Q3680906 (Q3680906): Difference between revisions
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(Created claim: summary (P836): Under the action of an intense static electric field, the surface of any material can spontaneously lose its cohesion by the expulsion of its constituents in the form of ions. This phenomenon called field effect evaporation is the basic physical principle exploited by the tomographic atomic probe, a quantitative nanoanalysis technique. The instrument, which is one of the strong points of LABEX EMC3 as a method of characterisation, is used to fin...) |
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Under the action of an intense static electric field, the surface of any material can spontaneously lose its cohesion by the expulsion of its constituents in the form of ions. This phenomenon called field effect evaporation is the basic physical principle exploited by the tomographic atomic probe, a quantitative nanoanalysis technique. The instrument, which is one of the strong points of LABEX EMC3 as a method of characterisation, is used to finely analyse nuclear materials. Indeed, structural materials in the electrical nuclear industry age under the influence of temperature, neutron bombardment produced by fission reactions and under the influence of the surrounding environment. From a macroscopic point of view, this ageing usually results in a degradation of the use properties (hardening, weakening, corrosion awareness...) which can limit the life of the reactors. This evolution of properties is due to changes in the microstructure: agglomeration of spot defects in the form of dislocation loops or cavities, segregation of solutes on these extended defects, grain joints and interfaces, formation of clusters of solutes, precipitation of new phases... Today, the atomic probe remains one of the only analytical techniques capable of finely characterise nanometric chemical heterogeneities within a material and to measure the chemical composition of the matrix in complex structures such as low-alloy steels. It is therefore essential in the study of the aging of nuclear materials.The data provided by this technique makes it possible to identify the mechanisms of thermal aging or under irradiation and, in a multi-scale approach, serve as a starting point for models predicting the evolution of macroscopic properties. It is therefore essential to identify the limitations of this technique and to determine to what extent the results provided are true to reality. Moreover, while the atomic probe provides much information on chemical heterogeneities, it does not allow direct observation of extended defects. However, the emergence of these surface defects during field effect evaporation can alter the surface of the sample and influence three-dimensional reconstructions. It is therefore important to understand how such defects behave under field on the surface of the sample.The proposed project is part of the SRI-SI process, whose aging of materials under irradiation is a major point in the fields of specialisation in Normandy.In order to understand the limits of the instrument in terms of spatial resolution and reliability of composition measurements, the wearer proposes to develop a novel multi-physical theoretical method: the application of molecular dynamics on the surface of a material subjected to an intense electric field. The technique is mature to give a fine and physical interpretation of the changes in the surface under the effect of the intense field necessary for the technique. (English) | |||||||||||||||
| Property / summary: Under the action of an intense static electric field, the surface of any material can spontaneously lose its cohesion by the expulsion of its constituents in the form of ions. This phenomenon called field effect evaporation is the basic physical principle exploited by the tomographic atomic probe, a quantitative nanoanalysis technique. The instrument, which is one of the strong points of LABEX EMC3 as a method of characterisation, is used to finely analyse nuclear materials. Indeed, structural materials in the electrical nuclear industry age under the influence of temperature, neutron bombardment produced by fission reactions and under the influence of the surrounding environment. From a macroscopic point of view, this ageing usually results in a degradation of the use properties (hardening, weakening, corrosion awareness...) which can limit the life of the reactors. This evolution of properties is due to changes in the microstructure: agglomeration of spot defects in the form of dislocation loops or cavities, segregation of solutes on these extended defects, grain joints and interfaces, formation of clusters of solutes, precipitation of new phases... Today, the atomic probe remains one of the only analytical techniques capable of finely characterise nanometric chemical heterogeneities within a material and to measure the chemical composition of the matrix in complex structures such as low-alloy steels. It is therefore essential in the study of the aging of nuclear materials.The data provided by this technique makes it possible to identify the mechanisms of thermal aging or under irradiation and, in a multi-scale approach, serve as a starting point for models predicting the evolution of macroscopic properties. It is therefore essential to identify the limitations of this technique and to determine to what extent the results provided are true to reality. Moreover, while the atomic probe provides much information on chemical heterogeneities, it