日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 9 (2005),
pp. 835-840

Criterion for High Temperature Failure and Grain Boundary Chemistry in Superplastic TZP

Hidehiro Yoshida1,, Hitoshi Nagayama1,, Akihide Kuwabara2 and Taketo Sakuma1,

1Department of Advanced Materials Science, School of Frontier Science, The University of Tokyo, Tokyo 113-8656
2Department of Materials Science and Engineering, Faculty of Engineering, Kyoto University, Kyoto 606-0033

Abstract:

Temperature and strain rate dependence on high temperature elongation to failure in fine-grained ceramics is phenomenologically explained from grain growth behavior during deformation and the superplastic flow behavior. The elongation to failure at temperatures between 1573 and 1773 K was analyzed for 2 mol%TiO2 and 2 mol%GeO2 co-doped tetragonal zirconia polycrystal (TZP), which exhibits excellent high temperature ductility. The improvement in the high temperature ductility in TZP is attributed to dopant cation segregation in the vicinity of the grain boundaries. The phenomenological analysis revealed that co-doping of Ti and Ge cations increases the grain size at the time of failure, as a parameter to describe a limit of an accommodation process for superplastic flow. The parameter of the critical grain size at the time of failure correlates well with the value of overlap population in cation-doped TZP model cluster obtained from a first-principle molecular orbital calculation. The covalent bond at the grain boundaries plays a critical role in the high temperature tensile ductility of TZP.


(Received 2005/6/6)

Keywords:

tetragonal zirconia polycrystal, superplasticity, tensile ductility, grain boundary, molecular orbital calculation


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