Direct imaging of Guinier-Preston zones by high-angle annular detector dark-field scanning transmission electron microscopy

J. Konno, M. Kawasaki, K. Hiraga

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We report atomic resolution imaging of Cu-planar precipitates in aged Al-Cu alloys, known as Guinier-Preston (GP) zones, by high-angle annular detector dark-field scanning transmission electron microscopy. Single layered GP-I zones as small as 2 nm in length were resolved among densely populated GP-I zones, whereas double layered GP zones were clearly identified. The images of GP-II zones showed not only the commonly accepted structure, in which single Cu layers are separated by three Al layers, but also a variant, in which double Cu layers are separated by a single Al layer.

Original languageEnglish
Pages (from-to)105-111
Number of pages7
JournalJournal of Electron Microscopy
Volume50
Issue number2
DOIs
Publication statusPublished - 2001

Keywords

  • Aged alloy
  • Guinier-Preston zone
  • HAADF-STEM
  • Scanning transmission electron microscopy

ASJC Scopus subject areas

  • Instrumentation

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