Extra Electron Diffraction Spots Caused by Fine Precipitates Formed at the Early Stage of Aging in Al-Mg-X (X=Si, Ge, Zn)-Cu Alloys

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  • Matsuda Kenji
    Graduate School of Science and Engineering for Research, University of Toyama
  • Kawai Akihiro
    Graduate School of Science and Engineering for Education, University of Toyama
  • Watanabe Katsumi
    Graduate School of Science and Engineering for Education, University of Toyama
  • Lee Seungwon
    Graduate School of Science and Engineering for Research, University of Toyama
  • Marioara Calin D.
    Department of Synthesis and Properties, SINTEF Materials and Chemistry
  • Wenner Sigurd
    Department of Physics, Norwegian University of Science and Technology (NTNU)
  • Nishimura Katsuhiko
    Graduate School of Science and Engineering for Research, University of Toyama
  • Matsuzaki Teiichiro
    RIKEN Nishina Center for Accelerator Based Science, RIKEN
  • Nunomura Norio
    Information Technology Center, University of Toyama
  • Sato Tatsuo
    Tokyo Institute of Technology
  • Holmestad Randi
    Department of Physics, Norwegian University of Science and Technology (NTNU)
  • Ikeno Susumu
    Graduate School of Science and Engineering for Research, University of Toyama

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<p>Age-hardenable Al-Mg-Si, Al-Mg-Ge, and Al-Zn-Mg alloys including Cu were investigated by transmission electron microscopy to understand extra diffraction spots that appear in their selected area electron diffraction patterns. These alloys containing Cu exhibit similar extra diffracted spots to each other with diffracted spots or streaks for Al matrix and major precipitates in each alloy. The extra spots cannot be confirmed in Cu-free alloys. The initial cluster, which is based on the β''-phase in the Al-Mg-Si alloy, is proposed to be MgSi(/Ge)Mg, CuMgSi(/Ge), AlCuMg, and AlZnMg, while the second clusters, which consist of three initial clusters including anti-phase boundary short-range order, are proposed for Cu-containing alloys.</p>

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