The Influence of Air Humidity on Fatigue Properties of an AA2524－T34 Aluminum Alloy

Abstract:

Self-aligning four-point bend fatigue tests were conducted to investigate the influence of humid air on the fatigue behavior of an AA2524-T34 Al alloy. Test specimens of the alloy along the rolling direction was cycled at room temperature and frequency of 15 Hz, tension-tension loading(R = 0.1), in 15% relative humidity (RH) and 95% RH up to 107 cycles to failure. The S-N data shows continuous reduction tendency. It was found that with the increase of test relative humidity, the fatigue properties of the alloy is decreased, the fatigue limit in 95% RH was nearly 20% reduction of that in 15% RH, only 67% of its yield strength. Meanwhile, the S-N data is much more scattered than it in lower relative humidity. In 15% and 95% RH, cracks were initiated predominantly at coarse particles but partly at grain boundaries on the surface in 95%RH. SEM results show the characteristics of intergranular fracture in high humidity circumstance.

• Periodical: Advanced Materials Research (Volume 213)
• Pages: 311-314
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.213.311
• Online since: February 2011
• Authors: Tang Li, Jun Lin Tao, Qingyuan Wang
• Keywords: AA2524 Al Alloy, Fatigue Crack Initiation, Fatigue Property, Four Point Bend Fatigue, Relative Humidity (RH)

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