GP-zones in Al-Zn-Mg alloys and their role in artificial aging

  • Berg L
  • Gjoønnes J
  • Hansen V
 et al. 
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The structure of GP-zones in an industrial, 7xxx-series Al-Zn-Mg alloy has been investigated by transmission electron microscopy methods: selected area diffraction, conventional and high-resolution imaging. Two types of GP-zones, GP(I) and (II) are characterized by their electron diffraction patterns. GP(I)-zones are formed over a wide temperature range, from room temperature to 140-150°C, independently of quenching temperature. The GP(I)-zones are coherent with the aluminum matrix, with internal ordering of Zn and Al/Mg on the matrix lattice, suggested to be based on AuCu(I)-type sub-unit, and anti-phase boundaries. GP(II) are formed after quenching from temperatures above 450°C, by aging at temperatures above 70°C. The GP(II)-zones are described as zinc-rich layers on {111}-planes, with internal order in the form of elongated domains. The structural relation to the η′-precipitate is discussed. © 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All righ ts reserved.

Author-supplied keywords

  • Aluminum alloys
  • Electron diffraction
  • Guinier-Preston zones
  • Nucleation, growth
  • Transmission Electron Microscopy (TEM)

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  • L. K. Berg

  • J. Gjoønnes

  • V. Hansen

  • X. Z. Li

  • M. Knutson-Wedel

  • G. Waterloo

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