Synergistic Balance of Strength and Corrosion Resistance in Al–Mg–Er Alloys

High-strength, corrosion-resistant, and lightweight Al–Mg alloys perform an important function in harsh coastal service environments. Corrosion resistance is generally inversely correlated with strength; hence, it is difficult to simultaneously optimize both. In this study, a low-magnesium Er-contai...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2020-05, Vol.33 (5), p.659-670
Main Authors: Zhou, Haifei, Qian, Zhouhai, Zhou, Mengcheng, Liu, Xuebing, Li, Yong, Zhang, Xinfang
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Aluminum base alloys
Annealing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Corrosion environments
Corrosion potential
Corrosion resistance
Corrosion resistant alloys
Corrosion tests
Crack initiation
Dislocation pinning
Electrodes
Grain boundaries
Heat treatment
High strength alloys
Intermetallic compounds
Magnesium
Materials Science
Mechanical properties
Metallic Materials
Morphology
Nanotechnology
Organometallic Chemistry
Rare earth elements
Recrystallization
Scanning electron microscopy
Solid solutions
Spectroscopy/Spectrometry
Tribology
Work stations
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Summary:High-strength, corrosion-resistant, and lightweight Al–Mg alloys perform an important function in harsh coastal service environments. Corrosion resistance is generally inversely correlated with strength; hence, it is difficult to simultaneously optimize both. In this study, a low-magnesium Er-containing Al-based alloy that is stronger and more corrosion resistant than Al-based alloys have been reported. The alloy contains Er, and the precipitation of Al 3 Er within a face-centered cubic matrix is obtained by a series of smelting–casting, heat treatment, and rolling processes. It is presumed that the strengthening phase of Al 3 Er pinning dislocations improves alloy strength. It also increases the recrystallization temperature of cold-rolled matrix and induces the distribution of small-angle grain boundaries, thus allowing the alloy to achieve excellent environmental corrosion resistance. As a result, strength and corrosion resistance are simultaneously improved.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-020-01007-1