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Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy

Abstract

Stress corrosion cracking (SCC) in Cu-free Al-Zn-Mg (7xxx) aluminium alloys limits its
use in many applications. In this work, we study in detail the microstructure of a peak and slightly
overaged condition in an AA7003 alloy using transmission- and scanning electron microscopy in
order to provide a comprehensive understanding of the microstructural features related to SCC.
The SCC properties have been assessed using the double cantilever beam method and slow strain
rate tensile tests. Grain boundary particles, precipitate free zones, and matrix precipitates have
been studied. A difference in the SCC properties is established between the two ageing conditions.
The dominating difference is the size and orientation of the hardening phases. Possible explanations
correlating the microstructure and SCC properties are discussed.

Category

Academic article

Client

  • NORTEM / 197405
  • Research Council of Norway (RCN) / 247598

Language

English

Author(s)

Affiliation

  • Norwegian University of Science and Technology
  • SINTEF Industry / Materials and Nanotechnology
  • University of Cambridge
  • Diverse norske bedrifter og organisasjoner

Year

2020

Published in

Metals

ISSN

2075-4701

Publisher

MDPI

Volume

10

Issue

9

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