Growth ledges on silver-segregated θ′ (Al2Cu) precipitates

  • Julian Rosalie
  • Laure Bourgeois
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The interfacial structure and composition of θ′ (Al2Cu) precipitates in Al-0.9at.%Cu-0.9at.%Ag alloys were examined using high resolution electron microscopy. High angle annular dark field scanning transmission electron microscope (HAADF-STEM) images showed the presence of a silver(Ag)-rich bi-layer on the coherent (100) θ′-Al interfaces of the precipitates (1). Despite the presence of this layer, growth ledges were observed on the θ′ phase and thickening of the precipitates was able to proceed via ledges of step height 0.5c(θ′).


Aluminium alloys Segregation Interfaces Ledges Precipitation 


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Copyright information

© The Minerals, Metals & Materials Society 2016

Authors and Affiliations

  • Julian Rosalie
    • 1
  • Laure Bourgeois
    • 2
  1. 1.National Institute for Materials ScienceTsukuba, IbarakiJapan
  2. 2.Monash Centre for Electron MicroscopyMonash UniversityMelbourneAustralia

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