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Crack‐Tip Transformation Zones in Toughened Zirconia
Author(s) -
Marshall David B.,
Shaw Michael C.,
Dauskardt Reinhold H.,
Ritchie Robert O.,
Readey Michael J.,
Heuer Arthur H.
Publication year - 1990
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.1151-2916.1990.tb06743.x
Subject(s) - materials science , microprobe , cubic zirconia , composite material , fracture toughness , raman spectroscopy , volume fraction , stress intensity factor , fracture (geology) , ceramic , fracture mechanics , mineralogy , optics , geology , physics
Transformation zones surrounding cracks in several toughened magnesia‐partially‐stabilized zirconia ceramics are characterized by optical interference measurements of surface uplift and by Raman microprobe spectroscopy. The measurements demonstrate that the volume fraction of transformation is nonuniform within the zone and that the extent of the frontal zone is approximately the same as that of the wake. Results are used to evaluate the crack‐tip shielding stress intensity factor and to compare with the measured fracture toughness.