Irradiation-Induced Solute Clustering in a Low Nickel FeMnNi Ferritic Alloy |
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Authors: | E Meslin B Radiguet P Pareige C Toffolon A Barbu |
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Institution: | 1.Service de Recherches de Métallurgie Physique, CEA/Saclay,Gif-sur-Yvette Cedex,France;2.Groupe de Physique des Matériaux UMR-CNRS 6634, Equipe de Recherche Technologique No. 1000,Université de Rouen,Saint Etienne du Rouvray,France;3.Service de Recherches en Métallurgie Appliquée, CEA/Saclay,Gif-sur-Yvette Cedex,France |
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Abstract: | Understanding the radiation embrittlement of reactor pressure vessel (RPV) steels is required to be able to operate safely
a nuclear power plant or to extend its lifetime. The mechanical properties degradation is partly due to the clustering of
solute under irradiation. To gain knowledge about the clustering process, a Fe−1.1 Mn−0.7 Ni (at.%) alloy was irradiated in
a test reactor at two fluxes of 0.15 and 9 ×1017 n
E > 1MeV
.m − 2.s − 1 and at increasing doses from 0.18 to 1.3 ×1024 n
E > 1MeV
.m − 2 at 300°C. Atom probe tomography (APT) experiments revealed that the irradiation promotes the formation in the α iron matrix of Mn/Mn and/or Ni/Ni pair correlations at low dose and Mn–Ni enriched clusters at high dose. These clusters
dissolve partially after a thermal treatment at 400°C. Based on a comparison with thermodynamic calculations, we show that
the solute clustering under irradiation can just result from an induced mechanism. |
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Keywords: | |
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