Significance of Internal Stresses for the Martensitic Transformation in Yttria‐Stabilized Tetragonal Zirconia Polycrystals During Degradation

Schmauder, Siegfried; Schubert, H.

doi:10.1111/j.1151-2916.1986.tb04789.x

Cited by 162 publications

(76 citation statements)

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“…Development of such microstresses is critically dependent upon the elastic and plastic anisotropy intrinsic to the material because variations in the degree of elasto-plastic anisotropy strongly influence the magnitude of microstress [43]. The inter-/intra-granular microstresses are of critical importance in failure mechanisms of the ceramics, such as ratio of the trans-and inter-granular fracture, crack branching or bridging [44], microcracking [45,46], stress-induced phase transformation [47,48], subcritical crack growth [49], fatigue [50], etc. These microstresses govern crack-propagation induced energy dissipation [51,52] and affect the ceramic toughness and strength.…”

Section: Residual Stresses In Zr(hf)b 2 -Sic Compositesmentioning

confidence: 99%

Vibrational Properties of Zr(Hf)B2–SiC UHTC Composites by Micro-Raman Spectroscopy

Donohue

Carpenter

Orlovskaya

2010

NATO Science for Peace and Security Series B: Physics and Biophysics

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Section: Residual Stresses In Zr(hf)b 2 -Sic Compositesmentioning

confidence: 99%

Vibrational Properties of Zr(Hf)B2–SiC UHTC Composites by Micro-Raman Spectroscopy

Donohue

Carpenter

Orlovskaya

2010

NATO Science for Peace and Security Series B: Physics and Biophysics

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“…The presence of stress singularities at grain edges has been confirmed by numerical and ana lytical means (8)(9)(10). Neither the preferred nucleation site at facetted interfaces nor the shape and the growth direction of the nucleus have been addressed theoretically in the frame of heterogeneous nucleation theory until now.…”

mentioning

confidence: 71%

Nucleation of the Martensitic Transformation of ZrO₂in the System Al₂O₃-ZrO₂

Schmauder¹

1989

ESOMAT 1989 - Ist European Symposium on Martensitic Transformations in Science and Technology

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The nucleation of the martensitic transformation of Zr0 2 from the tetragonal (t) to the monoclinic (m) symmetry is utilized to increase the toughness of ZrO2-toughened Al2O 1 (ZTA), polycrystalline Y2O3-stabilized tetragonal ZrO2 (Y-TZP) and other ceramics. This pheno menon is caused by a volume increase of the transforming particles of about 4.7% which opposes the opening of cracks and reduces the crack tip stresses.In this paper, attention is focussed to the system ZTA where spherical and ellipsoidal ZrO2-inclusions are embedded in Al2O3-grains while facetted ZrO2-particles are located between Al2O.i-ttrains (1). In contrast to bulk ZrO2 with a martensite start temperature of M,"950°C, the transformation is suppressed by the constraint of the surrounding Al2Or matrix in ZTA even at room temperature (RT). It is of great technological importance to con trol the M s -temperature simply by changing the size of the ZrO2-particles. The critical ZrO2-grain size dc is defined as that particle size where the transformation occurs at RT: dc »d(M l = RT) (2). A maximum toughness increase is obtained keeping the size of ZrO2-partides slightly below d c (d^O.6 //m -O.8 µm for ZTA (3)) in order to benefit from the trans formation of a maximum number of grains. It has been realized that the incorporation of 15 vol.% of facetted ZrO2-particles into Al2O 3 leads to optimum toughness values (4). This is mainly attributed to the interaction of the particles in case of denser populations und to the fact that regularly shaped ellipsoidal particles of a size already critical for facetted grains are lacking in defects. The latter, however, is a second prerequisite to start the martensitic trans formation.Therefore, the main driving force for the nucleation of the martensitic transformation was soon identified with the thermal stresses in the system ZTA together with geometrical irregu larities such as facetted phase boundaries. The martensitic t-m transformation is thus be lieved to nucleate heterogeneously at corners and edges of the ZrO2-particles which are other wise defect free and that shear components of the cigenstresses play a prominent role for the transformation (S). The results from the homogeneous nucleation theory suggest an oblate spheroidal shape of the nucleus (6) with a large volume of 30*30*5 nnv in Y-TZP and an experimentally observed growth direction of m-Zr0 2 from the grain boundary into the grain in Y-TZP (7).The presence of stress singularities at grain edges has been confirmed by numerical and ana lytical means (8-10). Neither the preferred nucleation site at facetted interfaces nor the shape and the growth direction of the nucleus have been addressed theoretically in the frame of heterogeneous nucleation theory until now. However, this is necessary to understand the lack of experimental observations in the transmission electron microscope (TEM) with respect to nucleation strain precursors in the system ZTA. Particle Shape and Elastic FieldsIn this section literature data and own results are reported in ord...

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“…Moreover, while some grains undergo transformation at room temperature, others require an increased temperature for this process mainly due to their smaller size [10,11].…”

Section: Zirconia and Transformation Changementioning

confidence: 99%

Adhesion to Zirconium Dioxide Used for Dental Reconstructions: Surface Conditioning Concepts, Challenges, and Future Prospects

Özcan

Volpato

2015

Curr Oral Health Rep

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Yttrium-stabilized zirconium dioxide, a commonly used material in conjunction with CAD/CAM technologies in dentistry, is an oxide ceramic that does not comprise silicon dioxide (SiO 2 ) phase in its microstructure. Since it is challenging to create durable adhesion between resin cements and this kind of nonetchable ceramic, efforts have been made to develop innovative surface conditioning methods over the years.While some chemical methods based on using adhesion promoters only did not perform stable adhesion, others utilizing physico-chemical conditioning methods provided better adhesion where the latter is also being questioned on impairing mechanical stability of zirconium dioxide (ZrO 2 ) due to t→m phase transformation.This review will highlight current surface conditioning concepts to achieve best adhesion to zirconium dioxide, challenges related to conditioning methods or resin-based luting cements, and contemplate on future prospects.

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Significance of Internal Stresses for the Martensitic Transformation in Yttria‐Stabilized Tetragonal Zirconia Polycrystals During Degradation

Cited by 162 publications

References 15 publications

Vibrational Properties of Zr(Hf)B2–SiC UHTC Composites by Micro-Raman Spectroscopy

Vibrational Properties of Zr(Hf)B2–SiC UHTC Composites by Micro-Raman Spectroscopy

Nucleation of the Martensitic Transformation of ZrO₂in the System Al₂O₃-ZrO₂

Adhesion to Zirconium Dioxide Used for Dental Reconstructions: Surface Conditioning Concepts, Challenges, and Future Prospects

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Significance of Internal Stresses for the Martensitic Transformation in Yttria‐Stabilized Tetragonal Zirconia Polycrystals During Degradation

Cited by 162 publications

References 15 publications

Vibrational Properties of Zr(Hf)B2–SiC UHTC Composites by Micro-Raman Spectroscopy

Vibrational Properties of Zr(Hf)B2–SiC UHTC Composites by Micro-Raman Spectroscopy

Nucleation of the Martensitic Transformation of ZrO2in the System Al2O3-ZrO2

Adhesion to Zirconium Dioxide Used for Dental Reconstructions: Surface Conditioning Concepts, Challenges, and Future Prospects

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Nucleation of the Martensitic Transformation of ZrO₂in the System Al₂O₃-ZrO₂