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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

Language

English

Author(s)

Affiliation

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

Year

2014

Published in

Materials Science Forum

ISSN

0255-5476

Volume

794-796

Page(s)

63 - 67

View this publication at Norwegian Research Information Repository