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Formation of Twinned Graphene Polycrystals
Angewandte Chemie - International Edition, 2019AbstractLiquid metals have been widely used as substrates to grow graphene and other 2D materials. On a homogeneous and isotropic liquid surface, a polycrystalline 2D material is formed by coalescence of many randomly nucleated single‐crystal islands, and as a result, the domains in a polycrystal are expected to be randomly aligned. Here, we report the
Dechao Geng, Feng Ding, Jichen Dong
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Physical Review, 1963
The problem of the prediction of the effective electric or thermal conductivity of a polycrystal in terms of the conductivities of the constituting single crystals is treated by a variational method. It is assumed that the crystals are all of the same kind and randomly oriented.
Z. Hashin, S. Shtrikman
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The problem of the prediction of the effective electric or thermal conductivity of a polycrystal in terms of the conductivities of the constituting single crystals is treated by a variational method. It is assumed that the crystals are all of the same kind and randomly oriented.
Z. Hashin, S. Shtrikman
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Materials Characterization, 1972
Abstract The shape, distribution, arrangement, and stability of cells in a typical foam and polycrystal are compared, and their observed dissimilarity is attributed to a fundamental difference in the structure of the two systems. In particular, it is shown that certain features of a polycrystal may be accounted for, if the surface of its grains is ...
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Abstract The shape, distribution, arrangement, and stability of cells in a typical foam and polycrystal are compared, and their observed dissimilarity is attributed to a fundamental difference in the structure of the two systems. In particular, it is shown that certain features of a polycrystal may be accounted for, if the surface of its grains is ...
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The electrodynamics of polycrystals
Physics Reports, 1997Abstract In the present review some transport electromagnetic phenomena in polycrystals with both small and large anisotropy are discussed. Three different approaches have been used: a qualitative one, perturbation theory and some exact solutions. 2-D and 3-D physical systems are considered.
A.M. Dykhne, I.M. Kaganova
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Modulation piezoreflectance of cubic polycrystals
Physica Status Solidi (a), 1983A method for evaluating the hydrostatic component of the piezoreflectance tensor by means of two measurements of the ac piezoreflectance spectra of polycrystalline germanium in polarized light is given. On presente une methode pour obtenir la composante hydrostatique du tenseur de la piezoreflexion en utilisant deux spectres de la reflectivite ...
L. Bočánek, J. Musilová
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The yield surface of textured polycrystals†
Journal of the Mechanics and Physics of Solids, 1985The plastic anisotropy of a material is characterized in part by its yield surface. It is shown that conventional descriptions, based on extensions of the von Mises hypothesis for isotropic materials, are experimentally and theoretically inadequate in many instances.
Canova, G. R. +3 more
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The scattering of ultrasonic waves by polycrystals
Physica Status Solidi (a), 1981The attenuation coefficients of longitudinal and transverse waves are calculated for polycrystals of triclinic and higher symmetries over the entire frequency range. The calculation is made in the Bourret approximation by the methods of renormalization of the wave equation and re-expansion taking account of multiple scattering, with exponential ...
O. A Grigorev, T . D Shermergor
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2003
Abstract So far, we have studied the martensitic transformation and the shape-memory effect in single crystals where the reference lattice or the lattice of the high-temperature parent austenite phase is uniform across the specimen. However, typical commercial specimens are polycrystals: they are an agglomeration of a very large number ...
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Abstract So far, we have studied the martensitic transformation and the shape-memory effect in single crystals where the reference lattice or the lattice of the high-temperature parent austenite phase is uniform across the specimen. However, typical commercial specimens are polycrystals: they are an agglomeration of a very large number ...
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Acta Metallurgica, 1958
Abstract The idea that polyslip, i.e. simultaneous glide of dislocations in many slip systems of each grain, is responsible for the plastic deformation of cubic polycrystals at low enough temperatures is discussed in the light of new evidence. Taylor's formula for the calculation of the polycrystalline stress-strain curve from the shear-hardening ...
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Abstract The idea that polyslip, i.e. simultaneous glide of dislocations in many slip systems of each grain, is responsible for the plastic deformation of cubic polycrystals at low enough temperatures is discussed in the light of new evidence. Taylor's formula for the calculation of the polycrystalline stress-strain curve from the shear-hardening ...
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2012
Grain boundaries are internal interfaces and behave much like external surfaces; but now we have to be concerned with two crystal orientations, not one. Just as for surfaces, we have a pressure difference associated with the GB curvature and a driving force that tends to lead to an overall increase in grain size whenever possible.
C. Barry Carter, M. Grant Norton
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Grain boundaries are internal interfaces and behave much like external surfaces; but now we have to be concerned with two crystal orientations, not one. Just as for surfaces, we have a pressure difference associated with the GB curvature and a driving force that tends to lead to an overall increase in grain size whenever possible.
C. Barry Carter, M. Grant Norton
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