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Effect of Cation Doping on the Superplastic Flow in Yttria‐Stabilized Tetragonal Zirconia Polycrystals
Author(s) -
Mimurada Junpei,
Nakano Manabu,
Sasaki Kazutaka,
Ikuhara Yuichi,
Sakuma Taketo
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00920.x
Subject(s) - materials science , ionic radius , superplasticity , doping , cubic zirconia , tetragonal crystal system , dopant , yttria stabilized zirconia , flow stress , grain size , valence (chemistry) , strain rate , mineralogy , crystallography , composite material , ceramic , ion , chemistry , microstructure , crystal structure , optoelectronics , organic chemistry
The superplastic characteristics of various cation‐doped yttria‐stabilized tetragonal zirconia polycrystals (Y‐TZP) were examined. For 1 mol% cation doping the true stress of Y‐TZP is very dependent on the ionic radii of the doped cations; for instance, smaller cation radii give rise to lower true stress when compared with the other compositions for the same grain size, strain rate, and testing temperature. The altered true stress level must be due to the change in diffusivity of the accommodation process for grain boundary sliding caused by the addition of cations in ZrO 2 . The strain to failure of the doped zirconia is affected by both ionic radius and valence of the dopant cations.