Precipitates with peculiar morphology consisting of a disk-shaped amorphous core sandwiched between 14H-typed long period stacking order crystals in a melt-quenched Mg98Cu1y1 alloy

Makoto Matsuura, Kazuya Konno, Mitsuhiko Yoshida, Masahiko Nishijima, Kenji Hiraga

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

Abstract

The microstructure of a melt-quenched Mg98CU1Y 1 alloy has been studied by high-resolution transmission electron microscopy (HRTEM) and high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). We have found Cu- and Y-rich precipitates, which are uniformly dispersed in Mg-matrix grains. The precipitates are aligned parallel to the c-plane of the Mg-matrix crystal, and have the peculiar morphology consisting of a disk-shaped amorphous core sandwiched between 14H-typed long period stacking order (LPSO) crystals. A relatively stable supper-cooled liquid phase in an Mg-Cu-Y alloy system, and the formation and growth of the LPSO crystals from the amorphous phase are responsible for the peculiar morphology of the precipitates.

Original languageEnglish
Pages (from-to)1264-1267
Number of pages4
JournalMaterials Transactions
Volume47
Issue number4
DOIs
Publication statusPublished - 2006 Apr

Keywords

  • Amorphous
  • High-angle annular detector dark-field scanning transmission electron microscopy
  • High-resolution transmission electron microscopy
  • Long period stacking order
  • Magnesium-cupper-yttrium
  • Precipitate

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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