Results 211 to 220 of about 49,849 (265)

EVOLUTION OF GRAIN BOUNDARIES

Mathematical Models and Methods in Applied Sciences, 2001
Evolution and trend to equilibrium of a (planar) network of grain boundaries subject to curvature driven growth is established under the assumption that the system is initially close to some equilibrium configuration. Curvature driven growth is the primary mechanism in processing polycrystalline materials to achieve desired texture, ductility ...
Kinderlehrer, David, Liu, Chun
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Grain Boundary Grooving as an Indicator of Grain Boundary Phase Transformations

Interface Science, 2001
The atomic force microscopy (AFM) was used to study the grain boundary (GB) groove profiles far away from the melting temperature T m. It is shown that AFM allows one to measure the temperature dependence of the GB energy in a rather broad temperature interval (from 0.85 T m to T m). The GB energy and GB segregation of Bi were measured at 1123 K in the
Schölhammer, J., Baretzky, B., Gust, W., Mittemeijer, E., Straumal, B.   +4 more
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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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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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Role of grain boundary plane in grain boundary engineering

Materials Science and Technology, 2010
There is an increasing amount of interest in grain boundary engineering (GBE) to improve the properties of the grain boundary network. In general, research has concentrated on use of a grain boundary misorientation based approach, namely, the coincidence site lattice (CSL), to categorise ‘special’ boundaries.
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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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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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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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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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