4 edition of Stress-induced phase transformation in ZrO2 materials found in the catalog.
Stress-induced phase transformation in ZrO2 materials
by National Library of Canada = Bibliothèque nationale du Canada in Ottawa
Written in English
|Series||Canadian theses = Thèses canadiennes|
|The Physical Object|
|Pagination||2 microfiches : negative.|
ZrO2 crystallizes in the tetragonal P4_2/nmc space group. The structure is three-dimensional. Zr4+ is bonded in a distorted body-centered cubic geometry to eight equivalent O2- atoms. There are four shorter ( Å) and four longer ( Å) Zr–O bond lengths. O2- is bonded to four equivalent Zr4+ atoms to form a mixture of distorted edge and corner-sharing OZr4 tetrahedra. The stress-induced tetragonal-to-monoclinic phase transformation in pure and doped zirconia was studied by site-specific electron diffraction and micro Raman spectroscopy on the single particle level.
Co-precipitation methods have been used to produce 20 mol% Al2O3–80 mol% ZrO2 mixed oxides, from aqueous solutions of zirconium oxychloride and aluminium chloride, followed by precipitation with ammonia. The resulting gel was calcined at increasing temperatures, and X-ray diffraction confirmed that the structure remained amorphous up to °C and then crystallized as a single-phase . Hunter Rauch will present "Phase Transformations in Additively Manufactured Materials" May Al-ZrO2 Fabricated by Additive Friction Stir Deposition Hang Yu presented "In Situ Investigation of Stress-induced Martensitic Transformation in Granular Shape Memory Ceramics".
AbstractCurrent knowledge of toughening mechanisms in zirconia ceramics is reviewed, with particular emphasis on the transformation toughening of yttria-stabilised polycrystalline tetragonal zirconia (Y-TZP). The physics and mechanics of transformation toughening are discussed, but the main aim is to provide a comprehensive understanding of the role of the metastable tetragonal zirconia phase. In situ investigation of stress-induced martensitic transformation in granular shape memory ceramic packings View/ Open (Mb).
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J. Mach. Phys. Solids Vol. 41, No. 9, pp./93 $+ Printed in Great Britain. CC Pergamon Press Ltd ON THE MECHANICS OF STRESS-INDUCED PHASE TRANSFORMATION IN ZIRCONIA BERNARD BUDIANSKY and LEV TRUSKINOVSKY+ Division of Applied Sciences, Harvard University, Cambridge, MAU.S.A.
; and + Department Cited by: Cheryl S. Lim, Trevor R. Finlayson, Fred Ninio, John R. Griffiths, In‐Situ Measurement of the Stress‐Induced Phase Transformations in Magnesia‐Partially‐Stabilized Zirconia Using Raman Spectroscopy, Journal of the American Ceramic Society, /jtbx, 75, 6, (), ().
The novel stress-induced transformation characteristics of YNbO 4-modified ZrO 2 (3Y) ceramics were investigated using an in situ compression–diffraction technique employing synchrotron radiation.
The observed stress-induced phase transformation of cubic-to-tetragonal and/or cubic-to-orthorhombic plays the primary role on energy-absorbing mechanism in the present material system.
In this paper, we present full-field measurements of the strain during stress-induced martensitic phase transformations of thin sheets of Nitinol subjected to uniaxial tension.
These measurements were obtained by digital image correlation (DIC), an in situ optical method that measures displacement on the surface of an object by tracking and Cited by: Other articles where Transformation toughening is discussed: advanced structural ceramics: Transformation toughening: The most promising toughening mechanism for ceramic materials involves a phase transformation; the method is referred to as transformation toughening and is illustrated in Figure 1.
Although other materials such as alumina can be transformation-toughened, zirconia. Stress-induced phase transformation in ZrO2 materials book Several researchers1,2,3,4,5,6,7,8 have demonstrated, through experiments and analysis, that the structure and properties of nanometre-scale materials can Cited by: About this book.
For all kinds of materials, phase transformations show common phenomena and mechanisms, and often turn a material, for example metals, multiphase alloys, ceramics or composites, into its technological useful form.
The physics and thermodynamics of a transformation from the solid to liquid state or from one crystal form to.
However, a comparison of microstructure and transformation behavior of te- tragonal ZrO2-containing ceramics () with that of the pre- sent BNw-rich material suggests that a stress-induced phase transformation is responsible for the toughening.
