A closer look at constituent induced localised corrosion in Al-Cu-Mg alloys. (December 2016)

• Record Type: Journal Article
• Authors: Birbilis, N.; Zhu, Y.M.; Kairy, S.K.; Glenn, M.A.; Nie, J.-F.; Morton, A.J.; Gonzalez-Garcia, Y.; Terryn, H.; Mol, J.M.C.; Hughes, A.E.
• Is Part Of: Corrosion science. Volume 113(2016)
• Page Start: 160
• Page End: 171
• Publication Date: 2016-12
• Subjects: A: aluminium -- A: intermetallics -- B: TEM -- B: STEM -- C: pitting corrosion -- AA2024; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.10.018
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Constituent particle in AA2024-T3 uniquely characterised as multiphase. High resolution electron microscopy reveals structural and chemical complexity of constituent particle. Unambiguous characterisation reveals unreported constituent particle crystal structure. Localised corrosion related to constituent particle composition. 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.