Point defect sink strengths and void-swelling

Brailsford, A.D.; Bullough, R.; Hayns, M.R.

doi:10.1016/0022-3115(76)90139-2

Cited by 162 publications

(37 citation statements)

References 7 publications

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“…The lack of understanding of void formation behaviour at the atomic scale has adversely affected the development of advanced theoretical models to predict void evolution under irradiation. This is evidenced by the fact that existing models [27][28][29][30][31][32][33][34][35][36][37] cannot accurately predict the void evolution at the atomic level that is experimentally observed in the current study. Specifically, it is observed here that the void formation is largely controlled by the atomic process on the void surfaces, a phenomenon that has not been reported before and can only be observed in situ at atomic scale.…”

mentioning

confidence: 57%

In-situ atomic-scale observation of irradiation-induced void formation

et al. 2013

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The formation of voids in an irradiated material significantly degrades its physical and mechanical properties. Void nucleation and growth involve discrete atomic-scale processes that, unfortunately, are not yet well understood due to the lack of direct experimental examination. Here we report an in-situ atomic-scale observation of the nucleation and growth of voids in hexagonal close-packed magnesium under electron irradiation. The voids are found to first grow into a plate-like shape, followed by a gradual transition to a nearly equiaxial geometry. Using atomistic simulations, we show that the initial growth in length is controlled by slow nucleation kinetics of vacancy layers on basal facets and anisotropic vacancy diffusivity. The subsequent thickness growth is driven by thermodynamics to reduce surface energy. These experiments represent unprecedented resolution and characterization of void nucleation and growth under irradiation, and might help with understanding the irradiation damage of other hexagonal close-packed materials.

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confidence: 57%

In-situ atomic-scale observation of irradiation-induced void formation

et al. 2013

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“…In this purpose, we follow the approach proposed by Brailsford et al [34] and already used by Smetniansky-De-Grande and Barbu in their modeling of the precipitation kinetics in Fe-Cu alloys [35,36]. When calculating the monomer condensation rate on a given cluster, we assume that at distances greater than r ext , one half of the mean distance between precipitates, monomers feel influence of the cluster through its diffusion field as well as the one arising from other clusters through an effective medium characterized by a parameter k. The rate at which this effective medium absorbs monomers is given by D X k 2 (C 1 − C eq 1 ), C 1 and C eq 1 being respectively the instantaneous and the equilibrium monomer concentrations.…”

Section: Effect Of the Overlap Of Diffusion Fieldsmentioning

confidence: 99%

Precipitation kinetics of AlZr and AlSc in aluminum alloys modeled with cluster dynamics

Clouet

Barbu

Laé³

et al. 2005

Acta Materialia

151

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Precipitation kinetics of Al 3 Zr and Al 3 Sc in aluminum supersaturated solid solutions is studied using cluster dynamics, a mesoscopic modeling technique which describes the various stages of homogeneous precipitation by a single set of rate equations. The only parameters needed are the interface free energy and the diffusion coefficient which are deduced from an atomic model previously developed to study the same alloys. A comparison with kinetic Monte Carlo simulations based on the vacancy diffusion mechanism shows that cluster dynamics correctly predicts the precipitation kinetics provided a size dependent interface free energy is used. It also manages to reproduce reasonably well existing experimental data.

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“…This expression, equation 9, is a standard result of rate theory [13]. At large times the result is C(«) = G/DS, a result often used to calculate the concentration when recombination is neglected.…”

Section: Cascade-induced Creepmentioning

confidence: 99%

Cascade Diffusion Theory of Displacement-Induced Point Defect Concentration and Flux Fluctuations

Mansur

Brailsford

Coghlan

1987

MSF

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A theoretical approach, which has been developed to assess the fluctuations in point defect concentrations and fluxes to sinks that are induced by the production of point defects in spatially and temporally discrete cascades, is summarized. Solutions for cascade dissipation are outlined for the case where cascades occur in a homogeneous lossy medium as well as for the more involved geometries where cascades occur in the presence of a nearby dislocation or cavity. By superposition of solutions representing discrete cascades under conditions of interest, time profiles of point defect concentrations and fluxes are generated. The profiles exhibit extreme fluctuations. Continuum rate theory results arise by applying limits and approximations to cascade diffusion theory. Application of the theory to microstructural processes shows that property changes, especially creep are affected by the fluctuations.

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Point defect sink strengths and void-swelling

Cited by 162 publications

References 7 publications

In-situ atomic-scale observation of irradiation-induced void formation

In-situ atomic-scale observation of irradiation-induced void formation

Precipitation kinetics of AlZr and AlSc in aluminum alloys modeled with cluster dynamics

Cascade Diffusion Theory of Displacement-Induced Point Defect Concentration and Flux Fluctuations

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