Journal ArticleDOI
Dynamic Grain Growth During Superplastic Deformation of Yttria-Stabilized Tetragonal Zirconia Polycrystals
T.G. Nieh,Jeffrey Wadsworth +1 more
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TLDR
In this article, both static and dynamic grain growth was studied during superplastic deformation of fine-grained yttria-stabilized tetragonal zirconia.Abstract:
Both static and dynamic grain growth were studied during superplastic deformation of fine-grained yttria-stabilized tetragonal zirconia. It was found that significant grain growth does not take place below 1300°C. Both static and dynamic growth were found to obey a similar equation of the form D3−D30=kt, where D and D0 are the instantaneous and initial grain sizes, respectively, t is the annealing time, and k is the kinetic constant for either static or dynamic grain growth. The activation energies were approximately 580 and 520 kJ/mol for static and dynamic grain growth, respectively.read more
Citations
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Superplasticity in advanced materials
TL;DR: A review of superplasticity in polycrystalline materials can be found in this article, where the authors present an overview of these new developments using the established behavior of conventional metallic alloys as a standard for comparison with the mechanical properties of new materials.
Journal ArticleDOI
Densification and grain growth during sintering of nanosized particles
Zhigang Zak Fang,H. Wang +1 more
TL;DR: In this article, the effect of the initial grain growth cannot be ignored because that it is sufficient to cause the material to lose nanocrystalline characteristics and it is generally found that the sintering temperatures of nanosized particles are dramatically lower than that of their micrometre or submicrometer sized counterparts.
Journal ArticleDOI
Nanoparticulate materials densification
J.R. Groza,Robert J. Dowding +1 more
TL;DR: In this article, the authors addressed specific densification issues related to the nanocrystalline nature of the consolidating particulates. But, they focused on processes that have demonstrated the capability to form dense specimens with retention of fine grain sizes, and the experimental aspects cover powder compressibility and differential shrinkage, heating rate and pressure effects.
Journal ArticleDOI
The high temperature mechanical characteristics of superplastic 3 mol% yttria stabilized zirconia
David M. Owen,Atul H. Chokshi +1 more
TL;DR: In this paper, a detailed study was undertaken to characterize the deformation behavior of a superplastic 3 mol% yttria-stabilized tetragonal zirconia (3YTZ) over a wide range of strain rates, temperatures and grain sizes.
Journal ArticleDOI
Sintering kinetics and microstructure development of nanoscale Y-TZP ceramics
TL;DR: In this paper, Zirconia samples doped with 3 mol% yttria were prepared by gel precipitation from a metal chloride solution and their sintering behavior compared with that of a commercial powder.
References
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Journal ArticleDOI
The Impurity‐Drag Effect in Grain Boundary Motion
TL;DR: In this paper, the drag on a grain boundary produced by an impurity atmosphere is examined in detail, and is found to depend on the velocity of the grain boundary relative to the diffusivity of the impurity and its interaction with the grain boundaries.
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Superplasticity of yttria-stabilized tetragonal ZrO2 polycrystals
TL;DR: In this article, the uniaxial tensile deformation behavior of 3 molpercent Y/sub 2/O/sub 3/-tetragonal ZrO/Sub 2/ polycrystals was studied at temperatures up to 1500 C in ambient atmosphere.
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Grain Boundary Phases in a Hot-Pressed MgO Fluxed Silicon Nitride
David R. Clarke,Gareth Thomas +1 more
TL;DR: In this article, high-resolution electron microscopy lattice imaging studies of an MgO fluxed hot-pressed silicon nitride were conducted to show that intergranular second phases do indeed exist, but they are heterogeneously distributed.
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On the mechanism of strain-enhanced grain growth during superplastic deformation
TL;DR: In this article, a geometrical model is used to show how the recovery of this damage by boundary migration, enhances the normal grain growth process, based on the postulate of Holm el al.