BNw # q. %q.4 I "- p, 1 bar, T ~ BNg BNzb p. lOOkbar. T FIG. A.A. Sobol and Yu.K. Voronko, Stress-induced cubic–tetragonal transformation in partially stabilized ZrO2: Raman spectroscopy study, Journal of Physics and Chemistry of Solids, 65, 6, (), ().
containing the metastable phase undergoes stress-induced phase transformation by the absorption of thermal or mechanical stress and exhibits strengths in excess of MPa ( ksi). Introduction Zirconium dioxide, ZrO2 (zirconia), undergoes a displacive (martensitic) transformation on cooling.
transformations that involve only minor displacive strains are of little use because they will show a limited ability to be stress-induced. So the two unique features of martensite transformation, high speed and a change of shape of transformed volume are both essential, if transformation.
The phase stability and microstructure evolution of zirconia nanofilms on Si substrates prepared by ion beam assisted deposition (IBAD) upon thermal annealing and intensive radiation have been studied by in situ transmission electron microscopy (TEM), ex situ X-ray diffraction, and Raman spectroscopy.
For as-prepared amorphous-dominant ZrO2 thin films, a phase transformation sequence of. Nadin Al-Haj Husain, Josette Camilleri, Mutlu Özcan, Effect of polishing instruments and polishing regimens on surface topography and phase transformation of monolithic zirconia: An evaluation with XPS and XRD analysis, Journal of the Mechanical Behavior of Biomedical Materials, /, 64, (), ().
After calibration of the selected diffraction pattern, we found that the “intragranular” ZrO2 in ZTA-1 is a tetragonal phase, while the ZrO2 in ZTA-2 is a monoclinic phase. It is well known that ZrO2 exists in monoclinic phase at room temperature.
When the matrix has sufficient compressive stress on the ZrO2 particles and the particle size. The stress-induced martensitic phase transformation from a tetragonal (t) phase to a monoclinic (m) phase in a CeO 2 doped tetragonal polycrystal (Ce-TZP) was investigated from the view pints of characters of lattice correspondences (LCs) between tand m-phases and morphology of m-phase.
Electron back scattering diffraction (EBSD) analysis in the vicinity of Vickers indentations in Ce-TZP.
In recent years, Hf/ZrO2-based thin films have emerged as promising candidates for ferroelectric materials in various applications. However, achieving ferroelectricity with a low-temperature process has remained a challenging task. In this study, the atomic layer plasma treatment (ALPT) technique, where an i Journal of Materials Chemistry C HOT Papers.
It should also be useful for researchers working in industrial materials laboratories. The book is effectively in two parts: chapters contain the background material necessary for understanding phase transformations: thermodynamics, kinetics, diffusion theory Reviews: JACerS is a leading source for top-quality basic science research and modeling spanning the diverse field of ceramic and glass materials science.
An X‐ray diffraction technique was used to measure the residual surface stresses on ground surfaces of Al2O3/ZrO2 (tetragonal) composites. The high fracture toughness exhibited by many of zirconia ceramics is attributed to the constraint of the tetragonal‐to‐monoclinic phase transformation and its release during crack propagation.
In other zirconia ceramics containing the tetragonal phase, the high fracture toughness is associated with ferroelastic domain switching. Sheng-Dih Yuh, Chen-Chia Chou, Peculiar stress-induced phase transformation in YNbO4-modified ZrO2(3Y) using in situ compression–diffraction, Materials Letters, /SX(01), 52,(), ().
The images reveal concentrations of the monoclinic phase at grain boundaries. Regions surrounding indents in the tile created with a Vickers hardness tester, were also mapped to reveal the extent and pattern of stress-induced phase transformation. A Raman map was also generated from an area before and after indentation.During grinding, the stress-induced transformation from the tetragonal to the monoclinic phase of ZrO2 particles ensures a high strength in combination with a high fracture toughness even after.Phase Transformation and Physical Properties.
In zirconia, the stress-induced phase transformation from the metastable tetragonal phase to the monoclinic phase at ambient temperatures results in a % volume expansion and approximately 7% shear strain (De Aza et al., ).The induced volume change and strain oppose crack propagation, thereby improving the fracture toughness of the.