does not allow direct observation of extended defects. However, the emergence of these surface defects during field effect evaporation can alter the surface of the sample and influence three-dimensional reconstructions. It is therefore important to understand how such defects behave under field on the surface of the sample.The proposed project is part of the SRI-SI process, whose aging of materials under irradiation is a major point in the fields of specialisation in Normandy.In order to understand the limits of the instrument in terms of spatial resolution and reliability of composition measurements, the wearer proposes to develop a novel multi-physical theoretical method: the application of molecular dynamics on the surface of a material subjected to an intense electric field. The technique is mature to give a fine and physical interpretation of the changes in the surface under the effect of the intense field necessary for the technique. (English) / rank | |||||||||||||||
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| Property / summary: Under the action of an intense static electric field, the surface of any material can spontaneously lose its cohesion by the expulsion of its constituents in the form of ions. This phenomenon called field effect evaporation is the basic physical principle exploited by the tomographic atomic probe, a quantitative nanoanalysis technique. The instrument, which is one of the strong points of LABEX EMC3 as a method of characterisation, is used to finely analyse nuclear materials. Indeed, structural materials in the electrical nuclear industry age under the influence of temperature, neutron bombardment produced by fission reactions and under the influence of the surrounding environment. From a macroscopic point of view, this ageing usually results in a degradation of the use properties (hardening, weakening, corrosion awareness...) which can limit the life of the reactors. This evolution of properties is due to changes in the microstructure: agglomeration of spot defects in the form of dislocation loops or cavities, segregation of solutes on these extended defects, grain joints and interfaces, formation of clusters of solutes, precipitation of new phases... Today, the atomic probe remains one of the only analytical techniques capable of finely characterise nanometric chemical heterogeneities within a material and to measure the chemical composition of the matrix in complex structures such as low-alloy steels. It is therefore essential in the study of the aging of nuclear materials.The data provided by this technique makes it possible to identify the mechanisms of thermal aging or under irradiation and, in a multi-scale approach, serve as a starting point for models predicting the evolution of macroscopic properties. It is therefore essential to identify the limitations of this technique and to determine to what extent the results provided are true to reality. Moreover, while the atomic probe provides much information on chemical heterogeneities, it does not allow direct observation of extended defects. However, the emergence of these surface defects during field effect evaporation can alter the surface of the sample and influence three-dimensional reconstructions. It is therefore important to understand how such defects behave under field on the surface of the sample.The proposed project is part of the SRI-SI process, whose aging of materials under irradiation is a major point in the fields of specialisation in Normandy.In order to understand the limits of the instrument in terms of spatial resolution and reliability of composition measurements, the wearer proposes to develop a novel multi-physical theoretical method: the application of molecular dynamics on the surface of a material subjected to an intense electric field. The technique is mature to give a fine and physical interpretation of the changes in the surface under the effect of the intense field necessary for the technique. (English) / qualifier | |||||||||||||||
point in time: 18 November 2021
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Revision as of 18:11, 18 November 2021
Project Q3680906 in France
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | No label defined |
Project Q3680906 in France |
Statements
108,951.10 Euro
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231,963.49 Euro
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46.97 percent
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31 January 2020
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CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
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49°12'0.97"N, 0°20'57.37"W
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14052
