Superplastic Behavior in GeO2 - TiO2 Doped TZP

H. Ito; Hidehiro Yoshida; Yuichi Ikuhara; Takahisa Yamamoto; T. Sakuma

doi:10.4028/www.scientific.net/KEM.317-318.407

Paper Titles

Corrosion Resistance of Commercial Si₃N₄ Bearing Balls
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Characteristic Evaluation of High Corrosion Resistant Ti/ (Pt + B₂O₃) Electrode with New Microstructure of Coat
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Effect of Chemical Composition of Intergranular Glass on Superplastic Deformation of β-Silicon Nitride
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Superplastic Deformation of Silicon Nitride Nanocomposite at High Strain Rates
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Superplastic Behavior in GeO₂ - TiO₂ Doped TZP
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Surface Diffusion and Incorporation Process of Adatom in Fe-Al Multilayer System
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Oxygen Diffusion along Symmetric [0001] Tilt Grain Boundaries in α-Alumina
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Oxynitride Glasses and Their Properties - Implications for High Temperature Performance of Silicon Nitride-Based Ceramics
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High-Temperature Properties of Silicon Nitride with Lu-Si-O-N Grain Boundary Phases
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 317-318Superplastic Behavior in GeO2 - TiO2 Doped TZP

Superplastic Behavior in GeO₂ - TiO₂ Doped TZP

Abstract:

Superplastic behaviors were investigated for fine-grained yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) from a viewpoint of GeO2 or TiO2 doping. It was found that both dopants enhance the ductility in TZP. In particular, elongation to failure of 988% could be obtained in 3Y-TZP co-doped with 2mol%GeO2 and 2mol%TiO2. In addition, it was revealed that lower flow stress did not always give a larger elongation in this system. On the other hand, the strong segregation of dopants along grain boundaries was confirmed by high-resolution electron transmission microscopy study (HRTEM) with X-ray energy dispersive spectrometer (EDS). The unique phenomena observed in the relation between flow stress and ductility is closely related to the strong segregation of dopants along grain boundaries in this system. The grain size at fracture is determined by covalency because of the dopant segregation. It could be concluded that elongation to failure is closely related to a balance between grain size at fracture and grain growth rate during deformation.