Results 221 to 230 of about 24,096 (268)

Microstructural Evolution in Triaxial Porcelain

Journal of the American Ceramic Society, 2000
Microstructural evolution in a model triaxial porcelain was studied by X‐ray diffractometry and electron microscopy of quenched samples after firing for 3 h at 600°–1500°C. The clay component dehydroxylated to metakaolin at ∼550°C. Metastable sanidine formed from decomposition of the feldspar at >600°C and dissolved at >900°C.
Yaseen Iqbal, William Edward Lee
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Microstructural evolution of buffers

Engineering Geology, 1999
A buffer consisting of blocks of compacted Na bentonite powder absorbs water by which the grains expand and exfoliate, yielding clay gels that occupy the voids between them. The expandability of the grains and thereby the bulk density and hydraulic conductivity depend on the density of the gel fillings and hence on the grain density.
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Microstructural evolution and hardening parameters

Materials Science and Engineering: A, 2001
The evolution of dislocation structures in polycrystals with increasing strain is described within a framework of grain subdivision by dislocation boundaries and high angle boundaries. The evolving microstructures are characterized with emphasis on morphology and the changes in the misorientation angle across and spacing between deformation induced ...
Niels Hansen, X. Huang, D.A. Hughes
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Microstructural evolution in bone china

British Ceramic Transactions, 2000
Abstract Phase and microstructural evolution in model bone china bodies was determined by XRD and electron microscopy of quenched samples fired for 3 h at 600–1500°C. Unfired but shaped bone china comprised bone ash and clay agglomerates (≤70 μm) in a matrix of smaller (from submicron to 10 μm) mixed clay, feldspar, and bone ash particles.
Y. Iqbal, P.F. Messer, W.E. Lee
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Microstructure Evolution During Batch Annealing

Journal of Materials Engineering and Performance, 2003
Design of industrial annealing cycles requires recrystallization and grain growth studies, which are typically carried out under isothermal laboratory condition. The kinetics coefficients of these phase transformations are obtained from such studies, which are subsequently used in designing the industrial nonisothermal cycles using the additivity ...
Satyam S. Sahay, B.V. Harish Kumar, Sangeetha J. Krishnan   +2 more
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Microstructural evolution in silica aerogel

Journal of Non-Crystalline Solids, 2007
Microstructural evolution in silica aerogel has been observed in samples produced by the hydrolysis and polycondenzation of tetramethylorthosilicate that was acid catalyzed. Drying of the silica gel was performed by replacing its liquid phase with liquid carbon dioxide, which was removed under high pressure and low temperature conditions in a critical ...
Carlos Folgar, Diane Folz, Carlos Suchicital, David Clark   +3 more
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Microstructural evolution during directional annealing

Acta Materialia, 2002
Development of a columnar-grained structure and its continued propagation during directional annealing has been studied using a front-tracking, grain-growth model. The effects of the initial microstructure, hot zone velocity, and hot zone width were investigated for a single-phase system without a texture.
A.Y Badmos, H.J Frost, I Baker
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Microstructural Evolution and Coherent Islands

MRS Proceedings, 1992
ABSTRACTMicrostructural evolution in systems containing strained islands (coherent, incoherent or both) is investigated. The growth rate of an individual island coarsening in an ensemble of strained islands is obtained by including elastic effects on surface diffusion of adatoms to and the equilibrium solubility of strained islands.
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“Evolution” of microstructure in materials

International Journal of Materials Research, 2008
Abstract The term “evolution” is used in both biology and materials science. There are however large differences in what is meant by it. It will be shown that one difference is the probability of single or multi step nucleation. Biological structures are too complex to be recreatable by nucleation.
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Nonlinear Acoustics for Microstructural Evolution

2016
Acoustic nonlinearity holds the potential of becoming the primary means of characterizing microstructural evolution caused by, for instance, fatigue of metals, because it is capable of probing the processes of dislocation movement (Hikata et al. (1966); Hikata and Elbaum (1966); Cantrell and Yost (1994)) and crack nucleation and growth (Buck et al ...
Masahiko Hirao, Hirotsugu Ogi
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