GP-zones in Al-Zn-Mg alloys and their role in artificial aging
(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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- author
- Berg, LK ; Gjonnes, J ; Hansen, V ; Li, XZ ; Knutson-Wedel, M ; Waterloo, G ; Schryvers, D and Wallenberg, LR LU
- organization
- publishing date
- 2001-10-09
- 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}}, }