Solute segregation to grain boundaries and free surfaces in an FeSi multicomponent alloy

Measurements of solute segregation to free surfaces and grain boundaries in well-defined samples of α-Fe-Si model alloys revealed pronounced differences. Segregation of C and P and depletion of Si are characteristic for grain boundaries. Cosegregation of Si and N resulting in formation of silicon nitrides prevails at the majority of free surfaces in samples containing nitrogen, but S segregation dominates at the surfaces of nitrogen free samples. The results are summarized from the viewpoint of the type of interface, alloy composition and segregation temperature.

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High-resolution x-ray analysis of dislocation networks nn tilt boundaries

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100105126 ◽

1988 ◽

Vol 46 ◽

pp. 612-613

Author(s):

J. R. Michael ◽

C. H. Lin ◽

S. L. Sass

Keyword(s):

Grain Boundaries ◽

Analytical Electron Microscopy ◽

Solute Segregation ◽

X Ray ◽

Periodic Arrays ◽

Analytical Electron ◽

Primary Dislocation ◽

Tilt Boundaries ◽

Polycrystalline Solids ◽

Twist Boundaries

The segregation of solute atoms to grain boundaries in polycrystalline solids can be responsible for embrittlement of the grain boundaries. Although Auger electron spectroscopy (AES) and analytical electron microscopy (AEM) have verified the occurrence of solute segregation to grain boundaries, there has been little experimental evidence concerning the distribution of the solute within the plane of the interface. Sickafus and Sass showed that Au segregation causes a change in the primary dislocation structure of small angle [001] twist boundaries in Fe. The bicrystal specimens used in their work, which contain periodic arrays of dislocations to which Au is segregated, provide an excellent opportunity to study the distribution of Au within the boundary by AEM.The thin film Fe-0.8 at% Au bicrystals (composition determined by Rutherford backscattering spectroscopy), ∼60 nm thick, containing [001] twist boundaries were prepared as described previously. The bicrystals were analyzed in a Vacuum Generators HB-501 AEM with a field emission electron source and a Link Analytical windowless x-ray detector.

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Mean-field analytical calculation of the segregation profile around grain boundaries and free surfaces in binary alloys

Philosophical Magazine A ◽

10.1080/014186100300012607 ◽

2000 ◽

Vol 80 (12) ◽

pp. 2871-2897

Author(s):

I. P. Antoniades, G. L. Bleris

Keyword(s):

Grain Boundaries ◽

Binary Alloys ◽

Mean Field ◽

Analytical Calculation ◽

Free Surfaces ◽

Segregation Profile

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Direct measurement of non-equilibrium solute segregation to grain boundaries

Scripta Metallurgica ◽

10.1016/0036-9748(69)90072-6 ◽

1969 ◽

Vol 3 (9) ◽

pp. 663-665 ◽

Cited By ~ 7

Author(s):

S.J. Bercovici ◽

P. Niessen ◽

J.J. Byerley

Keyword(s):

Grain Boundaries ◽

Direct Measurement ◽

Solute Segregation ◽

Non Equilibrium

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The Measurement of Light Element Segregation Using EDS and EELS

Microscopy and Microanalysis ◽

10.1017/s1431927600023989 ◽

1998 ◽

Vol 4 (S2) ◽

pp. 772-773

Author(s):

J.T. Busby ◽

E.A. Kenik ◽

G.S. Was

Keyword(s):

Grain Boundaries ◽

Nuclear Reactor ◽

Reactor Core ◽

Light Element ◽

Free Surfaces ◽

Spatial Redistribution ◽

Core Components ◽

Radiation Induced ◽

Potential Interactions ◽

Impurity Elements

Radiation-induced segregation (RIS) is the spatial redistribution of elements at defect sinks such as grain boundaries and free surfaces during irradiation. This phenomenon has been studied in a wide variety of alloys and has been linked to irradiation-assisted stress corrosion cracking (IASCC) of nuclear reactor core components. However, several recent studies have shown that Cr and Mo can be enriched to significant levels at grain boundaries prior to irradiation as a result of heat treatment. Segregation of this type may delay the onset of radiation-induced Cr depletion at the grain boundary, thus reducing IASCC susceptibility. Unfortunately, existing models of segregation phenomena do not correctly describe the physical processes and therefore are grossly inaccurate in predicting pre-existing segregation and subsequent redistribution during irradiation. Disagreement between existing models and measurement has been linked to potential interactions between the major alloying elements and lighter impurity elements such as S, P, and B.

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Strategy to design high performance TiB 2 ‐based materials: Strengthen grain boundaries by solid solute segregation

Journal of the American Ceramic Society ◽

10.1111/jace.17018 ◽

2020 ◽

Vol 103 (5) ◽

pp. 3311-3320

Author(s):

Fu‐Zhi Dai ◽

Huimin Xiang ◽

Yanchun Zhou

Keyword(s):

Grain Boundaries ◽

High Performance ◽

Solute Segregation

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Solute Segregation in Ice Observed by Autoradiography

Journal of Glaciology ◽

10.1017/s0022143000026848 ◽

1970 ◽

Vol 9 (55) ◽

pp. 117-124 ◽

Cited By ~ 9

Author(s):

Yukiko Mizuno ◽

Daisuke Kuroiwa

Keyword(s):

Grain Boundaries ◽

Solute Segregation ◽

Dilute Solutions ◽

Chemical Impurities

Abstract Segregation of chemical impurities in ice formed from very dilute solutions was observed autoradiographically, using radioactive 22NaCl or H36Cl as β-ray tracers. When water containing such radioactive solutes was frozen, the segregation of solute occurred primarily along grain boundaries and partly in grains. Successive autoradiography enabled us to observe the heterogeneous distributions of segregated impurities in ice.

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