Synthesis of atom probe experiments on irradiation-induced solute segregation in French ferritic pressure vessel steels

Auger, Pierre; Pareige, P.; Welzel, S.; Duysen, JC Van

doi:10.1016/s0022-3115(00)00056-8

Cited by 119 publications

(88 citation statements)

References 20 publications

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“…3 and 4 [11]. At high doses and high copper contents, well-defined clusters are observed and can be analyzed in terms of size, composition, and number density.…”

Section: Copper-enriched Precipitatesmentioning

confidence: 99%

“…Systematic measurements of the composition of the matrix after exposure to neutron irradiation and annealing treatments have been obtained from several different types of pressure vessel steels [9][10][11][12]. These measurements accurately reflect the true solute content of the matrix since the spatial resolution of the atom probe is sufficient to detect and eliminate any contributions from ultra-fine precipitates, clusters and solute segregation.…”

Section: Matrix Compositionsmentioning

confidence: 99%

“…Neutron irradiation to a fluence of 1.1 x 10 23 n m -2 (E > 1 MeV) further reduces the copper matrix level to a level of ~0.05 at. % Cu and forms a high number density of copper-enriched precipitates in the matrix [10,11]. This low copper level has been observed in a number of different types of RPV steels.…”

Section: Matrix Compositionsmentioning

confidence: 99%

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Atomic Level Characterization of Neutron Irradiated Pressure Vessel Steels

Miller

Pareige

2000

MRS Proc.

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Atom probe tomography provides one of the most effective tools to characterize the solute distribution and precipitation that occurs in pressure vessel steels and associated model alloys during irradiation. The three-dimensional atom probe is able to experimentally determine the elemental identities of the atoms and their spatial coordinates with near atomic resolution so that their distribution within small volumes of the specimen can be reconstructed and analyzed. This technique together with conventional atom probe field ion microscopy has been applied to many different types of pressure vessel steels and model alloys and has revealed and characterized several different nanostructural transformations. These radiation induced or enhanced processes lead to the formation of copper-nickel-manganese-silicon precipitates, and solute segregation to dislocations, dislocation loops, nanovoids and boundaries.

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“…3 and 4 [11]. At high doses and high copper contents, well-defined clusters are observed and can be analyzed in terms of size, composition, and number density.…”

Section: Copper-enriched Precipitatesmentioning

confidence: 99%

Section: Matrix Compositionsmentioning

confidence: 99%

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Atomic Level Characterization of Neutron Irradiated Pressure Vessel Steels

Miller

Pareige

2000

MRS Proc.

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“…1 The point defects created by the neutron induced cascades are responsible for the diffusion of the solute atoms, leading to the formation of solute rich precipitates within the matrix. These clusters are enriched in Cu, Ni, Mn, Si, and P. 2,3 The presence of solute atoms also influences the formation of point defect clusters. Both the change in point defect clusters and the formation of solute rich clusters influence the mechanical properties of the steels.…”

Section: Introductionmentioning

confidence: 99%

Ab initiostudy of solute transition-metal interactions with point defects in bcc Fe

Olsson

Klaver²,

Domain³

2010

Phys. Rev. B

205

150

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The properties of 3d, 4d, and 5d transition-metal elements in ␣-Fe have been studied using ab initio density-functional theory. The intrinsic properties of the solutes have been characterized as well as their interaction with point defects. Vacancies and interstitials of ͗110͘ and ͗111͘ orientations have been considered in order to discern trends that may explain experimental evidence of solute influences on radiation response and possibly aid future material design regarding the choice of alloy composition. Depending on the solute element, the different interactions are governed by the chemical interactions and the solute size factor. It is shown that magnetic interactions play an important role for the properties of the center series 3d elements, especially so for the antiferromagnetically coupling V, Cr, and Mn. For the 4d, 5d, and remaining 3d elements the interaction with point defects is mainly governed by the solute size factor. The solute-solute interaction is mostly repulsive with a few exceptions. The interactions with vacancies are in most cases binding; but the second nearest neighbor configurations exhibit strong repulsion for the early transition metals. Cr and Mn interact strongly binding with interstitial defects. The trends of the solute defect interactions have been determined to depend on the characteristic local deformation. Early transition metals interact stronger with defects than late ones of equal size factor.

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“…[6][7][8][9][10][11] Detailed measurements based on atom-probe microscopy yield precipitate compositions that include substantial amounts of dissolved Fe in binary Fe-Cu alloys, 6,12 as well as a number of other solute species in commercial multicomponent steels. 13,14 The pronounced effect of bcc-Cu precipitates on the mechanical properties of ␣-Fe provides strong motivation for characterizing the structural, thermodynamic, and elastic properties of bcc Fe-Cu solid solutions. Of specific interest are the thermodynamic properties of mixing, which provide the driving force for precipitate nucleation, and the composition dependencies of the atomic volume and elastic moduli that influence dislocation-precipitate interactions.…”

Section: Introductionmentioning

confidence: 99%

Structure, energetics, and mechanical stability of Fe-Cu bcc alloys from first-principles calculations

et al. 2005

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Atomic volumes, magnetic moments, mixing energies, and the elastic properties of bcc Fe 1−x Cu x solid solutions are studied by ab initio calculations based on the cluster expansion framework. For the calculation of concentration-dependent elastic moduli in disordered solid solutions, we introduce a generalization of the cluster expansion technique that is designed to handle tensorial quantities in high-symmetry phases. Calculated mixing energies, atomic volumes, and magnetic moments are found to be in good agreement with available measurements for metastable alloys prepared through nonequilibrium processing techniques. Additionally, the predicted variations of the bulk modulus and shear moduli C 44 and CЈ with respect to copper concentration are calculated for the disordered bcc phase. While the bulk modulus and C 44 are positive for all concentrations, CЈ is predicted to be positive only for Cu concentration less than 50 atomic %, and negative otherwise. Our results thus indicate that the mechanical instability of bcc Cu persists over a wide range of compositions. The implications of the present results are discussed in relation to the observed metastability of bcc Fe-Cu alloys, and the strengthening mechanism of nanoscale bcc precipitates in an ␣-Fe matrix.

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Synthesis of atom probe experiments on irradiation-induced solute segregation in French ferritic pressure vessel steels

Cited by 119 publications

References 20 publications

Atomic Level Characterization of Neutron Irradiated Pressure Vessel Steels

Atomic Level Characterization of Neutron Irradiated Pressure Vessel Steels

Ab initiostudy of solute transition-metal interactions with point defects in bcc Fe

Structure, energetics, and mechanical stability of Fe-Cu bcc alloys from first-principles calculations

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