Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 47A, Issue 3, Pages 985-989Publisher
SPRINGER
DOI: 10.1007/s11661-015-3296-3
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Funding
- Monash Graduate Scholarship (MGS)
- International Monash Postgraduate Research Scholarship (IMPRS)
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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. (C) The Minerals, Metals & Materials Society and ASM International 2016
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