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Fracture Induced in Al 2 O 3 Bicrystals by Anisotropic Thermal Expansion
Author(s) -
MAR HENRY Y. B.,
SCOTT WILLIAM D.
Publication year - 1970
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1970.tb15965.x
Subject(s) - thermal expansion , anisotropy , materials science , grain boundary , residual stress , fracture (geology) , stress (linguistics) , perpendicular , condensed matter physics , composite material , thermal , ultimate tensile strength , boundary (topology) , geometry , thermodynamics , microstructure , optics , physics , mathematics , mathematical analysis , linguistics , philosophy
Bicrystals of Al 2 O 3 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 −60 C −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.