Results 251 to 260 of about 6,691 (300)

Effect of extrinsic grain-boundary defects on grain-boundary sliding resistance

Philosophical Magazine A, 1999
Abstract A computer simulation was performed to examine the role of extrinsic grain-boundary (GB) defects in the sliding of the {11, (101){131} symmetric tilt boundary in aluminium by means of an embedded-atom method potential. The sliding resistance of the equilibrium GB was determined from a computation of the dependence of the boundary energy on in ...
R. J. Kurtz, R. G. Hoagland, J. P. Hirth
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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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The Nature of Grain Boundary Sliding and the Superplastic Plow

Physica Status Solidi (a), 1983
Two types of grain boundary sliding are established and investigated during Zn bicrystal deformation: “pure” grain boundary sliding (GBS) which is not associated with intragranular sliding (IS) and GBS which develops simultaneously with IS. Both types of GBS exhibit greatly similar structural peculiarities but under identical deformation conditions the
R. Z. Valiev, O. A. Kaibyshev, V. V. Astanin, A. K. Emaletdinov   +3 more
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The role of partial grain boundary dislocations in grain boundary sliding and coupled grain boundary motion

Journal of Materials Science, 2006
We study the process of grain boundary sliding through the motion of grain boundary dislocations, utilizing molecular dynamics and embedded atom method (EAM) interatomic potentials. For a Σ = 5 [001]{310} symmetrical tilt boundary in bcc Fe, the sliding process was found to occur through the nucleation and glide of partial grain boundary dislocations ...
Joshua Monk, Brian Hyde, Diana Farkas
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The role of grain boundary dislocations in grain boundary sliding

Acta Metallurgica, 1973
Abstract Dislocation models for grain boundary sliding have generally invoked lattice dislocations moving along the boundary as the basic mode of deformation. This paper considers the possibility of structural dislocations accounting for the same phenomenon.
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Grain-Boundary Sliding in Metals

Metallurgical Reviews, 1966
AbstractGrain-boundary sliding is the relative translation of a pair of grains by a shear movement at their common interface. This definition is meant to include cases where shear takes place in a zone of finite width around the boundary, and cases in which sliding is a shear confined completely to the interface, if indeed this latter ever actually ...
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A simple mechanical model for grain boundary sliding in nanocrystalline metals

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, 2012
In this paper we consider grain boundary sliding as a dominant mechanism of plasticity in nanocrystalline metals. A mechanical model for barrier resistance to sliding has been proposed.
E N Borodin, A E Mayer
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On grain boundary sliding and diffusional creep

Metallurgical Transactions, 1971
The problem of sliding at a nonplanar grain boundary is considered in detail. The stress field, and sliding displacement and velocity can be calculated at a boundary with a shape which is periodic in the sliding direction (a wavy or stepped grain boundary): a) when deformation within the crystals which meet at the boundary is purely elastic, b) when ...
R. Raj, M. F. Ashby
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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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On the migration of grain boundaries during sliding

Scripta Metallurgica, 1989
Analyse par une technique de piqures d'attaque et par etude microstructurale de la migration des joints de glissement dans les bicristaux Cu-9% at.
S. Hashimoto, B. Baudelet
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