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

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 AlZnMg hardening precipitates have been solved by HAADFSTEM 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 STEMEELS 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 ZnMg precipitates.

Category

Academic article

Client

  • Research Council of Norway (RCN) / 221714

Language

English

Author(s)

Affiliation

  • Norwegian University of Science and Technology
  • SINTEF Industry / Materials and Nanotechnology
  • University of Rouen Normandy
  • United Kingdom

Year

2014

Published in

Materials Science Forum

ISSN

0255-5476

Publisher

Trans Tech Publications

Volume

794-796

Page(s)

63 - 67

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