Characterization of .BETA.' 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
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The β′ phase precipitated in a 95 at%Mg-5 at%Gd (Mg<SUB>95</SUB>Gd<SUB>5</SUB>) 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 <I>a</I>=0.64 nm, <I>b</I>=2.28 nm and <I>c</I>=0.52 nm and a composition of Mg<SUB>7</SUB>Gd. The β′ precipitates have a plate-shape with an about 40 nm width along the [001]<SUB>m</SUB> of the Mg-matrix and an about 100 nm length along [210]<SUB>m</SUB>-typed directions, and joining of the plate-shaped precipitates establishes a two-dimensional cell structure parallel to the (001)<SUB>m</SUB> plane of the Mg-matrix.
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The Japan Institute of Metals and Materials | 論文
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