Mechanical behaviour of yttria tetragonal zirconia polycrystalline nanoceramics: dependence on the glassy phase content

Lorenzo-Martín, Cinta; Flores-Vázquez, J.A.; Gómez-Garcı́a, Diego; Muñoz-Bernabé, A.; Domínguez‐Rodríguez, Arturo; XueMing, D.; Gómez-Herrero, Júlio

doi:10.1016/s0955-2219(02)00122-x

Cited by 12 publications

(9 citation statements)

References 21 publications

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“…4͒. Very recently, Lorenzo-Martín et al 28 have reported the same tendency in YTP nanocrystals deformed at 1150°C with grain size around 50 nm, even when a certain amount of a glassy phase is present.…”

Section: Stress Exponents (N) and Activation Energies (Q)mentioning

confidence: 70%

Model of high-temperature plastic deformation of nanocrystalline materials: Application to yttria tetragonal zirconia

et al. 2003

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The possibility of the influence of segregation-induced local electric fields in the bulk diffusion of the species controlling the plastic deformation of nanocrystalline materials has been pointed out. Until now, there is only a model applicable to the case of a monodimensional system. In spite of its simplicity, it predicts a significative influence of a local electric field in creep. Our work develops a different model applicable to three-dimensional systems. It takes as a starting point the diffusional model, and it can be generalized to those systems in which the grain-boundary sliding model accommodated by diffusional processes accurately describes plasticity in the submicron range of grain size. The range of validity, as well as the different behavior of nanocrystalline materials from the submicron ones is discussed. Preliminary results are in good agreement with the published data for yttria tetragonal zirconia ͑YTZP͒ nanocrystalline ceramics.

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Section: Stress Exponents (N) and Activation Energies (Q)mentioning

confidence: 70%

Model of high-temperature plastic deformation of nanocrystalline materials: Application to yttria tetragonal zirconia

et al. 2003

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“…This was considered as truthful as compared to theory such that it mentioned stainless steel density increased when heating rate increased and therefore, promote the increased in samples densities [10]. This also means that samples with more weight percentage of stainless steel exhibits a higher density due to the total accumulated of an increased in densities based on the amount.…”

Section: Relative Densitymentioning

confidence: 85%

Sintered Properties of Stainless Steel-doped Y-TZP Ceramics

2018

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Abstract. Yttria stabalised Tetragonal Zirconia Polycrystalline (Y-TZP) has been extensively renowned for its vast outstanding contribution in medical field such as primary function for implant biomaterial which acts as restoration of damaged body parts. Nonetheless in the past decades, there have been various reported cases that point the failure of hip transplants involving material of zirconia ceramic. This eventually leads to the birth of this research project where it studied the properties effects of Y-TZP as it was added or doped with stainless steel 316 (SS316). In this research project, the parameter of weight percentage for stainless steel 316 (SS316) to be doped with Y-TZP were as follows; 0 wt%, 0.1 wt%, 0.5 wt% and 1 wt%. The outcome of this experiment then were measured and analysed as according to properties of relative density, Vickers hardness and fracture toughness. The experiment was conducted by firstly mixed the Y-TZP and SS316 powders together as according to the weight percentage of SS316 as well as addition of ethanol solution that act for medium of enhancement. The mixture then underwent compacting pressure bench press as well as Cold Isostatic Pressure (CIP) in order to produce the green sample. After that, the green sample underwent sintering process via pressureless sintering method at mentioned ranges temperature of 1250°C, 1300°C, 1400°C and up to 1500°C. Subsequently, the sample then underwent grinding and polishing process before proceeding to the measurement and analysis process. The outcome of the measurement and analysis process revealed that as the content of SS316 doped with Y-TZP increases as well as the increased in sintering temperature, the relative density and fracture toughness profound to be increased while Vickers hardness indicated as decreased.

