Atomic-resolution elemental mapping of precipitates in a 7449 aluminium alloy

Sigurd Wenner; Calin D. Marioara; Williams Lefebvre; Quentin M Ramasse; Despoina Maria Kepaptsoglou; Fredrik S. Hage; Randi Holmestad

doi:10.4028/www.scientific.net/MSF.794-796.63

Atomic-resolution elemental mapping of precipitates in a 7449 aluminium alloy

Sigurd Wenner^*, Calin D. Marioara, Williams Lefebvre, Quentin M Ramasse, Despoina Maria Kepaptsoglou, Fredrik S. Hage, Randi Holmestad

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article

Abstract

The high-strength weldable 7xxx series of aluminium alloys are of great importance to the aeronautics industry. Only recently, the complex structures of the Al-Zn-Mg hardening precipitates have been solved by HAADF-STEM imaging and first-principles calculations. However, perfect models of precipitate structures are often insufficient as several elements may be mixed into precipitate compositions. We have investigated this effect by STEM-EELS spectrum imaging with an aberration-corrected microscope. In a 7449 alloy, Cu and Al were found to replace atoms at certain sites in both metastable and equilibrium Zn-Mg precipitates.

Original language	English
Pages (from-to)	63-67
Number of pages	5
Journal	Materials Science Forum
Volume	794-796
DOIs	https://doi.org/10.4028/www.scientific.net/MSF.794-796.63
Publication status	Published - 2014
Event	14th International Conference on Aluminium Alloys, ICAA 2014 - Trondheim, Norway Duration: 15 Jun 2014 → 19 Jun 2014

Bibliographical note

cited By 2

Keywords

Al-Zn-Mg
Electron energy loss spectroscopy
Precipitation
Transmission electron microscopy

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10.4028/www.scientific.net/MSF.794-796.63

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Cite this

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abstract = "The high-strength weldable 7xxx series of aluminium alloys are of great importance to the aeronautics industry. Only recently, the complex structures of the Al-Zn-Mg hardening precipitates have been solved by HAADF-STEM imaging and first-principles calculations. However, perfect models of precipitate structures are often insufficient as several elements may be mixed into precipitate compositions. We have investigated this effect by STEM-EELS spectrum imaging with an aberration-corrected microscope. In a 7449 alloy, Cu and Al were found to replace atoms at certain sites in both metastable and equilibrium Zn-Mg precipitates.",

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note = "cited By 2; 14th International Conference on Aluminium Alloys, ICAA 2014 ; Conference date: 15-06-2014 Through 19-06-2014",

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AU - Wenner, Sigurd

AU - Marioara, Calin D.

AU - Lefebvre, Williams

AU - Ramasse, Quentin M

AU - Kepaptsoglou, Despoina Maria

AU - Hage, Fredrik S.

AU - Holmestad, Randi

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PY - 2014

Y1 - 2014

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AB - The high-strength weldable 7xxx series of aluminium alloys are of great importance to the aeronautics industry. Only recently, the complex structures of the Al-Zn-Mg hardening precipitates have been solved by HAADF-STEM imaging and first-principles calculations. However, perfect models of precipitate structures are often insufficient as several elements may be mixed into precipitate compositions. We have investigated this effect by STEM-EELS spectrum imaging with an aberration-corrected microscope. In a 7449 alloy, Cu and Al were found to replace atoms at certain sites in both metastable and equilibrium Zn-Mg precipitates.

KW - Al-Zn-Mg

KW - Electron energy loss spectroscopy

KW - Precipitation

KW - Transmission electron microscopy

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VL - 794-796

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JO - Materials Science Forum

JF - Materials Science Forum

T2 - 14th International Conference on Aluminium Alloys, ICAA 2014

Y2 - 15 June 2014 through 19 June 2014

ER -

Atomic-resolution elemental mapping of precipitates in a 7449 aluminium alloy

Abstract

Bibliographical note

Keywords

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