High temperature mechanical properties of SIC whisker reinforced Al₂O₃ composites
by A.R. DeArellano-Lopez, A. Dominguez-Rodriguez, K.C. Goretta, J.L. Routbort
International Journal of Materials and Product Technology (IJMPT), Vol. 8, No. 2/3/4, 1993

Abstract: High-temperature constant load and constant strain rate compressive tests have been performed on Al₂O₃ reinforced with different concentrations of SIC whiskers. The samples were obtained from three sources, but contained whiskers from the same source. The temperature range was from 1300 to 1500°C and experiments were conducted in air and argon. Strain rates varied from 3x10⁻⁸ to 5x10⁻⁵ s⁻¹ with stresses between 3 and 500 MPa. Stress exponents were found to vary between 1 and 5 and depended on microstructure, whisker concentration and stress, indicating a change in the mechanism controlling plastic deformation. Change from diffusional creep to a damage accumulation mechanism was supported by TEM observations on samples as-received and deformed both in the n=l regime and in the n=5 regime. Degradation of Sic whiskers occurred when testing in air.

Online publication date: Thu, 04-Nov-2010

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