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Grain Growth Kinetics in Alumina–Zirconia (CeZTA) Composites
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TLDR
In this paper, grain growth in alumina-rich, zirconia-alumina composites was examined as a function of volume fraction of ZIRconia and the microstructural scale and character alter during grain growth.Abstract:
Grain growth kinetics in alumina-rich, zirconia-alumina composites have been examined as a function of volume fraction of zirconia. Both the microstructural scale and character alter during grain growth. Grain growth exponents between n = 3 and 4 were observed and have been rationalized in terms of current models for grain growth and particle coarsening. Grain growth constants were measured and compared with available data. Coupled grain growth was observed in that the ratio of the alumina-to-zirconia grain size was constant, for a given zirconia content. This behavior is discussed in terms of the topological constraint present during growth and the observed microstructural evolution. The measured activation energies were consistent with boundary-diffusion-controlled grain growth.read more
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Quantitative analysis of microstructure and its related electrical property of SOFC anode, Ni-YSZ cermet
TL;DR: In this paper, the microstructural and electrical properties of Ni-YSZ composite anode of solid oxide fuel cells (SOFC) were investigated by measuring the electrical conductivity via 4-probe DC technique as a function of Ni content (10−70 vol%) in order to examine the correlation with the microstructure of Ni−YSZ cermet.
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Textured development of feeble magnetic ceramics by colloidal processing under high magnetic field
Yoshio Sakka,Tohru S. Suzuki +1 more
TL;DR: In this paper, the authors introduced a new processing of textured ceramics with a feeble magnetic susceptibility by slip casting in a high magnetic field and subsequent heating, which can be applied to other non-cubic cerams, such as TiO 2, ZnO, SnO, hydrooxy apatite (HAP), AIN, SiC, Si 3 N 4, etc.
Journal ArticleDOI
Exceptional resistance to grain growth in nanocrystalline CoCrFeNi high entropy alloy at high homologous temperatures
TL;DR: In this article, Nanocrystalline CoCrFeNi high entropy alloy, synthesized by mechanical alloying followed by spark plasma sintering, demonstrated extremely sluggish grain growth even at very high homologous temperature of 0.68 t m (900 °C) for annealing duration of 600h.
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The role of second phases for controlling microstructural evolution in polymineralic rocks: A review
TL;DR: In this article, the authors present a review of the microstructural evolution in polymineralic microfabrics under static and deformational conditions. But the authors focus on the effect of coupled grain growth, mass transfer processes, and deformation mechanisms.
The role of second phases for controlling microstructural evolution in polymineralic rocks
Abstract: Abstract We present a state-of-the-art review of the microstructural evolution in rocks under static and deformational conditions. First, the general concepts and processes are introduced using monomineralic aggregates. Then, they are expanded into the more complex context of polymineralic rocks with a dominant matrix phase. The first part of this contribution delivers information on sample strategies to quantify polymineralic microfabrics. Based on comparisons between microfabrics of monomineralic and polymineralic rocks, we use the common knowledge collected over the past decades for monomineralic systems and discuss the differences to polymineralic ones in terms of microstructures, modal compositions, spatial distribution of phases, crystallographic preferred orientations and associated processes. The article puts particular emphasis on the effect of coupled grain growth, mass transfer processes, and deformation mechanisms. We speculate on the effect of mineral reactions during the evolution of microstructures and rheology in polymineralic aggregates at different metamorphic conditions. At the end of the article, we demonstrate the great potential of grain-size evolution maps as microstructural tool to unravel the geological history of polymineralic rocks that evolved under a variety of geodynamic situations.
References
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On the theory of normal and abnormal grain growth
TL;DR: In this article, a growth equation for individual grains in single-phase materials is suggested, which is used to calculate a rate equation for normal grain growth and the size distribution in the material.
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Stability of Tetragonal ZrO2 Particles in Ceramic Matrices
TL;DR: In this paper, the stability of tetragonal ZrO2 particles in ceramic matrices was considered, with particular reference to Al2O3-ZrO 2 composites and to partially stabilized TZRO 2.
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Development of Superplastic Structural Ceramics
I-Wei Chen,Liang An Xue +1 more
TL;DR: Newnham et al. as mentioned in this paper showed that the selection of an appropriate phase and the tailoring of the grain boundary or liquid-phase composition can sometimes drastically alter the cavitation resistance.
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Grain growth in metals
TL;DR: In this paper, the sizes and shapes of grains in annealed metals, characterised respectively by the grain diameters and the interfacial angles, are shown to be lognormally distributed in planar sections as well as in space.
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Computer simulation of normal grain growth in three dimensions
TL;DR: In this paper, the microstructure of polycrystalline materials is digitized by dividing the polycrystaline material into small volume elements and storing the spatial location and crystallographic orientation of each element.