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Abstract
An Al-Cu-Mg alloy has been fatigued in various environments at high (20 kHz) and low (96 Hz) frequency. A frequency effect was observed and is discussed in relation to the influence of environment and the inhibition of the nucleation and early crack-growth mechanisms at high frequency. Metallographic and fracto graphic examination of the high- and low- frequency specimens revealed similar fatigue features, except that at high frequency the ripple spacing tended to be smaller, persistent slip-bands were more localized and, in certain environments, multiple cracking occurred.