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A combined approach to microstructure mapping of an Al-Li AA2199 friction stir weld

Steuwer, Axel LU ; Dumont, M.; Altenkirch, J.; Birosca, S.; Deschamps, A.; Prangnell, P. B. and Withers, P. J. (2011) In Acta Materialia 59(8). p.3002-3011
Abstract
A wide range of complementary techniques are used to build up a detailed picture of the microstructural zones found in friction stir welds (FSW) in an advanced AA2199 Al-Li alloy. Neutron and synchrotron X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, small angle X-ray scattering, scanning electron microscopy, electron backscatter diffraction (EBSD) and hardness mapping are brought together to build up a detailed two-dimensional picture of the grain morphology, precipitate type, size, volume fraction and matrix solute content across the weld cross section and to explain the general lack of a W-shaped hardness profile across FSW in third-generation Al-Li-Cu Mg alloys. Dissolution of the age-hardening... (More)
A wide range of complementary techniques are used to build up a detailed picture of the microstructural zones found in friction stir welds (FSW) in an advanced AA2199 Al-Li alloy. Neutron and synchrotron X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, small angle X-ray scattering, scanning electron microscopy, electron backscatter diffraction (EBSD) and hardness mapping are brought together to build up a detailed two-dimensional picture of the grain morphology, precipitate type, size, volume fraction and matrix solute content across the weld cross section and to explain the general lack of a W-shaped hardness profile across FSW in third-generation Al-Li-Cu Mg alloys. Dissolution of the age-hardening phases occurred in different regions of the weld, depending on their respective solvus temperatures, with 5' dissolving within the heat-affected zone and T-1 coarsening in the thermo-mechanically affected zone before going into solution in the weld nugget. Changes to the precipitate distribution, and especially to the T1 phase, are linked to a significant reduction in hardness (strength) and unstrained lattice parameter across the weld zone. It was also possible to show that the low recovery of nugget zone hardness is primarily due to its poor natural ageing response. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Friction stir welding, Aluminium alloys, Small angle synchrotron X-ray, scattering, Neutron diffraction, Synchrotron radiation
in
Acta Materialia
volume
59
issue
8
pages
3002 - 3011
publisher
Elsevier
external identifiers
  • wos:000290053100010
  • scopus:79953175004
ISSN
1873-2453
DOI
10.1016/j.actamat.2011.01.040
language
English
LU publication?
yes
id
38b52deb-4363-454b-a288-8ced93b50c21 (old id 1964738)
date added to LUP
2011-05-23 14:17:47
date last changed
2017-09-24 03:02:55
@article{38b52deb-4363-454b-a288-8ced93b50c21,
  abstract     = {A wide range of complementary techniques are used to build up a detailed picture of the microstructural zones found in friction stir welds (FSW) in an advanced AA2199 Al-Li alloy. Neutron and synchrotron X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, small angle X-ray scattering, scanning electron microscopy, electron backscatter diffraction (EBSD) and hardness mapping are brought together to build up a detailed two-dimensional picture of the grain morphology, precipitate type, size, volume fraction and matrix solute content across the weld cross section and to explain the general lack of a W-shaped hardness profile across FSW in third-generation Al-Li-Cu Mg alloys. Dissolution of the age-hardening phases occurred in different regions of the weld, depending on their respective solvus temperatures, with 5' dissolving within the heat-affected zone and T-1 coarsening in the thermo-mechanically affected zone before going into solution in the weld nugget. Changes to the precipitate distribution, and especially to the T1 phase, are linked to a significant reduction in hardness (strength) and unstrained lattice parameter across the weld zone. It was also possible to show that the low recovery of nugget zone hardness is primarily due to its poor natural ageing response. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.},
  author       = {Steuwer, Axel and Dumont, M. and Altenkirch, J. and Birosca, S. and Deschamps, A. and Prangnell, P. B. and Withers, P. J.},
  issn         = {1873-2453},
  keyword      = {Friction stir welding,Aluminium alloys,Small angle synchrotron X-ray,scattering,Neutron diffraction,Synchrotron radiation},
  language     = {eng},
  number       = {8},
  pages        = {3002--3011},
  publisher    = {Elsevier},
  series       = {Acta Materialia},
  title        = {A combined approach to microstructure mapping of an Al-Li AA2199 friction stir weld},
  url          = {http://dx.doi.org/10.1016/j.actamat.2011.01.040},
  volume       = {59},
  year         = {2011},
}