Abstract
Slow crack growth at elevated temperatures is studied in one experimental and two commercial LAS glass ceramics. All show intergranular crack growth with the crack also passing along the interfaces of precipitates even when these are needle-shaped. The commercial materials differ from the experimental in that the shape of the cracks in them indicates an environmental effect absent in the experimental material. In one of the commercial materials, lifetimes as a function of initial stress-intensity factors are determined. Lifetimes are found to increase as the testing temperature is reduced and as the material is heat treated.
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Northover, J.P., Groves, G.W. High-temperature mechanical properties of Li2O-Al2O3-SiO2 (LAS) glass ceramics. J Mater Sci 16, 1881–1886 (1981). https://doi.org/10.1007/BF00540636
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DOI: https://doi.org/10.1007/BF00540636