Effect of salt-water fog on fatigue crack nucleation of Al and Al-Li alloys

Materials Research

O. C. Gamboni¹  J. A. Moreto¹  L. H. C. Bonazzi¹  C. O. F. T. Ruchert¹  W. W. Bose Filho¹ 

[1] ,University of São Paulo Department of Materials Engineering São Carlos SP ,Brazil

关键词: Al-Li alloys;    AA2198-T851;    AA2524-T3 corrosion fatigue;    S-N curves;    saline environment;   

DOI  :  10.1590/S1516-14392013005000190

来源: SciELO

【 摘 要 】

Fatigue and corrosion-fatigue tests were performed to quantify the fatigue properties of AA2524-T3 and AA2198-T851 Al alloys. High cycle axial fatigue tests were carried out under air and salt-water fog conditions. In air, the specimens were fatigue tested at a frequency of 50 Hz, using specimens with and without preconditioning in a salt spray chamber, and for the corrosion fatigue condition, the tests took place at a frequency of 30 Hz in a salt-water fog condition. In all cases it was used a sinusoidal waveform and a stress ratio (R) of 0.1. The results indicate that the saline environment had a deleterious effect on the fatigue life of the two aluminum alloys. AA2524-T3 exhibited a better fatigue strength than AA2198-T851 when fatigue tested in air. However, considering the corrosion fatigue test in a saline fog environment an inverse behavior was observed with the AA2198-T851 exhibiting higher fatigue strength.

【 授权许可】

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