Abstract
The β′ phase precipitated in a 95 at%Mg-5 at%Gd (Mg 95Gd5) alloy aged in a peak hardness condition (at 200°C for 100hrs) 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 = 0.64nm, b = 2.28nm 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.
Original language | English |
---|---|
Pages (from-to) | 2109-2112 |
Number of pages | 4 |
Journal | Materials Transactions |
Volume | 47 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2006 Aug |
Keywords
- Magnesium alloy
- Magnesium-gadolinium
- Magnesium-rare earth alloy
- Precipitate
- Precipitation hardness
- β′ phase
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering