A closer look at constituent induced localised corrosion in Al-Cu-Mg alloys

Birbilis, N.; Zhu, Y.M.; Kairy, S.K.; Glenn, MA; Nie, J.F.; Morton, A.J.; Gonzalez Garcia, Y.; Terryn, H.A.; Mol, J.M.C.; Hughes, A.E.

A closer look at constituent induced localised corrosion in Al-Cu-Mg alloys

Journal article (2016)

Authors

N. Birbilis Monash University

Y.M. Zhu Monash University

S.K. Kairy Monash University

MA Glenn CSIRO Mineral Resources

J.F. Nie Monash University

A.J. Morton CSIRO Mineral Resources, Monash University

Y. Gonzalez Garcia (OLD) MSE-6

H.A. Terryn Vrije Universiteit Brussel

J.M.C. Mol (OLD) MSE-6

A.E. Hughes Monash University, CSIRO Mineral Resources

Research Group

(OLD) MSE-6

AA2024 A: aluminium A: intermetallics B: TEM B: STEM C: pitting corrosion

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Published Date

2016

Language

English

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Research Group

(OLD) MSE-6

Abstract

The role of constituent intermetallic particles in the pitting corrosion of aluminium (Al) alloys is well recognised. A definitive quantification of the role of unique constituent particles has contributed towards an enhanced understanding of Al-alloy corrosion, however the complexity of Al-alloy microstructures warrants further attention. In the present work we identify a unique intermetallic type in contemporary versions of AA2024-T3, which has a two-phase structure, defined by two distinct crystal types, and distinct compositions. Detailed characterisation is used to unambiguously define this constituent, along with its role in localised corrosion.