Abstract
The present study investigates the fatigue-crack propagation resistance of an FeAl-based alloy, with a special emphasis placed on the analysis of the mechanisms involved in environmentally assisted crack growth. To this end, a series of tests have been conducted at room temperature in air, in high and low vacuum, and in argon. The results reveal a significant fatigue-crack growth (FCG) enhancement when the material is fatigued in a moist environment. This enhancement may, however, be inhibited by oxygen in the case of a low water-vapor partial pressure. Besides, the analysis of the results obtained under various exposure conditions suggests that the FCG enhancement in air is mostly controlled by water-vapor adsorption, which reduces the energy required to create a unit cracked area. Examination of dislocation structures within the plastic zone reveals a lower extent of plasticity in air, consistent with this mechanism. Predictions obtained by a model of adsorption-assisted propagation provide an additional support for the adsorption assumption. Finally, an FCG growth law is proposed to describe the intrinsic resistance as observed in inert environments and to account for the mechanism operative in fatigue-crack propagation in ambient air.
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Tonneau, A., Gerland, M. & Hénaff, G. Environment-sensitive fracture of iron aluminides during cyclic crack growth. Metall Mater Trans A 32, 2345–2356 (2001). https://doi.org/10.1007/s11661-001-0208-5
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DOI: https://doi.org/10.1007/s11661-001-0208-5