Creep deformation in a 3 mol% Y{sub 2}O{sub 3}-stabilized tetragonal zirconia
The high temperature deformation behavior of a 3 mol% yttria-stabilized tetragonal zirconia (3Y-TZP) is examined. The analysis of creep strain rate, which was monitored directly with an optical extensometer and corrected for the current grain size, reveals a sigmoidal feature in the true stress-creep rate relationship. At lower stresses, a stress exponent n of {approximately}1.6 incorporated with a grain size exponent of 2.0 suggests the intervention of a lattice diffusion creep mechanism. For higher stresses where n {approximately} 2.7, evidence of intragranular dislocation activities suggests that dislocations may play an important role in the accommodation process for grain boundary sliding in 3Y-TZP.
- Research Organization:
- National Research Inst. for Metals, Ibaraki (JP)
- OSTI ID:
- 20104662
- Country of Publication:
- United States
- Language:
- English
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