Abstract
The effect of SiC volume fraction and particle size on the fatigue behavior of 2080 Al was investigated. Matrix microstructure in the composite and the unreinforced alloy was held relatively constant by the introduction of a deformation stage prior to aging. It was found that increasing volume fraction and decreasing particle size resulted in an increase in fatigue resistance. Mechanisms responsible for this behavior are described in terms of load transfer from the matrix to the high stiffness reinforcement, increasing obstacles for dislocation motion in the form of S’ precipitates, and the decrease in strain localization with decreasing reinforcement interparticle spacing as a result of reduced particle size. Microplasticity was also observed in the composite, in the form of stress-strain hysteresis loops, and is related to stress concentrations at the poles of the reinforcement. Finally, intermetallic inclusions in the matrix acted as fatigue crack initiation sites. The effect of inclusion size and location on fatigue life of the composites is discussed.
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Chawla, N., Jones, J.W., Andres, C. et al. Effect of SiC volume fraction and particle size on the fatigue resistance of a 2080 Al/SiC p composite. Metall Mater Trans A 29, 2843–2854 (1998). https://doi.org/10.1007/s11661-998-0325-5
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DOI: https://doi.org/10.1007/s11661-998-0325-5