Positron annihilation in neutron irradiated iron-based materials

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Positron annihilation in neutron irradiated iron-based materials. / Lambrecht, Marlies; Al Mazouzi, Abderrahim; Malerba, Lorenzo (Peer reviewer).

In: Journal of Physics: Conference Series, Vol. 265, No. 1, 01.2011, p. 012009-012009.

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Lambrecht, Marlies ; Al Mazouzi, Abderrahim ; Malerba, Lorenzo. / Positron annihilation in neutron irradiated iron-based materials. In: Journal of Physics: Conference Series. 2011 ; Vol. 265, No. 1. pp. 012009-012009.

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@article{8c8c96364c2b4673b17e54848ff4b865,
title = "Positron annihilation in neutron irradiated iron-based materials",
abstract = "The hardening and embrittlement of reactor pressure vessel steels is of great concern in the actual nuclear power plant life assessment. This embrittlement is caused by irradiation-induced damage. But the reason for the embrittlement of the material is not yet totally known. The real nature of the irradiation damage should thus be examined as well as its evolution in time. Positron annihilation spectroscopy has been shown to be a powerful method for analyzing some of these defects. In fact, both vacancy type clusters and precipitates can be visualized by positrons. To be able to compare the results obtained by the positron studies, with those of other techniques (such as transmission electron microscopy, atom probe tomography and small angle neutron scattering), quantitative estimations of the size and density of the annihilation sites are needed. Using the approach proposed by Vehanen et al., an attempt is made to calculate the needed quantities in Fe and Fe-Cu binary alloys that were neutron irradiated to different doses. The results obtained are discussed highlighting the difficulties in defining the annihilation centres even in these simple model alloys, in spite of using both lifetime and Doppler broadening measurements in the same samples.",
keywords = "Neutron radiation effects, Embrittlement, Structural materials, Metals and alloys, Positron annihilation",
author = "Marlies Lambrecht and {Al Mazouzi}, Abderrahim and Lorenzo Malerba",
note = "Score = 10",
year = "2011",
month = "1",
doi = "10.1088/1742-6596/265/1/012009",
language = "English",
volume = "265",
pages = "012009--012009",
journal = "Journal of Physics: Conference Series",
issn = "1742-6588",
publisher = "IOP - IOP Publishing",
number = "1",

}

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TY - JOUR

T1 - Positron annihilation in neutron irradiated iron-based materials

AU - Lambrecht, Marlies

AU - Al Mazouzi, Abderrahim

A2 - Malerba, Lorenzo

N1 - Score = 10

PY - 2011/1

Y1 - 2011/1

N2 - The hardening and embrittlement of reactor pressure vessel steels is of great concern in the actual nuclear power plant life assessment. This embrittlement is caused by irradiation-induced damage. But the reason for the embrittlement of the material is not yet totally known. The real nature of the irradiation damage should thus be examined as well as its evolution in time. Positron annihilation spectroscopy has been shown to be a powerful method for analyzing some of these defects. In fact, both vacancy type clusters and precipitates can be visualized by positrons. To be able to compare the results obtained by the positron studies, with those of other techniques (such as transmission electron microscopy, atom probe tomography and small angle neutron scattering), quantitative estimations of the size and density of the annihilation sites are needed. Using the approach proposed by Vehanen et al., an attempt is made to calculate the needed quantities in Fe and Fe-Cu binary alloys that were neutron irradiated to different doses. The results obtained are discussed highlighting the difficulties in defining the annihilation centres even in these simple model alloys, in spite of using both lifetime and Doppler broadening measurements in the same samples.

AB - The hardening and embrittlement of reactor pressure vessel steels is of great concern in the actual nuclear power plant life assessment. This embrittlement is caused by irradiation-induced damage. But the reason for the embrittlement of the material is not yet totally known. The real nature of the irradiation damage should thus be examined as well as its evolution in time. Positron annihilation spectroscopy has been shown to be a powerful method for analyzing some of these defects. In fact, both vacancy type clusters and precipitates can be visualized by positrons. To be able to compare the results obtained by the positron studies, with those of other techniques (such as transmission electron microscopy, atom probe tomography and small angle neutron scattering), quantitative estimations of the size and density of the annihilation sites are needed. Using the approach proposed by Vehanen et al., an attempt is made to calculate the needed quantities in Fe and Fe-Cu binary alloys that were neutron irradiated to different doses. The results obtained are discussed highlighting the difficulties in defining the annihilation centres even in these simple model alloys, in spite of using both lifetime and Doppler broadening measurements in the same samples.

KW - Neutron radiation effects

KW - Embrittlement

KW - Structural materials

KW - Metals and alloys

KW - Positron annihilation

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_110914

UR - http://knowledgecentre.sckcen.be/so2/bibref/7657

U2 - 10.1088/1742-6596/265/1/012009

DO - 10.1088/1742-6596/265/1/012009

M3 - Article

VL - 265

SP - 12009

EP - 12009

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 1

ER -

ID: 274899