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

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

The Measurement of Light Element Segregation Using EDS and EELS

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.

Helium release in uranium dioxide in relation to grain boundaries and free surfaces

2010 ◽  
Vol 268 (11-12) ◽  
pp. 2133-2137 ◽  
Author(s):  
G. Martin ◽  
P. Garcia ◽  
C. Sabathier ◽  
G. Carlot ◽  
T. Sauvage ◽  
...  
Keyword(s):  
Grain Boundaries ◽  
Uranium Dioxide ◽  
Free Surfaces

scholarly journals An analytical calculation of neighbourhood order probabilities for high dimensional Poissonian processes and mean field models

2007 ◽  
Vol 40 (9) ◽  
pp. 1981-1989 ◽  
Author(s):  
César Augusto Sangaletti Terçariol ◽  
Felipe de Moura Kiipper ◽  
Alexandre Souto Martinez
Keyword(s):  
Mean Field ◽  
Analytical Calculation ◽  
High Dimensional ◽  
Mean Field Models

INTERFACIAL SEGREGATION IN α-IRON

1993 ◽  
Vol 07 (01n03) ◽  
pp. 528-533 ◽  
Author(s):  
PAVEL LEJČEK
Keyword(s):  
Grain Boundaries ◽  
Alloy Composition ◽  
Solute Segregation ◽  
Silicon Nitrides ◽  
Free Surfaces ◽  
Si Model ◽  
Interfacial Segregation

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.

The occurrence of dislocation-free zones at grain boundaries and free surfaces during cyclic deformation

1987 ◽  
Vol 89 ◽  
pp. L31-L34 ◽  
Author(s):  
J.I. Dickson ◽  
S. Turenne ◽  
Hong Bande ◽  
G. L'Espérance
Keyword(s):  
Grain Boundaries ◽  
Cyclic Deformation ◽  
Free Surfaces

Correlation between structure, energy, and ideal cleavage fracture for symmetrical grain boundaries in fcc metals

1990 ◽  
Vol 5 (8) ◽  
pp. 1708-1730 ◽  
Author(s):  
D. Wolf
Keyword(s):  
Phase Space ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Cleavage Fracture ◽  
Good Description ◽  
Random Boundary ◽  
Free Surfaces ◽  
Symmetrical Tilt ◽  
Boundary Model ◽  
Twist Boundaries

The misorientation phase space for symmetrical grain boundaries is explored by means of atomistic computer simulations, and the relationship between the tilt and twist boundaries in this three-parameter phase space is clucidated. The so-called random-boundary model (in which the interactions of atoms across the interface are assumed to be entirely random) is further developed to include relaxation of the interplanar spacings away from the grain boundary. This model is shown to include fully relaxed free surfaces naturally, thus permitting a direct comparison of the physical properties of grain boundaries and free surfaces, and hence the determination of ideal cleavage-fracture energies of grain boundaries. An extensive comparison with computer-simulation results for symmetrical tilt and twist boundaries shows that the random-boundary model also provides a good description of the overall structure-energy correlation for both low- and high-angle tilt and twist boundaries. Finally, the role of the interplanar spacing parallel to the grain boundary in both the grain-boundary and cleavage-fracture energies is elucidated.

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