Coincidence Doppler broadening spectroscopy in Fe, Fe–C and Fe–Cu after neutron irradiation

Verheyen, Kris; Jardin, M.; Almazouzi, A.

doi:10.1016/j.jnucmat.2006.02.011

Cited by 36 publications

(35 citation statements)

References 16 publications

(17 reference statements)

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“…The irradiation-induced hardening depends strongly on the materialcomposition as it is described in [8]. The effect of carbon on the dislocation loops during deformation is visible.…”

Section: Resultsmentioning

confidence: 91%

“…The CDB-measurements have been performed as described by K. Verheyen et al [8]. The analysis of the results have been made using CDB-ratio curves, obtained by normalizing the momentum distribution to the one of unirradiated defect-free pure Fe.…”

Section: Coincidence Doppler Broadening Measurementsmentioning

confidence: 99%

“…Within this paper, the results obtained from the PAS-investigations of different neutron-irradiated Fe and Fe-Cu alloys are described and discussed, in relation to the irradiation induced hardening data obtained from the same samples [8].…”

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confidence: 99%

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Positron annihilation study of neutron irradiated pure Fe and Fe‐Cu binary alloys

Lambrecht¹,

Jardin²,

Almazouzi³

2007

Phys. Status Solidi (c)

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The hardening and embrittlement of Reactor Pressure Vessel (RPV) steels is of great concern in the actual nuclear power plant life assessment. This embrittlement is caused by irradiation-induced damage, like vacancies, interstitials, solutes and their clusters. Fe-Cu binary alloys are often used to mimic the behaviour of such steels. Their study allows identifying some of the defects responsible of the hardening, especially when compared to pure iron or C-micro-alloyed iron. Owing to their self-seeking and selective trapping, positrons are used to determine the nature of these defects. Recently, at SCK·CEN, a new Positron Annihilation Spectroscopy (PAS) setup has been built, calibrated and optimized to measure the Coincidence Doppler Broadening (CDB) and Lifetime (LT) of neutron irradiated materials. This set-up has been used to measure the CDB and LT of n-irradiated pure Fe and Fe-Cu alloys. It is found that the clustering of Cu take place at the very early stages of irradiation using the CDB while LT measurement are showing much more vacancy clustering for low Cu alloys than in the higher ones. Increasing the neutron dose up to 1.3 × 10 20 n/m 2 , allows the follow up of the kinetic of Cu and V-clustering especially in Fe-Cu alloys. It is found that both copper and carbon decrease the size of vacancy-cluster, when added to iron.

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“…The irradiation-induced hardening depends strongly on the materialcomposition as it is described in [8]. The effect of carbon on the dislocation loops during deformation is visible.…”

Section: Resultsmentioning

confidence: 91%

Section: Coincidence Doppler Broadening Measurementsmentioning

confidence: 99%

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Positron annihilation study of neutron irradiated pure Fe and Fe‐Cu binary alloys

Lambrecht¹,

Jardin²,

Almazouzi³

2007

Phys. Status Solidi (c)

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“…The Fe-1%Cu alloy is prepared by argon-arc melting a low carbon steel in air, and adding the corresponding weight percent of pure copper. The details of the sample preparation are published elsewhere [23,24,25]. The chemical composition of the material used in this study is given in table 1.…”

Section: Methodsmentioning

confidence: 99%

Magnetic after-effect study of dislocation relaxation in Fe-based alloys

Minov¹,

Dupré²,

Konstantinović³

2011

J. Phys. D: Appl. Phys.

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To cite this version:B Minov, L Dupré, M J Konstantinović. Magnetic after-effect study of dislocation relaxation in Fe-based alloys. Journal of Physics D: Applied Physics, IOP Publishing, 2011, 44 (30) Abstract. Dislocation-related relaxation processes are studied by measuring the magnetic after-effect spectra as a function of temperature in a variety of non-deformed and cold-worked iron alloys. In the α-Fe and Fe-1%Cu alloys the peak centered at about 320 K appears as a consequence of plastic deformation. On the basis of the behavior of its parameters, such as the temperature position of the peak, the full width at half maximum, and the integrated intensities, this feature is assigned to the relaxation process of thermally-activated dislocation motion.

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“…The CDB spectra were measured using two Ge detectors. Details of the setup are described elsewhere [8].…”

Section: Materials Preparation and Experimental Techniquementioning

confidence: 99%

Effect of the Initial Microstructure on Defect Evolution in Neutron Irradiated Fe-Cr-C Alloys

et al. 2017

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The irradiation-induced evolution of vacancy type defects in various iron-chromium model alloys and high chromium ferritic/martensitic steels have been studied using coincidence Doppler broadening spectroscopy. Specimens were neutron irradiated to 0.11 dpa at two different temperatures, 290• C and 450• C. It has been found that the microstructure (ferrite vs. ferrite/martensite), more precisely distribution of dissolved carbon within the matrix, is one of the key factor that affect response of the materials to neutron irradiation. Presence of dissolved carbon within the matrix leads to formation of stable and immobile carbon-vacancy complexes which act as traps for irradiation induced vacancies and therefore, leading to increased formation of vacancy clusters. Impact of carbon-vacancy complexes on defects evolution during neutron irradiation is relevant only for certain irradiation temperatures.

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Coincidence Doppler broadening spectroscopy in Fe, Fe–C and Fe–Cu after neutron irradiation

Cited by 36 publications

References 16 publications

Positron annihilation study of neutron irradiated pure Fe and Fe‐Cu binary alloys

Positron annihilation study of neutron irradiated pure Fe and Fe‐Cu binary alloys

Magnetic after-effect study of dislocation relaxation in Fe-based alloys

Effect of the Initial Microstructure on Defect Evolution in Neutron Irradiated Fe-Cr-C Alloys

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