Results 221 to 230 of about 41,961 (266)

Instability of grain boundary grooves due to equilibrium grain boundary diffusion

Acta Metallurgica et Materialia, 1991
Abstract All previous theoretical investigations on grain boundary grooving are based on the assumption, that the grain boundary does not participate in the material transport. In the present paper it is shown theoretically and experimentally for the first time, that by removing this restriction one obtains completely different groove profiles in ...
Vogel, H.J., Ratke, L.
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Grain Boundary Segregation. Grain Boundary Diffusion

1985
In polycrystalline materials, grain boundaries differ from the monocrystalline bulk by : i) their structure, ii) their electronic properties, iii) their chemical composition, iv) the atomic mobility of all the species.
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Viscous grain-boundary sliding and grain rotation accommodated by grain-boundary diffusion

Acta Materialia, 2005
When the sliding of a viscous grain boundary is accommodated by grain-boundary diffusion, we evaluate the sliding rate and the stress distribution on the boundary, by employing the energy-balance method developed by Mori et al. [Mori T, Nakasone Y, Taya M, Wakashima K. Phil Mag Lett 1997;75:359 and Mori T, Koda M, Monzen R, Mura T.
B.-N. Kim, K. Hiraga, K. Morita
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On the chemistry of grain boundary segregation and grain boundary fracture

Metallurgical Transactions A, 1990
This paper considers the problem of impurity segregation in metals and the effect of these impurities on grain boundary cohesion. The primary goal of this paper is to provide a physical model that will allow us to think about these two processes. We describe both of them in chemical terms.
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The Elimination of Grains and Grain Boundaries in Grain Growth

Interface Science, 1997
The topological changes that occur during coarsening of 2D and 3Dcellular structures, such as polycrystals, areinvestigated. Particular attention is given to the elimination ofgrain boundaries and grains with more than the minimum number oftopological elements.
A.C. Ferro, M.A. Fortes
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The Role of Σ9 Boundaries in Grain Boundary Engineering

Metallurgical and Materials Transactions A, 2010
In a grain-boundary-engineered (GBE) microstructure, Σ9 boundaries are the second most abundant boundary type. This article presents data showing that, in GBE copper, most Σ9s were special. Σ9 boundaries are also a geometrically necessary component of a GBE microstructure.
V. Randle, M. Coleman, M. Waterton
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The Role of Grain Boundary Curvature in Diffusional Deformation: Control of Grain Boundary Sliding by Grain Boundary Mobility

SSRN Electronic Journal, 2020
The diffusion processes involved in the accommodation of grain boundary sliding in diffusional deformation are revisited by considering the role of grain boundary curvature and of the associated grain boundary migration. A method is developed for calculating grain boundary profiles, diffusional fluxes, and the dissipation power arising from the ...
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Grains, grain boundaries and interfaces

2004
The topic of grains and grain houndaries is extremely vast and covers many different concepts, involving not only the associated microstructural features, hut also the effects on material characteristics such as corrosion resistance and mechanical properties.
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Boundary conditions at grain boundaries

Journal of Applied Physics, 1983
Grain boundaries in polycrystalline semiconductor material are frequently idealized as surfaces possessing a characteristic surface recombination velocity. Minority carrier densities generated by external sources (electron beams, light, etc.) in polycrystalline p–n junctions must satisfy certain boundary conditions at these grain boundaries which will ...
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A theory of grain boundaries that accounts automatically for grain misorientation and grain-boundary orientation

Journal of the Mechanics and Physics of Solids, 2008
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