Fracture Induced in Al2O3 Bicrystals by Anisotropic Thermal Expansion |
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| Authors: | HENRY Y. B. MAR WILLIAM D. SCOTT |
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| Affiliation: | Department of Mining, Metallurgical, and Ceramic Engineering, University of Washington, Seattle, Washington 98105 |
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| Abstract: | Bicrystals of Al2O3 were fabricated to study the effects of thermal expansion anisotropy on fracture in a model system containing one grain boundary. Fractures occurred perpendicular to the directions of maximum tensile stress in bicrystals with thermal expansion coefficient differences as low as 0.31×10−60C−1 and originated at the boundary, probably in areas of high residual stress associated with pores. Numerical stress analysis of two-dimensional model bicrystal configurations showed that stresses induced by thermal expansion anisotropy are maximal in a region localized along the bicrystal boundary. |
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