Results 211 to 220 of about 39,878 (262)

Grain boundary segregation and grain-boundary heterodiffusion

Philosophical Magazine A, 1992
Abstract It is shown that nonlinear segregation effects (saturation, interaction of species) lead to nonlinear grain-boundary penetration plots. If the diffusion penetration depth is larger than a critical value, the concentration profiles become linear.
B. S. Bokstein, V. E. Fradkov, D. L. Beke   +2 more
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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 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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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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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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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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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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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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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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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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