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Understanding the Origins of Intergranular Corrosion in Copper-Containing Al-Mg-Si Alloys

journal contribution
posted on 2023-08-22, 23:15 authored by SK Kairy, T Alam, PA Rometsch, CHJ Davies, R Banerjee, N Birbilis
A definitive understanding of the mechanism of intergranular corrosion (IGC) in under-aged (UA) Cu-containing Al-Mg-Si alloys has not been clear to date. The grain boundary microstructure and chemistry in an UA Cu-containing Al-Mg-Si alloy were characterized by coupling atom probe tomography and scanning transmission electron microscopy. The rapid formation of an ultra-thin wetting Cu layer and discrete Q-phase (Al4Cu2Mg8Si7) precipitates along the grain boundaries, and a precipitate-free zone adjacent to the grain boundaries in the UA condition contribute to IGC.

History

Journal

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Volume

47

Pagination

985-989

Location

Berlin, Germany

ISSN

1073-5623

eISSN

1543-1940

Language

English

Publication classification

C1.1 Refereed article in a scholarly journal

Issue

3

Publisher

SPRINGER