Results 261 to 270 of about 14,324 (302)

HREM of coherent precipitates in ZrO2 alloys

Ultramicroscopy, 1987
Abstract Coherent precipitates in ZrO 2 alloys, particularly those containing MgO or Y 2 O 3 , are the dominant microstructural feature in strong and tough transformation-toughened ZrO 2 -based ceramics. HREM has been used to study such precipitates in Mg-PSZ and Y-PSZ (MgO and Y 2 O 3 partially stabilized ZrO 2 ).
A.H. Heuer, V. Lanteri, R. Chaim
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An approximation to the description of growth of coherent precipitates

Kristall und Technik, 1981
AbstractThe tree‐dimensional growth of a spherical coherent particle in an isotropic infinite matrix is considered in the frame of the stationary solution of the classical diffusion equation applying WAGNERS approximation in a varied manner and taking into account both the concentration dependence of the diffusion constant D and the influence of ...
O. Simmich, H. Löffler
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On the coherency-loss problem of growing precipitates

Philosophical Magazine, 1971
Abstract A computer simulation technique is used to study the coherency strains around a growing precipitate at an atomic level. It is found that the presence of vacancies at the interface may reduce the long-range stresses in the matrix due to local microslip in the region of the vacancy.
K. E. Easterling, T. Johannesson
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A model for coherency strengthening of large precipitates

Scripta Materialia, 2014
In precipitation strengthening, the lattice misfit between precipitate and matrix produces a strain field around precipitates, which impedes dislocation movement. In this paper, a strengthening model is presented, which delivers the stress increment associated with the strain field around large homogeneous spherical precipitates.
M.R. Ahmadi, E. Povoden-Karadeniz, B. Sonderegger, K.I. Öksüz, A. Falahati, E. Kozeschnik   +5 more
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Coherent precipitation of silicon nitride in silicon

Applied Physics Letters, 1988
Coherent growth of α-Si3N4 precipitates is observed in a silicon matrix after implantation of 150 keV N+ at a dose of 1×1018/cm2 into (110) silicon. The near-channeling conditions lead to a band of discrete precipitates, 0.5 μm below the continuous, polycrystalline buried nitride layer.
V. S. Kaushik, A. K. Datye, D. L. Kendall, B. Martinez-Tovar, D. R. Myers   +4 more
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The elastic strain energy of growth ledges on coherent and partially coherent precipitates

Metallurgical and Materials Transactions A, 1994
The formation rate of growth ledges on a faceted precipitate strongly affects the growth kinetics and the shape of the precipitate. An Eshelby-type model is used to compare the strain energy associated with the nucleation of a ledge on different facet planes of a body-centered cubic (bcc) precipitate in face-centered cubic (fcc) matrix.
G. Chen, J. K. Chen, J. K. Lee, W. T. Reynolds   +3 more
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Loss in coherency and coarsening behavior of Al3Sc precipitates

Acta Materialia, 2004
Abstract The coarsening behavior of the Al3Sc particles in Al–0.2wt%Sc alloy at 673–763 K is studied on the basis of TEM observations with the numerical model. Emphasis is on the effects of coherent/semi-coherent transition of the particles. The radius for coherent/semi-coherent transition of the Al3Sc particles is determined from TEM micrographs as ...
S. Iwamura, Y. Miura
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Coherent precipitation of copper in Super304H austenite steel

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2013
Abstract The precipitation behavior of copper-rich phase in an austenitic stainless steel and the interface structure between the precipitates and the matrix have been investigated combining transmission electron microscopy and coarsening analysis. The fine dispersed Cu precipitates were spherical and highly stable in the austenite matrix, with the ...
P P Liu, Yuanmin Zhu, X M Li
exaly   +2 more sources

Coherent Precipitation — Phase Field Method

2005
Phase transformation is still the most efficient and effective way to produce various microstructures at mesoscales, and to control their evolution over time. In crystalline solids, phase transformations are usually accompanied by coherency strain generated by lattice misfit between coexisting phases.
C. Shen, Y. Wang
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Coarsening of ordered intermetallic precipitates with coherency stress

Acta Materialia, 2002
The morphological evolution and coarsening kinetics of ordered intermetallic precipitates with coherency stress were studied using a diffuse-interface phase-field model in two dimensions (2D). The emphasis is on the effects of precipitate volume fraction.
V. Vaithyanathan, L.Q. Chen
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