scholarly journals Fracture toughness enhancement of yttria-stabilized tetragonal zirconia polycrystalline ceramics through magnesia-partially stabilized zirconia addition

2020 ◽  
Vol 5 (4) ◽  
pp. 527-534 ◽  
Author(s):  
Bilal Soylemez ◽  
Ercan Sener ◽  
Arife Yurdakul ◽  
Hilmi Yurdakul
Keyword(s):  
Fracture Toughness ◽  
Tetragonal Zirconia ◽  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia ◽  
Polycrystalline Ceramics ◽  
Toughness Enhancement ◽  
Zirconia Addition

Simple Notch Preparation Technique for Fracture Toughness Measurements in Partially Stabilized Zirconia

1993 ◽  
Vol 76 (3) ◽  
pp. 785-787 ◽  
Author(s):  
V. E. Annamalai ◽  
R. Ponraj ◽  
S. Ramakrishna Iyer ◽  
C. V. Gokularathnam ◽  
R. Krishnamurthy
Keyword(s):  
Fracture Toughness ◽  
Preparation Technique ◽  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia

Surface Damage of Yttria-Tetragonal Zirconia Polycrystals and Magnesia-Partially-Stabilized Zirconia in Single-Point Abrasion

1995 ◽  
Vol 78 (12) ◽  
pp. 3357-3362 ◽  
Author(s):  
S. A. Syed Asif ◽  
D. Victor Suvisesha Muthu ◽  
Ajay Kumar Sood ◽  
Sanjay Kumar Biswas
Keyword(s):  
Single Point ◽  
Tetragonal Zirconia ◽  
Surface Damage ◽  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia

Terahertz-induced martensitic transformation in partially stabilized zirconia

2021 ◽  
Author(s):  
Masaya Nagai ◽  
Yuhei Higashitani ◽  
Masaaki Ashida ◽  
Koichi Kusakabe ◽  
Hirohiko Niioka ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Shear Deformation ◽  
Tetragonal Zirconia ◽  
Thermal Quenching ◽  
Stabilized Zirconia ◽  
Phonon Modes ◽  
Partially Stabilized Zirconia ◽  
Terahertz Pulses ◽  
Transformation Mechanisms ◽  
Local Shear

Abstract Martensitic crystal structures are usually obtained by rapid thermal quenching of certain alloys, which induces stress and subsequent shear deformation. Here, we demonstrate that it is also possible to intentionally excite a suitable transverse acoustic phonon mode to induce a local shear deformation. We irradiate the surface of a partially stabilized zirconia plate with intense terahertz pulses and verify martensitic transformation from the tetragonal to the monoclinic phases by Raman spectroscopy and the observed destructive spallation of the zirconia microcrystals. We calculate the phonon modes in tetragonal zirconia and determine the effective channel that triggers the transformation. This mode can be excited via the Klemens process. Since terahertz pulses can induce a specific local shear deformation beyond thermal equilibrium, they can be used to elucidate phase transformation mechanisms with dynamical approaches. Terahertz-induced martensitic transformation is considered to be useful for material strengthening and shape memory ceramics.

Pitfalls of local and quantitative phase analysis in partially stabilized zirconia

2012 ◽  
Vol 45 (6) ◽  
pp. 1136-1144 ◽  
Author(s):  
Stefan Martin ◽  
Harry Berek ◽  
Christos G. Aneziris ◽  
Ulrich Martin ◽  
David Rafaja
Keyword(s):  
Phase Transformation ◽  
Phase Analysis ◽  
Tetragonal Zirconia ◽  
Quantitative Phase Analysis ◽  
Local Concentration ◽  
Stabilized Zirconia ◽  
Concentration Gradients ◽  
Continuous Transition ◽  
Partially Stabilized Zirconia ◽  
Quantitative Phase

The addition of selected elements into the host structure of ZrO2stabilizes the tetragonal and cubic phases of zirconia, which are, in their undoped binary form, only stable at high temperatures. From the crystallographic point of view, the increasing amount of the stabilizer causes a continuous transition of the tetragonal zirconia to its cubic modification. In partially stabilized zirconia, local concentration gradients of the stabilizer are frequently present as a consequence of the production process, which results in a coexistence of zirconia domains having different degrees of tetragonality. The presence of the local concentration gradients in such samples and the continuous nature of the phase transformation are features important for many technological applications, but their analysis is not straightforward. Furthermore, these features complicate the quantitative phase analysis in partially stabilized zirconia. For the example of zirconia partially stabilized by magnesium, this contribution illustrates the capabilities and limitations of X-ray and electron backscatter diffraction. In particular, the ability of these experimental methods to reveal the gradual lattice distortion that is associated with the cubic to tetragonal phase transformation in zirconia and the reliability of the quantitative phase analysis are discussed. In this context, it is shown to what extent the choice of the microstructure model influences the result of the phase analysis.

scholarly journals Crack Configuration Beneath Vickers Indentation and Fracture Toughness Evaluation in Y2O3-Partially Stabilized Zirconia

1986 ◽  
Vol 94 (1094) ◽  
pp. 1049-1055 ◽  
Author(s):  
Masahiro ASHIZUKA ◽  
Hideki KIYOHARA ◽  
Eiichi ISHIDA ◽  
Makoto KUWABARA ◽  
Yoshitaka KUBOTA ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Vickers Indentation ◽  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia ◽  
Crack Configuration ◽  
Toughness Evaluation ◽  
Fracture Toughness Evaluation

Displacive Phase Transformations in Zirconia-Based Ceramics

1986 ◽  
Vol 78 ◽  
Author(s):  
B. C. Muddle
Keyword(s):  
Habit Plane ◽  
Orientation Relationship ◽  
Tetragonal Zirconia ◽  
Formal Theory ◽  
Orthorhombic Phase ◽  
Thin Foil ◽  
Intermediate Stage ◽  
Transformation Toughening ◽  
Stabilized Zirconia ◽  
Partially Stabilized Zirconia

ABSTRACTA review is presented of experimental observations of the mechanism and crystallography of the martensitic tetragonal to monoclinic transformation occurring both in dispersed tetragonal ZrO2 particles in partially stabilized zirconia and in polycrystalline tetragonal zirconia. Preliinary results of determination of the orientation relationship and habit plane for the stress-activated transformation in a CeO2 –stabilized TZP ceramic are reported and compared with predictions of the crystallographic theory for the transformation. This orientation relationship is such that (100)m//(100)t and [001]m//[001]m, and for this variant of the orientation relationship the habit plane is approximately ( 301 )t. These results are in good agreement with theoretical predictions. Progress in the application of the formal theory of martensitic transformations to the transformations in both types of system is examined critically and implications for theories of transformation toughening are discussed.Attention is also given to tetragonal orthorhombic and orthorhombic monoclinic transformations occurring in Zro2 particles in thin foil specimens of partially stabilized zirconia. Formation of a metastable orthorhombic phase appears a possible, but not essential, intermediate stage in the tetragonal to monoclinic transition. However, present evidence strongly suggests that the orthorhombic structure only occurs in those particles experiencing the relaxed matrix constraints typical of thin foil specimens.

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