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Sous l'action d'un champ électrique statique intense, la surface de n'importe quel matériau peut perdre spontanément sa cohésion par l'expulsion de ses constituants sous forme d'ions. Ce phénomène appelé évaporation par effet de champ est le principe physique de base exploité par la sonde atomique tomographique, technique de nano-analyse quantitative. L'instrument qui est l'un des points fort du LABEX EMC3 comme méthode de caractérisation est utilisé notamment pour analyser finement les matériaux du nucléaire.En effet les matériaux de structure de l'industrie du nucléaire électrique vieillissent sous l'effet de la température, du bombardement par les neutrons produits par les réactions de fission et sous l'effet du milieu environnant. Du point de vue macroscopique, ce vieillissement se traduit généralement par une dégradation des propriétés d'usage (durcissement, fragilisation, sensibilisation à la corrosion...) pouvant limiter la durée de vie des réacteurs. Cette évolution des propriétés est due des modifications de la microstructure : agglomération de défauts ponctuels sous forme de boucles de dislocation ou cle cavités, ségrégation de solutés sur ces défauts étendus, aux joints de grains et interfaces, formation d'amas de solutés, précipitation de nouvelles phases... La sonde atomique reste aujourd'hui l'une des seules techniques d'analyse capables cle caractériser finement des hétérogénéités chimiques nanométriques au sein d'un matériau ainsi que de mesurer la composition chimique de la matrice dans des structures complexes telles que les aciers faiblement alliés. Elle est à ce titre incontournable dans l'étude du vieillissement des matériaux du nucléaire.Les données apportées par cette technique permettent d'identifier de comprendre les mécanismes du vieillissement thermique ou sous irradiation et, dans une approche multi-échelle, servent cie point de départ aux modèles prédisant l'évolution des propriétés macroscopiques. Il est donc essentiel d'identifier les limites cle cette technique et de déterminer dans quelle mesure les résultats fournis sont fidèles à la réalité. Par ailleurs, si la sonde atomique apporte de nombreuses informations sur les hétérogénéités chimiques, elle ne permet pas d'observer directement les défauts étendus. Cependant l'émergence de ces défauts en surface lors de l'évaporation par effet de champ peut modifier la surface de l'échantillon et influencer les reconstructions tridimensionnelles. Il est donc important de comprendre comment de tels défauts se comportent sous champ à la surface de l'échantillon.Le projet proposé s'intègre au processus SRI-SI, dont le vieillissement des matériaux sous irradiation constitue un point majeur des domaines de spécialisation en Normandie,Afin de comprendre les limites de l'instrument en termes de résolution spatiale et de fiabilité des mesures de composition, le porteur propose de développer une méthode théorique inédite multi-physique : l'application de la dynamique moléculaire sur la surface d'un matériau soumis à un champ électrique intense. La technique est mature pour donner une interprétation fine et physique des modifications de la surface sous l'effet du champ intense nécessaire à la technique. (French)
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Under the action of an intense static electric field, the surface of any material can spontaneously lose its cohesion by the expulsion of its constituents in the form of ions. This phenomenon called field effect evaporation is the basic physical principle exploited by the tomographic atomic probe, a quantitative nanoanalysis technique. The instrument, which is one of the strong points of LABEX EMC3 as a method of characterisation, is used to finely analyse nuclear materials. Indeed, structural materials in the electrical nuclear industry age under the influence of temperature, neutron bombardment produced by fission reactions and under the influence of the surrounding environment. From a macroscopic point of view, this ageing usually results in a degradation of the use properties (hardening, weakening, corrosion awareness...) which can limit the life of the reactors. This evolution of properties is due to changes in the microstructure: agglomeration of spot defects in the form of dislocation loops or cavities, segregation of solutes on these extended defects, grain joints and interfaces, formation of clusters of solutes, precipitation of new phases... Today, the atomic probe remains one of the only analytical techniques capable of finely characterise nanometric chemical heterogeneities within a material and to measure the chemical composition of the matrix in complex structures such as low-alloy steels. It is therefore essential in the study of the aging of nuclear materials.The data provided by this technique makes it possible to identify the mechanisms of thermal aging or under irradiation and, in a multi-scale approach, serve as a starting point for models predicting the evolution of macroscopic properties. It is therefore essential to identify the limitations of this technique and to determine to what extent the results provided are true to reality. Moreover, while the atomic probe provides much information on chemical heterogeneities, it does not allow direct observation of extended defects. However, the emergence of these surface defects during field effect evaporation can alter the surface of the sample and influence three-dimensional reconstructions. It is therefore important to understand how such defects behave under field on the surface of the sample.The proposed project is part of the SRI-SI process, whose aging of materials under irradiation is a major point in the fields of specialisation in Normandy.In order to understand the limits of the instrument in terms of spatial resolution and reliability of composition measurements, the wearer proposes to develop a novel multi-physical theoretical method: the application of molecular dynamics on the surface of a material subjected to an intense electric field. The technique is mature to give a fine and physical interpretation of the changes in the surface under the effect of the intense field necessary for the technique. (English)
18 November 2021
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Identifiers
17P04845
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