Multiscale modeling of the effects of temperature, radiation flux, and sink strength on point-defect and solute redistribution in dilute Fe-based alloys

This work focuses on a mathematical modeling of the response to irradiation of a multilayer composite material. Nonstationary balance equations are utilized to account for production, recombination, transport, and annihilation, or removal, of vacancies and interstitials at interfaces. Although the model developed has general validity, Cu/Nb multilayers are used as case study. Layer thickness, temperature, radiation intensity, and surface recombination coefficients were varied systematically to investigate their effect on point defect annihilation processes at interfaces. It is shown that point defect annihilation at interfaces mostly depends on point defect diffusion. The ability of interfaces to remove point defects can be described by a simple map constructed using only two dimensionless parameters, which provides a general tool to estimate the efficiency of vacancy and interstitial removal in multilayer composite materials.

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Lattice Green's Function for Multiscale Modeling of Strain Field Due to a Vacancy or Other Point Defects in Graphene

MRS Advances ◽

10.1557/adv.2020.326 ◽

2020 ◽

Vol 5 (52-53) ◽

pp. 2717-2725

Author(s):

V.K. Tewary ◽

E.J. Garboczi

Keyword(s):

Green’S Function ◽

Point Defect ◽

Multiscale Modeling ◽

Green's Function ◽

Point Defects ◽

Strain Field ◽

Function Method ◽

2D Materials ◽

Dyson Equation ◽

Other Point Defects

AbstractA multiscale Green's function method, based upon a solution of the Dyson equation, is described for modeling the strain field due to a vacancy or any other point defect in graphene and other 2D materials. Numerical results are presented using a fourth-neighbor force-constant model for the purpose of illustration.

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Calculations of sink strength and bias for point-defect absorption by dislocations in arrays

Radiation Effects ◽

10.1080/00337578108210044 ◽

1981 ◽

Vol 54 (3-4) ◽

pp. 169-176 ◽

Cited By ~ 13

Author(s):

A. H. King ◽

D. A. Smith

Keyword(s):

Point Defect ◽

Sink Strength

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Multiscale modeling of plastic deformation of molybdenum and tungsten. III. Effects of temperature and plastic strain rate

Acta Materialia ◽

10.1016/j.actamat.2008.07.027 ◽

2008 ◽

Vol 56 (19) ◽

pp. 5426-5439 ◽

Cited By ~ 69

Author(s):

R. Gröger ◽

V. Vitek

Keyword(s):

Plastic Deformation ◽

Plastic Strain ◽

Strain Rate ◽

Multiscale Modeling ◽

Plastic Strain Rate ◽

Effects Of Temperature ◽

And Tungsten

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The effects of temperature, radiation, and illumination on current-voltage characteristics of Au/PVA(Co, Zn-doped)/n-Si Schottky diodes

Journal of Applied Polymer Science ◽

10.1002/app.36327 ◽

2012 ◽

Vol 125 (2) ◽

pp. 1185-1192 ◽

Cited By ~ 15

Author(s):

İlbilge Dökme ◽

Şemsettin Altindal ◽

İbrahim Uslu

Keyword(s):

Schottky Diodes ◽

Current Voltage ◽

Current Voltage Characteristics ◽

Effects Of Temperature ◽

Temperature Radiation

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Mechanisms of the electron irradiation-induced amorphous transition in intermetallic compounds

Journal of Materials Research ◽

10.1557/jmr.1986.0425 ◽

1986 ◽

Vol 1 (3) ◽

pp. 425-441 ◽

Cited By ~ 65

Author(s):

D.F. Pedraza

Keyword(s):

Point Defect ◽

Intermetallic Compounds ◽

Point Defects ◽

Tini Alloy ◽

Sink Strength ◽

Lattice Instability ◽

Temperature Dependent ◽

Defect Production ◽

Theoretical Predictions ◽

Radiation Induced

A buildup of radiation-induced lattice defects is proposed as the cause for lattice instability that can give rise to a crystalline-to-amorphous transition. An analysis of published experiments on intermetallic compounds suggests that, when amorphization takes place, no microstructural evolution based on the aggregation of like-point defects occurs. This observation leads us to suggest that buildup of a different type of defect, which will destabilize the crystal, should occur. We thus propose that an interstitial and a vacancy may form a complex, giving rise to a relaxed configuration exhibiting a sort of short-range order. Two mechanisms of complex formation are analyzed, one diffusionless (limited by the point defect production rate) and the other temperature dependent. The amorphization kinetics as a function of temperature, dose, and point defect sink strength are studied. Theoretical predictions on the amorphization dose as a function of temperature are made for the equiatomic TiNi alloy and compared with available experimental results.

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