Results 211 to 220 of about 5,536 (261)
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Surface segregation as a guide to grain boundary segregation
Scripta Metallurgica, 1975Abstract 1. (i) Where grain boundary fracture is not possible for Aes examination, grain boundary segregants can be identified directly from surface segregation observations. 2. (ii) For quantitative evaluation of grain boundary segregation levels, a conversion diagram, incorporating both surface and grain boundary segregation curves as a ...
Colin Lea, M.P. Seah
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The segregation of impurities to grain boundaries
Acta Metallurgica, 1955Abstract It has been experimentally shown that polonium segregates to grain boundaries in an alloy of lead and 5 per cent bismuth in which the polonium was present to the extent of one part in 10 10 . The results show that the amount of polonium contained in the boundary is a function of the orientation of the crystals adjacent to the boundary and of
W.R. Thomas, B. Chalmers
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SEGREGATION AT GRAIN BOUNDARIES
Metallurgical Reviews, 1964Grain boundaries in crystalline solids exert a pronounced influence on almost all the properties of polycrystalline bodies, as well as affecting the kinetics of most solid-state processes that occur therein. They have therefore been the subject of numerous theoretical and experimental researches in both metallic and non-metallic ...
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Impurity Segregation to Grain Boundaries
Journal of Testing and Evaluation, 1973Abstract Minute quantities of impurities present in a material can have a major influence on the mechanical, chemical, or electrical properties of materials when they are segregated in localized regions. Since grain boundaries are often the preferred regions for segregation, it is not surprising that the properties of grain boundaries ...
A Joshi, DF Stein
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Grain Boundary Segregation. Grain Boundary Diffusion
1985In 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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Solute segregation at grain boundaries
Interface Science, 1996This feature article summarizes the present art and science of grain boundary segregation from the viewpoint of the authors activities in this field. In the part on equilibrium segregation, fundamental effects on grain boundary segregation are discussed such as the nature of the solute/matrix binary system, presence of additional elements, temperature,
Siegfried Hofmann, Pavel Leiĉek
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On the chemistry of grain boundary segregation and grain boundary fracture
Metallurgical Transactions A, 1990This paper considers the problem of impurity segregation in metals and the effect of these impurities on grain boundary cohesion. The primary goal of this paper is to provide a physical model that will allow us to think about these two processes. We describe both of them in chemical terms.
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Segregation and grain boundary structure
Surface Science Letters, 1984Abstract Atomic structure of the Σ = 5(210)/[001] symmetrical tilt boundary in Cu containing different amounts of segregated Bi has been investigated. The interatomic forces were described in terms of empirical pair potentials constructed so as to fit self consistently the enthalpy of mixing of this alloy system. The most important structural effects
V. Vitek, null Gui Jin Wang
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Journal of Materials Science, 2015
The Butler equation is extended to model equilibrium grain boundary (GB) energy and the equilibrium GB composition of a polycrystal, as a function of the following state parameters: bulk composition, temperature, pressure and the five degrees of freedom of the GB.
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The Butler equation is extended to model equilibrium grain boundary (GB) energy and the equilibrium GB composition of a polycrystal, as a function of the following state parameters: bulk composition, temperature, pressure and the five degrees of freedom of the GB.
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2012
The phenomenon by which a local enrichment in solutes (controlled additions or impurities) occurs in a material is named segregation; it results from a redistribution of the solutes between the crystals and certain faulted sites, like dislocations, surfaces, interfaces, during a thermal or thermo-mechanical treatment.
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The phenomenon by which a local enrichment in solutes (controlled additions or impurities) occurs in a material is named segregation; it results from a redistribution of the solutes between the crystals and certain faulted sites, like dislocations, surfaces, interfaces, during a thermal or thermo-mechanical treatment.
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