Results 161 to 170 of about 8,297 (199)

Grain boundary diffusion and grain boundary segregation of tellurium in silver

Acta Metallurgica et Materialia, 1993
Using the radiotracers 121Te and 123Te with high specific activity, grain boundary (GB) diffusion of Te in Ag has been studied in a wide temperature interval of about 600 K. At low temperatures (378–504 K) Harrison's type-C regime has been realized, which has enabled us to perform a number of direct measurements of the GB diffusion (GBD) coefficient ...
Chr. Herzig, J. Geise, Yu. Mishin
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Grain boundary segregation and fracture

Zeitschrift für Metallkunde, 2005
Abstract This paper describes a combined thermodynamic and micro-mechanical model for the propagation of a grain boundary crack through a solid in which stress concentrations ahead of the crack and plastic deformation around the crack tip are considered.
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Retardation Effect of Grain Boundary Segregation on Grain Boundary Diffusion

Defect and Diffusion Forum, 2006
The effect of grain boundary segregation (GBS) on grain boundary diffusion (GBD) is analyzed in frame of the new model. This model supposes the formation of the specific “nuclei” in a grain boundary (GB) solid solution. Their composition is close to that of the nearest phase in grain in equilibrium with solid solution in grain.
Boris Bokstein, Alexey Rodin, A.N. Smirnov   +2 more
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Grain Boundary Diffusion and Grain Boundary Segregation in Metals and Alloys

Diffusion Foundations, 2014
In the present article the authors make an attempt to survey briefly the main landmarks of the GBD, to set off the most interesting results of the last years, to underline some gaps between expected and observed experimental data and to direct possible ways of their explanation.
Boris Bokstein, Alexey Rodin
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Selective segregation at grain boundaries

Canadian Metallurgical Quarterly, 1974
Abstract Experimental observations provide support for two different types of solute enhancement at interfaces, namely equilibrium and non-equilibrium segregation. It is shown that these segregation processes are dependent upon the structures of different large-angle grain boundaries.
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Grain boundary segregation in metals

Proceedings, annual meeting, Electron Microscopy Society of America, 1992
Grain boundary segregation is the process by which solute elements in a material diffuse to the grain boundaries, become trapped there, and increase their local concentration at the boundary over that in the bulk. As a result of this process this local concentration of the segregant at the grain boundary can be many orders of magnitude greater than the
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Segregation and the strength of grain boundaries

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1976
Abstract A quantitative theory is presented which explains how solute segregation alters grain boundary strength. A simple treatment shows that, because of an incorrect assumption, previous theories in which segregation was thought to cause low temperature brittleness by lowering the grain boundary work of fracture are incorrect and ...
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Grain-Boundary Fragility and Segregation

Metal Science Journal, 1972
AbstractIntergranular embrittlement induced by equilibrium segregation of solutes is now recognized in a number of engineering alloys, particularly in ferrous systems. In such multicomponent systems, grain-boundary segregation effects can be quite complex, with competitive interactions among a number of surface-active species.
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Grain Boundary Diffusion and Grain Boundary Segregation

1998
B. Bokstein, N. Balandina
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Grain boundary segregation

Acta Metallurgica, 1959
M.C. Inman, H.R. Tipler
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