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-24-0120
Thesis topic details
Category
Miscellaneous
Thesis topics
Study of restructuring phenomena in UO2 fuel using High Resolution Electron Back Scatter Diffraction
Contract
Thèse
Job description
Electron BackScatter Diffraction (EBSD) has helped to highlight microstructural changes in UO2 fuel pellets, such as the subdivision of grains into weakly disoriented sub-grains, either after compression tests at high temperature or after irradiation. However, the analyses carried out to date by this method present several limitations.
The main objective of this thesis is to improve their angular and spatial resolution. To this end, high-resolution EBSD (HR-EBSD) and Transmission Kikuchi Diffraction (HR-TKD) will be developed and applied to different restructured fuels. The new data acquired by these methods will improve our knowledge of the defect population (dislocations) and the local mechanical state of the fuel. They will be used in crystalline plasticity models.
This subject will enable the PhD student to acquire skills in advanced microstructural characterisation of materials, exploitation of experimental data and micromechanical modelling, which will be applicable to a wide range of materials.
The thesis work will mainly take place at the Fuel Research Department (IRESNE INstitute, CEA Cadarache) in a laboratory for the characterisation and study of the properties of fresh and irradiated fuels. It will also take place over a shorter period of time at the LEM3 laboratory of the University of Loraine based in Metz, which supervises this thesis in collaboration with the CEA and which has internationally recognized experience in the characterization of materials using the considered techniques in this study.
University / doctoral school
Chimie Mécanique Matériaux Physique (C2MP)
Université de Lorraine
Thesis topic location
Site
Cadarache
Requester
Position start date
01/10/2024
Person to be contacted by the applicant
ZACHARIE AUBRUN Isabelle isabelle.aubrun@cea.fr
CEA
DES/DEC
CEA Cadarache
Bat 316
13108 Saint Paul les Durance
0442252005
Tutor / Responsible thesis director
Taupin vincent vincent.taupin@univ-lorraine.fr
CNRS
UMR CNRS 7239 université de Lorraine
Laboratoire LEM3, UMR CNRS 7239, Université de Lorraine, 57073 Metz Cedex 3, France
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