Experimental evidence for diffusion creep in the superplastic 3 mol% yttria-stabilized tetragonal zirconia |
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| Affiliation: | 1. Centro de Análises Proteômicas e Bioquímicas, Programa de Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília-DF, Brazil;2. UDF – Centro Universitário, Brasília, DF, Brazil;3. Embrapa Recursos Genéticos e Biotecnologia – Laboratório de Biologia Sintética, Brasília-DF, Brazil;4. Programa de Pós Graduação em Ciências e Tecnologias em Saúde, Universidade de Brasília – UnB, Ceilândia-DF, Brazil;5. S-Inova, Pós-graduação em Biotecnologia, Universidade Católica Dom Bosco, Campo Grande MS, Brazil;6. Programa de Pós-Graduação em Educação Física, Universidade Católica de Brasília, Brasília-DF, Brazil;1. Department of Nutrition, University of North Carolina at Greensboro (UNCG), Greensboro, NC 27402, USA;2. Department of Kinesiology, UNCG, Greensboro, NC 27402, USA;3. Department of Pathology, Section on Lipid Sciences, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA;4. Department of Statistics, UNCG, Greensboro, NC 27402, USA |
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| Abstract: | Although there have been numerous studies on the high temperature deformation characteristics of the superplastic 3 mol% yttria stabilized tetragonal zirconia (3YTZ), the rate controlling deformation mechanism has not been identified unambiguously. In the present study, experiments were conducted on 3YTZ at high stresses and at coarser grain sizes than used conventionally for superplasticity. The experimental results reveal, for the first time, an intragranular dislocation motion controlled high stress regime that is independent of the grain size. With a decrease in stress, there is a transition to a Newtonian viscous deformation regime consistent with Coble grain boundary diffusion creep. At sufficiently low stresses, or in materials with finer grain sizes, there is a further transition to a grain size dependent interface controlled deformation regime. Analysis of the experimental data suggests strongly that superplastic flow in 3YTZ occurs by an interface controlled deformation mechanism. |
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