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“…Este mecanismo de deformación propuesto está de acuerdo con la amplia literatura existente para este material en el rango submicrométrico (7) y con los estudios preliminares ensayados para muestras con tamaño de grano en el rango nanométrico (3,4). Con respecto a la energía de activación, el valor obtenido para nuestro material de estudio (Q ≅ 700kJ/mol), resulta ser muy superior al valor de la energía de activación cuando el sistema acomoda por difusión catiónica en volumen (Q ≅ 500 kJ/mol), mecanismo de acomodación aceptado para las muestras en el rango submicrométrico.…”

Section: Discussionunclassified

“…Con respecto a la energía de activación, el valor obtenido para nuestro material de estudio (Q ≅ 700kJ/mol), resulta ser muy superior al valor de la energía de activación cuando el sistema acomoda por difusión catiónica en volumen (Q ≅ 500 kJ/mol), mecanismo de acomodación aceptado para las muestras en el rango submicrométrico. Aunque este resultado también está de acuerdo con los datos obtenidos en incipientes estudios desarrollados para nuestro material (3,4), no se conocen las causas que hacen aumentar este parámetro, quedando aún por resolver cuál es el mecanismo de acomodación presente.…”

Section: Discussionunclassified

La importancia de la segregación de itrio en la deformación plástica de nanocristales de circonia tetragonal dopada con óxido de itrio (YTZP)

Martin¹,

Lopez²,

Garcia³

et al. 2005

Bol. Soc. Esp. Ceram. Vidr.

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Muestras de YTZP (policristales de oxido de circonio dopado con itria) con tamaño medio de grano de 50 nm, puras y con un 10% en peso de diferentes fases vítreas han sido deformadas a carga constante en un rango de temperatura comprendido entre 1150-1200 ºC. Con dicho estudio se pretende caracterizar el comportamiento mecánico del material y estudiar la influencia de la segregación de itria en la frontera de los granos en los posibles mecanismos de deformación. Igualmente se ha llevado a cabo un estudio microscópico con el fin de obtener una completa caracterización del material. Se han analizado micrografías de las muestras recibidas y de las deformadas a partir de Microscopía Electrónica de Transmisión convencional (TEM), y de las fronteras de granos de dichas muestras por Microscopía Electrónica de Transmisión de Alta Resolución (HRTEM). Se ha probado que la existencia de segregación catiónica hacia las fronteras de granos está relacionada con la falta de una tensión umbral. El parámetro n no se ve alterado por dicha segregación, en buen acuerdo con la ausencia de tensión umbral. . Palabras claves: Nanocerámicos, YTZP, fase vítrea, segregación. Importance of yttrium segregation on plastic deformation of nanocrystalline ytzia doped tetragonel zirconia (YTZP)Nano-sized YTZP (Yttria Tetragonal Zirconia Polycrystals) samples, pure and doped with 10 wt.% of different glassy phases have been crept in a range of temperature between 1150-1200 ºC. Macroscopic characterization of the mechanical behaviour of these material and a study on the effect of the grain boundaries yttria segregation on the mechanical response of these materials have been carried out. Moreover, a microstructural analysis by conventional Transmission Electron Microscopy (TEM) of both, as-received and deformed samples and a study of the grain boundaries by High Resolution Transmission Electron Microscopy are required to have a complete characterization of these materials. The yttrium segregation to grain boundary is related to the non existence of a threshold stress. The parameter n is not altered by this segregation and grain boundary sliding seems to be the deformation mechanism.Key words: Nanoceramics, YTZP, glassy phase, segregation. INTRODUCCIÓNLa ciencia de los nanomateriales es hoy día una de las líneas de investigación de más rápido crecimiento. Dentro de ella, los materiales cerámicos nanoestructurados despiertan un enorme interés, ya que pueden presentar propiedades muy diferentes a los materiales cerámicos convencionales, abriéndose así la posibilidad de diseño de materiales cerámicos con potenciales aplicaciones que los haga competitivos frente a los metales, tal como el "conformado superplástico" y uniones de materiales cerámicos (1). Los materiales cerámicos a base de circonia constituyen la vanguardia en este campo debido a la superplasticidad exhibida en el rango submicrométrico (2). Aunque es escasa la literatura existente para estos materiales cerámicos nanométricos, un primer análisis ha sido el estudio realizado por Gutiérrez Mo...

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Mechanical behaviour of yttria tetragonal zirconia polycrystalline nanoceramics: dependence on the glassy phase content

Cited by 12 publications

References 21 publications

Model of high-temperature plastic deformation of nanocrystalline materials: Application to yttria tetragonal zirconia

Model of high-temperature plastic deformation of nanocrystalline materials: Application to yttria tetragonal zirconia

Sintered Properties of Stainless Steel-doped Y-TZP Ceramics

La importancia de la segregación de itrio en la deformación plástica de nanocristales de circonia tetragonal dopada con óxido de itrio (YTZP)

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