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

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.

Gjonnes, JUniversity of Oslo (författare)
Hansen, VUniversity of Oslo (författare)
Li, XZUniversity of Oslo (författare)
Knutson-Wedel, MChalmers University of Technology (författare)
Waterloo, GNorsk Hydro ASA (författare)
Schryvers, DUniversity of Antwerp (författare)
Wallenberg, LRLund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)ook2-rwa (författare)
Chalmers University of TechnologyUniversity of Oslo (creator_code:org_t)

Av författaren/redakt...: Berg, LK; Gjonnes, J; Hansen, V; Li, XZ; Knutson-Wedel, M; Waterloo, G; visa fler...; Schryvers, D; Wallenberg, LR; visa färre...

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