Publication Type Journal Article
Title Effect of Localized Corrosion on Fatigue-Crack Growth in 2524-T3 and 2198-T851 Aluminum Alloys Used as Aircraft Materials
Authors J. A. Moreto E. E. Broday L. S. Rossino JCS Fernandes W. W. Bose Filho
Groups CSSE
Journal JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Year 2018
Month April
Volume 27
Number 4
Pages 1917-1926
Abstract 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.
DOI http://dx.doi.org/10.1007/s11665-018-3244-7
ISBN
Publisher
Book Title
ISSN 1059-9495
EISSN 1544-1024
Conference Name
Bibtex ID ISI:000429000000043
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