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

Berg, LK ; Gjonnes, J ; Hansen, V ; Li, XZ ; Knutson-Wedel, M ; Waterloo, G ; Schryvers, D and Wallenberg, LR LU (2001) In Acta Materialia 49(17). p.3443-3451
Abstract
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... (More)
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. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
aluminum alloys, transmission electron microscopy (TEM), electron diffraction, nucleation growth, Guinier-Preston zones
in
Acta Materialia
volume
49
issue
17
pages
9 pages
publisher
Elsevier
external identifiers
  • scopus:0035834218
ISSN
1359-6454
DOI
10.1016/S1359-6454(01)00251-8
language
English
LU publication?
yes
id
9ea9edf6-0f4f-4596-9c55-29a35983622c
date added to LUP
2023-10-31 16:35:24
date last changed
2023-11-02 15:05:42
@article{9ea9edf6-0f4f-4596-9c55-29a35983622c,
  abstract     = {{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.}},
  author       = {{Berg, LK and Gjonnes, J and Hansen, V and Li, XZ and Knutson-Wedel, M and Waterloo, G and Schryvers, D and Wallenberg, LR}},
  issn         = {{1359-6454}},
  keywords     = {{aluminum alloys; transmission electron microscopy (TEM); electron diffraction; nucleation growth; Guinier-Preston zones}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{17}},
  pages        = {{3443--3451}},
  publisher    = {{Elsevier}},
  series       = {{Acta Materialia}},
  title        = {{GP-zones in Al-Zn-Mg alloys and their role in artificial aging}},
  url          = {{http://dx.doi.org/10.1016/S1359-6454(01)00251-8}},
  doi          = {{10.1016/S1359-6454(01)00251-8}},
  volume       = {{49}},
  year         = {{2001}},
}