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Crack Growth Resistance of Textured Alumina
Author(s) -
Salem Janathan A.,
Shan John L.,
Brad Richard C.
Publication year - 1989
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.1151-2916.1989.tb05947.x
Subject(s) - crystallite , materials science , composite material , isotropy , resistive touchscreen , mineralogy , crystallography , metallurgy , chemistry , optics , physics , electrical engineering , engineering
The crack growth resistance of a textured, extruded alumina body was compared with that of an isotropic, isopressed body of similar grain size, density, and chemistry. R ‐curve levels reflected the preferred orientation; however, R ‐curve slopes ( dK IR / d Δ a ) were the same in all instances, implying a similar crack growth resistive mechanism. Three orthongonal orientations of crack growth in the two structures exhibited similar forms of K IR versus Δ a curves, for which a schematic diagram for polycrystalline ceramics is proposed.