Phase stability and microstructure evolution of yttria-stabilized zirconia during firing in a reducing atmosphere

Ho, Ching‐Hwa; Tuan, Wei‐Hsing

doi:10.1016/j.ceramint.2011.01.008

Cited by 16 publications

(7 citation statements)

References 33 publications

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“…A similar grain growth was observed in the deformation of 3Y-TZP under a flashing condition, which was reported by Yoshida et al [19]. Tuan et al [32] believed that the accelerated grain growth in a Y2O3-stabilized ZrO2 flashing condition was attributed to a reduced atmosphere. A previous study [13] revealed that an electrochemical reduction occurred during the electric current-assisted deformation of 3Y-TZP as a result of the oxygen-lean atmosphere, which was expressed as follows.…”

Section: Resultssupporting

confidence: 81%

“…A similar grain growth was observed in the deformation of 3Y-TZP under a flashing condition, which was reported by Yoshida et al [19]. Tuan et al [32] believed that the accelerated grain growth in a Y 2 O 3 -stabilized ZrO 2 flashing condition was attributed to a reduced atmosphere. Figure 4 shows the cross-sectional micrographs of the deformed 3Y-TZP specimen with 0A and 5A at a strain rate of 6.67 × 10 −4 s −1 .…”

Section: Resultssupporting

confidence: 80%

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Effects of an Electric Current on the Superplastic Deformation Behavior of 3Y-TZP in an Oxygen-Lean Atmosphere

Wang,

Zu,

Chen

et al. 2023

Materials

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The aim of this paper is to investigate the mechanism of an electric current-assisted superplastic deformation on 3Y-TZP in an oxygen-lean atmosphere. The experiments were performed with different electric currents in the range of 0~5 A. The results show that the flow stress of 3Y-TZP during the deformation was significantly decreased by the combination of Joule heating and the applied current effect. The microstructures of the deformed specimens were all equiaxed grains without an obvious preferential grain growth. The stress exponent n = 2.05~2.61 suggested that the dominant deformation of 3Y-YZP with/without the electric current was grain boundary sliding at 1400 °C. The activation energy of the deformation which decreased from 465 kJ mol−1 to 315 kJ mol−1 by the electric current indicated that the lattice diffusion of Zr cation during the deformation was enhanced. And the deformation rate of 3Y-TZP with the electric current may be controlled by the grain boundary diffusion of Zr cation.

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Section: Resultssupporting

confidence: 81%

“…A similar grain growth was observed in the deformation of 3Y-TZP under a flashing condition, which was reported by Yoshida et al [19]. Tuan et al [32] believed that the accelerated grain growth in a Y 2 O 3 -stabilized ZrO 2 flashing condition was attributed to a reduced atmosphere. Figure 4 shows the cross-sectional micrographs of the deformed 3Y-TZP specimen with 0A and 5A at a strain rate of 6.67 × 10 −4 s −1 .…”

Section: Resultssupporting

confidence: 80%

Effects of an Electric Current on the Superplastic Deformation Behavior of 3Y-TZP in an Oxygen-Lean Atmosphere

Wang,

Zu,

Chen

et al. 2023

Materials

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“…Zirconium alloys oxidise almost entirely due to the inward migration of oxygen ions [15]; this requires the generation of oxygen vacancies at the metal-oxide interface which migrate outwards. The impact of oxygen vacancies on the lattice structure is a leading theory for the stabilisation of manufactured tetragonal zirconia [10,[16][17][18]. Finally, zirconium alloys contain a range of alloying elements some of which, such as iron and chromium, have previously been shown to stabilise the tetragonal phase when used as a dopant [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of the tetragonal to monoclinic phase transformation during oxidation of zirconium alloys

Platt

Frankel

Gass³

et al. 2014

Journal of Nuclear Materials

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a b s t r a c tCorrosion is a key limiting factor in the degradation of zirconium alloys in light water reactors. Developing a mechanistic understanding of the corrosion process offers a route towards improving safety and efficiency as demand increases for higher burn-up of fuel. Oxides formed on zirconium alloys are composed of both monoclinic and meta-stable tetragonal phases, and are subject to a number of potential mechanical degradation mechanisms. The work presented investigates the link between the tetragonal to monoclinic oxide phase transformation and degradation of the protective character of the oxide layer. To achieve this, Abaqus finite element analysis of the oxide phase transformation has been carried out. Study of the change in transformation strain energy shows how relaxation of oxidation induced stress and fast fracture at the metal-oxide interface could destabilise the tetragonal phase. Central to this is the identification of the transformation variant most likely to form, and understanding why twinning of the transformed grain is likely to occur. Development of transformation strain tensors and analysis of the strain components allows some separation of dilatation and shear effects. Maximum principal stress is used as an indication of fracture in the surrounding oxide layer. Study of the stress distributions shows the way oxide fracture is likely to occur and the differing effects of dilatation and shape change. Comparison with literature provides qualitative validation of the finite element simulations.

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“…Impurity phases such as monoclinic zirconia and ZrC can be formed during the process [5]. Despite those studies, the effect of related atmospheres generated when C templating is used during sintering of Ni-YSZ on the physicochemical characteristics of nano-zirconia has attracted until now little attention [6]. It should be analysed especially when both sintering and in situ reduction of anodes for SOFCs are implemented together in the fabrication of those devices [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sintering Under CO+N 2/H 2 and CO 2+Air Atmospheres on the Physicochemical Features of a Commercial Nano-YSZ

Colomer¹,

Šimėnas²,

Banys³

et al. 2021

SSRN Journal

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Phase stability and microstructure evolution of yttria-stabilized zirconia during firing in a reducing atmosphere

Cited by 16 publications

References 33 publications

Effects of an Electric Current on the Superplastic Deformation Behavior of 3Y-TZP in an Oxygen-Lean Atmosphere

Effects of an Electric Current on the Superplastic Deformation Behavior of 3Y-TZP in an Oxygen-Lean Atmosphere

Finite element analysis of the tetragonal to monoclinic phase transformation during oxidation of zirconium alloys

Effect of Sintering Under CO+N <sub>2</sub>/H <sub>2</sub> and CO <sub>2</sub>+Air Atmospheres on the Physicochemical Features of a Commercial Nano-YSZ

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