The residual stresses within a deformation band in a ceria-stabilized tetragonal zirconia/alumina (Ce-TZP/Al2O3) ceramic composite are measured by piezo-spectroscopy, in the zirconia phases from their Raman spectra and in the alumina phase from its Cr3+ fluorescence. The concentrations of monoclinic zirconia across the deformation band are obtained from Raman spectra recorded from locations across the band. These measurements show that the deformation bands are associated with a localization of the tetragonal-to-monoclinic transformation and that although the overall residual stress in the bands is compressive, the tensile stress in the tetragonal zirconia phase is enhanced. The experimental data are compared with the predictions of a stochastic theory for three-phase materials and with models for the stress distribution within a deformation band. The region ahead of the deformation band is subject to an additional, superimposed tensile stress whose magnitude compares favorably with the predictions of a superdislocation model presented.

Deformation bands in ceria-stabilized tetragonal zirconia/alumina: I, measurement of internal stresses

SERGO, VALTER;
1995-01-01

Abstract

The residual stresses within a deformation band in a ceria-stabilized tetragonal zirconia/alumina (Ce-TZP/Al2O3) ceramic composite are measured by piezo-spectroscopy, in the zirconia phases from their Raman spectra and in the alumina phase from its Cr3+ fluorescence. The concentrations of monoclinic zirconia across the deformation band are obtained from Raman spectra recorded from locations across the band. These measurements show that the deformation bands are associated with a localization of the tetragonal-to-monoclinic transformation and that although the overall residual stress in the bands is compressive, the tensile stress in the tetragonal zirconia phase is enhanced. The experimental data are compared with the predictions of a stochastic theory for three-phase materials and with models for the stress distribution within a deformation band. The region ahead of the deformation band is subject to an additional, superimposed tensile stress whose magnitude compares favorably with the predictions of a superdislocation model presented.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2546817
 Avviso

Registrazione in corso di verifica.
La registrazione di questo prodotto non è ancora stata validata in ArTS.

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 67
  • ???jsp.display-item.citation.isi??? 62
social impact