MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Characterization of β′ Phase Precipitates in an Mg-5 at%Gd Alloy Aged in a Peak Hardness Condition, Studied by High-Angle Annular Detector Dark-Field Scanning Transmission Electron Microscopy
Masahiko NishijimaKenji HiragaMichiaki YamasakiYoshihito Kawamura
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2006 Volume 47 Issue 8 Pages 2109-2112

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Abstract

The β′ phase precipitated in a 95 at%Mg-5 at%Gd (Mg95Gd5) alloy aged in a peak hardness condition (at 200°C for 100 hrs) is studied by high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). Atomic-scaled HAADF-STEM observations of the β′ phase can propose a new structure model with an orthorhombic unit cell of a=0.64 nm, b=2.28 nm and c=0.52 nm and a composition of Mg7Gd. The β′ precipitates have a plate-shape with an about 40 nm width along the [001]m of the Mg-matrix and an about 100 nm length along [210]m-typed directions, and joining of the plate-shaped precipitates establishes a two-dimensional cell structure parallel to the (001)m plane of the Mg-matrix.

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© 2006 The Japan Institute of Metals and Materials
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