Effect of Localized Corrosion on Fatigue–Crack Growth in 2524-T3 and 2198-T851 Aluminum Alloys Used as Aircraft Materials

Journal Article · Sun Apr 15 04:00:00 EDT 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3244-7· OSTI ID:22860593

Broday, E. E. ^[1]; Rossino, L. S. ^[2]; Fernandes, J. C. S. ^[3]; Bose Filho, W. W. ^[4]

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1. Federal University of Technology of Paraná (UTFPR), Department of Production Engineering (Brazil)
2. Sorocaba Technological College (FATEC) (Brazil)
3. University of Lisbon, Department of Chemical Engineering, Instituto Superior Técnico (Portugal)
4. University of São Paulo, Department of Materials Engineering (Brazil)

Corrosion and fatigue of aluminum alloys are major issues for the in-service life assessment of aircraft structures and for the management of aging air fleets. The aim of this work was to evaluate the effect of localized corrosion on fatigue crack growth (FCG) resistance of the AA2198-T851 Al-Li alloy (Solution Heat Treated, Cold Worked, and Artificially Aged), comparing it with the FCG resistance of AA2524-T3 (Solution Heat Treated and Cold Worked), considering the effect of seawater fog environment. Before fatigue tests, the corrosion behavior of 2198-T851 and 2524-T3 aluminum alloys was verified using open circuit potential and potentiodynamic polarization techniques. Fatigue in air and corrosion fatigue tests were performed applying a stress ratio (R) of 0.1, 15 Hz (air) and 0.1 Hz (seawater fog) frequencies, using a sinusoidal waveform in all cases. The results showed that the localized characteristics of the 2198-T851 and 2524-T3 aluminum alloys are essentially related to the existence of intermetallic compounds, which, due to their different nature, may be cathodic or anodic in relation to the aluminum matrix. The corrosive medium has affected the FCG rate of both aluminum alloys, in a quite similar way. Graphical Abstract: .

• OSTI ID: 22860593
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 4 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COMPARATIVE EVALUATIONS
CORROSION FATIGUE
CRACK PROPAGATION
HEAT TREATMENTS
INTERMETALLIC COMPOUNDS
POLARIZATION
SERVICE LIFE
STRESSES
WAVE FORMS