Results 171 to 180 of about 2,415 (216)
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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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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
Jichen Dong +3 more
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Journal of Materials Science, 2005
The energetics of polycrystalline solids at high temperatures is treated using topological methods. The theory developed represents individual irregular polyhedral grains as a set of symmetrical abstract geometric objects called average N-hedra (ANH’s), where N, the topological class, equals the number of contacting neighbor grains in the polycrystal ...
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The energetics of polycrystalline solids at high temperatures is treated using topological methods. The theory developed represents individual irregular polyhedral grains as a set of symmetrical abstract geometric objects called average N-hedra (ANH’s), where N, the topological class, equals the number of contacting neighbor grains in the polycrystal ...
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1967
In many crystalline solids, the fracture event is intimately related to plastic deformation processes. In polycrystalline materials, the localized internal stresses generated by slip at grain boundaries depend on dislocation distribution and the ability to cross slip, i.e., slip character. The importance of deformation behavior, as influenced by solute
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In many crystalline solids, the fracture event is intimately related to plastic deformation processes. In polycrystalline materials, the localized internal stresses generated by slip at grain boundaries depend on dislocation distribution and the ability to cross slip, i.e., slip character. The importance of deformation behavior, as influenced by solute
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Intergrain scattering in polycrystals
Journal of Physics: Condensed MatterAbstract Transport through grain boundaries in polycrystals is described from first principles using quantum scattering theory, explicitly including Feshbach resonances to account for intermittently trapped electronic surface states.
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Yield Criteria for Anisotropic Polycrystals
2018Chapter 5 is devoted to modeling the elastic–plastic behavior of anisotropic polycrystalline metals. After introducing the only two rigorous methodologies for extending isotropic formulations such as to account for anisotropy, the most versatile three-dimensional orthotropic yield criteria for materials with the same response in tension and in ...
Oana Cazacu +2 more
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Optical Transmission in Polycrystals
Optica Acta: International Journal of Optics, 1972Optical transmission in a polycrystalline aggregate consisting of randomly oriented anisotropic transparent crystals has been worked using Mueller matrices. The interesting results are: (1) A completely polarized beam of light emerges as partially polarized light.
G.S. Ranganath, S. Ramaseshan
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Theory of surface polaritons in polycrystals
Physical Review B, 1995We have calculated the dispersion relation for surface polaritons propagating near the interface between a semi-infinite polycrystalline dielectric and a vacuum. A small anisotropy of single-crystal grains was assumed. The obtained complex frequency change is \ensuremath{\Delta}\ensuremath{\omega}=\ensuremath{\omega}(${\mathrm{\ensuremath{\kappa}}}_ ...
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The elasticity of polycrystals and rocks
Journal of Geophysical Research, 1975We calculate the effective elastic properties of various polycrystals and rocks using a self-consistent integral equation technique developed in the theory of disordered alloys. This technique includes but is more general than the self-consistent approximation developed by Hershey, Kroner (1958), and others.
E. Domany +2 more
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Stress-free joints and polycrystals
Archive for Rational Mechanics and Analysis, 1984Suppose stress-free, homogeneous but thermally anisotropic solid bodies (perhaps made of different materials) are joined together at a temperature \(\theta_ o\) along bounding surfaces which are pieces of planes. Under which conditions do the joints remain stress-free as the temperature changes? \textit{J. L. Ericksen} [J.
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