Results 261 to 270 of about 79,749 (313)

Dislocations in grain boundaries and grain boundary sliding

Acta Metallurgica, 1967
Abstract The Burgers vectors of grain boundary dislocations were analyzed by transmission electron microscopy in creep tested iron and iron alloys. The analysis indicates that the dislocations retain their original Burgers vectors when joining grain boundaries and remain undissociated. It is suggested that grain boundary sliding in creep is caused by
Y Ishida, M.Henderson Brown
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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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Grain boundary segregation produced by grain boundary movement

Scripta Metallurgica, 1983
Experimental evidence of grain boundary enrichment is given in a temperature region where the bulk diffusion is negligible. The phenomenon can be explained by supposing that the grain boundaries gather the dissolved atoms while passing through the grains.
M. Menyhárd, L. Uray
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Local investigation of grain boundaries by grain-boundary EBIC

Physica Status Solidi (a), 1993
Grain-boundary (GB) EBIC is an alternative EBIC geometry without a Schottky contact or p–n junction but with ohmic contacts on either side of a GB which itself acts as a charge collecting plane. The basic properties of the GB EBIC signal in the short-circuit mode and with application of an external bias are presented.
J. Palm, H. Alexander
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Impact of grain boundary character on grain boundary kinetics

Zeitschrift für Metallkunde, 2003
Abstract The current research on grain boundary dynamics in metals is reviewed. The boundary dynamics, i. e., the boundary reaction to applied forces, is strongly dependent on the grain boundary character, which is commonly reduced to the orientation relationship between adjacent grains and impurity segregation at the boundary.
D. A. Molodov, L. S. Shvindlerman, G. Gottstein   +2 more
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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 Network: Grain Boundary Texture

2012
If we try to understand the role of grain boundary networks in polycrystal properties, in order to promote special behaviours of the material, the first task is to establish then to control the grain boundary organization in that network. This is the objective of numerous studies dealing with the determination of the grain boundary characteristic ...
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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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