HRTEM observation of intermediate precipitates in Al-Mg-Si alloys containing Ag

Junya Nakamura, Kenji Matsuda, Tokimasa Kawabata, Tatsuo Sato, Yoshio Nakamura, Susumu Ikeno

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1 Citation (Scopus)

Abstract

This study uses high-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), and energy-dispersive X-ray spectroscopy to identify the crystal structure of a metastable phase in a Ag-added Al-Mg-Si alloy, which we compared with the crystal structure of the β′ -phase in Al-Mg-Si alloys without Ag. SAED patterns and HRTEM images of the β′ -phase in the Ag-added Al-Mg-Si alloy were similar to those of the β′ -phase in the Al-Mg-Si alloy without Ag. However, the lattice spacings were modified by the substitution of Ag into the β′ -phase. Analyses of the obtained HRTEM images and SAED patterns revealed that the β′ -phase has a more complex crystal lattice that consists of large (0.69 nm) and small (0.24 nm) hexagons. Discrete variational (DV-Xα) calculations were applied to the small cluster of the β′-phase. The results indicate that it should be possible to substitute silver in the β′- phase.

Original languageEnglish
Pages (from-to)179-187
Number of pages9
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume75
Issue number3
DOIs
Publication statusPublished - 2011 Mar

Keywords

  • Aluminum-magnesium-silicon alloy
  • Discrete variational (dv-xα) method
  • High resolution transmission electron microscopy
  • Precipitation
  • Selected area electron diffraction pattern
  • Silver addition

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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