Abstract
Two types of α-alumina, D975 and D997, were tested under compression in air and in physiological media and the acoustic emission data recorded for each test. The typical pulse width and amplitude distributions in these tests are discussed. The scanning electron microscopy examinations showed that twinning features were encountered more frequently in the less pure material, D975, which showed a transgranular mode of fracture, while the high purity alumina had intergranular fracture surfaces. A slow rate acoustic emission, 10 to 30 events per minute, gave early warning signals of failure at about 50% failure stress, σ f, and catastrophic failure started at above 87% σ f. The decreased strength values are related to the surface interactions with the electrolytes in the physiological media.
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Nash, A. Compressive failure modes of alumina in air and physiological media. J Mater Sci 18, 3571–3577 (1983). https://doi.org/10.1007/BF00540729
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DOI: https://doi.org/10.1007/BF00540729