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

Shravan K. Kairy; Talukder Alam; Paul A. Rometsch; Chris H.J. Davies; Raj Banerjee; Nick Birbilis

doi:10.1007/s11661-015-3296-3

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

Shravan K. Kairy^*, Talukder Alam, Paul A. Rometsch, Chris H.J. Davies, Raj Banerjee, Nick Birbilis

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

48 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	985-989
Number of pages	5
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	47
Issue number	3
DOIs	https://doi.org/10.1007/s11661-015-3296-3
Publication status	Published - 1 Mar 2016
Externally published	Yes

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abstract = "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.",

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AU - Birbilis, Nick

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AB - 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.

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

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