HAADF-STEM study on the early stage of precipitation in aged Al-Ag alloys

Toyohiko J. Konno, Eiji Okunishi, Tetsu Ohsuna, Kenji Hiraga

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1 Citation (Scopus)


We report on the structure of Ag precipitates in aged Al-Ag alloys using transmission electron microscopy and high-angle annular detector dark-field scanning transmission electron microscopy (HAADF-STEM). Irregularly shaped small Ag particles of 1-2 nm dominate the alloy annealed at 140°C for 10 h. These particles are present also within large precipitates (10-50 nm), which are often characterized by their {100} and {110} facets. In addition, atomic-resolution HAADF-STEM images revealed that Ag atoms tend to form {111} planar clusters, which criss-cross a colony of the irregularly shaped small Ag precipitates.

Original languageEnglish
Pages (from-to)611-616
Number of pages6
JournalJournal of Electron Microscopy
Issue number6
Publication statusPublished - 2004


  • Al-Ag aged alloy
  • Guinier-Preston zone
  • TEM


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