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Stress Corrosion Cracking of Single‐Crystal Tetragonal ZrO 2 (Er 2 O 3 )
Author(s) -
Ridruejo Alvaro,
Pastor José Y.,
LLorca Javier,
Sayir A.,
Orera V. M.
Publication year - 2005
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.1551-2916.2005.00573.x
Subject(s) - tetragonal crystal system , materials science , monoclinic crystal system , raman spectroscopy , scanning electron microscope , composite material , cracking , residual stress , stress corrosion cracking , phase (matter) , fracture (geology) , residual strength , corrosion , crystal structure , crystallography , optics , chemistry , physics , organic chemistry
The flexure strength of partially‐stabilized tetragonal ZrO 2 (Er 2 O 3 ) single‐crystal monofilaments manufactured by the laser‐heated floating zone method was measured as a function of the environment (air versus water) and temperature (from 25° to 800°C) at loading rates spanning three orders of magnitude to ascertain their susceptibility to the environmental conditions. These mechanical tests were completed with parallel tests on fully annealed monofilaments (to relieve the thermal residual stresses induced during growth) and by detailed analysis of the fracture surfaces using scanning electron microscopy and micro‐Raman spectroscopy. While environmental susceptibility of ZrO 2 (Y 2 O 3 ) in previous investigations was always associated with the destabilization of the tetragonal phase, monoclinic phase was not detected on the fracture surfaces of the ZrO 2 (Er 2 O 3 ) monofilaments and it was concluded that slow crack growth in this material at high temperature or immersed in water was due to stress corrosion cracking.