General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DES-24-0109
Thesis topic details
Category
Condensed Matter Physics, chemistry, nanosciences
Thesis topics
Study of segregation induced by irradiation at the grain boundary in austenitic model alloys
Contract
Thèse
Job description
Structural steels of nuclear plants of both generation II/III and future generation IV, are exposed to high neutrons flux which can lead to macroscopic mechanic property degradation. These steels have complex microstructure and many alloying elements. Thus, identification of the mechanism responsible for macroscopic evolution are difficult. That’s why, binary model alloys are often used to understand the complex behavior of structural steels under irradiation. In fact, degradation of the macroscopic properties is the result of nanoscale mechanisms located both in and at the borders of the grains. Especially, the radiation-induced segregation can locally modify the chemical composition of the interfaces and cause evolution, sometimes harmful, of the macroscopic properties.
The proposed study aims at experimentally characterize the irradiations effects of charged particles (ions-electrons) on the grain boundary segregation in binary austenitic alloys. Chemical and crystallographic characterizations of the grain boundary will be made by different methods (EBSD, TKD, SAT). The investigation will be made on both massive materials and bi-crystals with well-defined crystallographic orientation. The obtained experimental results will be compared to Monte Carlo simulations done in a CEA Saclay lab (SRMP).
We are looking for an engineer with practical skills and who want to work in an experimental field. The PhD formation will allow the futur candidate to become researcher and thus contribute to the devleoppment of futur energies.
An internship of 6 month is proposed before the PhD.
University / doctoral school
Sciences de la Matière, du Rayonnement et de l’Environnement (SMRE)
Lille I
Thesis topic location
Site
Saclay
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
TISSOT Olivier olivier.tissot@cea.fr
CEA
DES/DMN/SRMA/LA2M
CEA Saclay, Bâtiment 453, DEN/DMN/SRMA/LA2M
01 69 08 54 45
Tutor / Responsible thesis director
THUINET Ludovic ludovic.thuinet@univ-lille.fr
CNRS
UMET, Université de Lille1
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