Characterization of β′ phase precipitates in an Mg-5at%Gd alloy aged in a peak hardness condition, studied by high-angle annular detector dark-field scanning transmission electron microscopy

Masahiko Nishijima, Kenji Hiraga, Michiaki Yamasaki, Yoshihito Kawamura

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

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 languageEnglish
Pages (from-to)2109-2112
Number of pages4
JournalMaterials Transactions
Volume47
Issue number8
DOIs
Publication statusPublished - 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

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