAADF-STEM)

Masahiko Nishijima, Kunio Yubuta and Kenji Hiraga

Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

The β' phase precipitated in an Mg-2 at%Y (Mg98Y2) alloy aged to a peak hardness condition at 200°C for 336 h has been studied by high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). The β' precipitates have an about 20 nm size and definite facets parallel to the (010) plane, and Y-enriched double atom planes parallel to the (010) plane grow long and sometimes individually along the [100] and [001] directions. This morphology of the β' precipitates in the Mg98Y2 alloy is remarkably different from that in an Mg95Gd5 alloy.

(Received 2006/9/29; Accepted 2006/11/20; Published 2006/12/25)

Keywords: magnesium alloy, magnesium-rare earth alloy, magnesium-yttrium, Mg-Y, precipitate, high-angle annular detector dark-field scanning transmission electron microscopy

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