Abstract
The micromechanisms and characteristics of fatigue crack-growth in Si3N4 ceramic microstructures are reviewed. The potent toughening derived from weak grain/matrix interfaces and elongated β-Si3N4 grains is discussed in the context of enhanced crack wake bridging and microcracking phenomena. Under cyclic loads, the wear degradation of frictional grain bridges is modeled to provide quantitative predictions of fatigue crack-growth behavior. Next, the effect of crystallization of grain boundary phases employed to enhance high temperature mechanical strength and creep resistance in Si3N4 microstructures, is found to leave ambient temperature fracture and fatigue crack-growth properties intact. Finally, the effect of elevated temperatures (T < 1000°C) on the micromechanisms of fatigue and corresponding crack-growth rates are discussed and compared to experimentally measured behavior.
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© 1994 Springer Science+Business Media Dordrecht
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Dauskardt, R.H. (1994). Cyclic Fatigue-Crack Growth in Si3N4-Ceramics. In: Hoffmann, M.J., Petzow, G. (eds) Tailoring of Mechanical Properties of Si3N4 Ceramics. NATO ASI Series, vol 276. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0992-5_26
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DOI: https://doi.org/10.1007/978-94-011-0992-5_26
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