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

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

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 sca...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2016-03, Vol.47 (3), p.985-989
Hauptverfasser: Kairy, Shravan K., Alam, Talukder, Rometsch, Paul A., Davies, Chris H. J., Banerjee, Raj, Birbilis, Nick
Format: Artikel
Sprache:eng
Schlagworte:
Alloys
Characterization and Evaluation of Materials
Chemistry and Materials Science
Communication
Copper
Corrosion
Materials Science
Metallic Materials
Metallurgy
Microstructure
Nanotechnology
Structural Materials
Surfaces and Interfaces
Thin Films
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Zusammenfassung: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 (Al 4 Cu 2 Mg 8 Si 7 ) precipitates along the grain boundaries, and a precipitate-free zone adjacent to the grain boundaries in the UA condition contribute to IGC.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-015-3296-3