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High‐Temperature Stress Corrosion Cracking in Ceramics
Author(s) -
CAO HENG C.,
DALGLEISH BRIAN J.,
HSUEH CHUNHWAY,
EVANS ANTHONY G.
Publication year - 1987
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.1151-2916.1987.tb04978.x
Subject(s) - materials science , environmental stress cracking , corrosion , stress corrosion cracking , composite material , cracking , wetting , fracture mechanics , stress (linguistics) , crack closure , metallurgy , ceramic , grain boundary , amorphous solid , stress intensity factor , stress concentration , microstructure , crystallography , chemistry , linguistics , philosophy
Single‐phase ceramics are shown to be susceptible to stress corrosion cracking at elevated temperatures in the presence of a wetting amorphous deposit. Crack arrest occurs when the crack is depleted of amorphous material, provided that the stress intensity is below a “blunting” threshold. A preliminary model of such cracking has been developed. The model considers stress corrosion as a process wherein the corrosive medium, by virtue of its wetting characteristics, allows the crack to propagate along grain boundaries. A crack velocity that depends sensitively on the dihedral angle is predicted. Furthermore, since the corrosive medium acts as a conduit for rapid atom transport to the crack tip, the crack velocity also exhibits a strong dependence on the viscosity of the fluid medium. Implications for such stress corrosion processes on premature failure are discussed.