Paper Title:
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.

  Info
Periodical
Key Engineering Materials (Volumes 317-318)
Edited by
T. Ohji, T. Sekino and K. Niihara
Pages
407-410
DOI
10.4028/www.scientific.net/KEM.317-318.407
Citation
H. Ito, H. Yoshida, Y. Ikuhara, T. Yamamoto, T. Sakuma, "Superplastic Behavior in GeO2 - TiO2 Doped TZP", Key Engineering Materials, Vols. 317-318, pp. 407-410, 2006
Online since
August 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hidehiro Yoshida, Katsuyuki Matsunaga, Takahisa Yamamoto, Yuichi Ikuhara
299
Authors: Hitoshi Nagayama, Akihide Kuwabara, Hidehiro Yoshida, Taketo Sakuma
365
Authors: Lan Yi Wang, Cheng Xiang Lu, Guo Yi Tang
Abstract:Two types of multilayer ZnO varistors are prepared by the chemically synthesized (CS) powder and the mixed oxide (MO) powder. The ceramic...
739
Authors: Marek Boniecki, Rafał Jakieła, Zdzislaw Librant, Wladyslaw Wesolowski, Danuta Dabrowska, Agata Karas
Abstract:The superplastic flow in tetragonal zirconia polycrystals stabilised 3mol% Y2O3 (3YTZP) is strongly affected by the dopant cations, which...
1626
Authors: Yorinobu Takigawa, Takahisa Yamamoto, Kenji Higashi
Abstract:The effect of grain boundary segregated dopant on phase stability of tetragonal zirconia polycrystal (TZP) is examined by accelerated...
2208