Le CEA est un acteur majeur de la recherche, au service des citoyens, de l'économie et de l'Etat.
Il apporte des solutions concrètes à leurs besoins dans quatre domaines principaux : transition énergétique, transition numérique, technologies pour la médecine du futur, défense et sécurité sur un socle de recherche fondamentale. Le CEA s'engage depuis plus de 75 ans au service de la souveraineté scientifique, technologique et industrielle de la France et de l'Europe pour un présent et un avenir mieux maîtrisés et plus sûrs.
Implanté au cœur des territoires équipés de très grandes infrastructures de recherche, le CEA dispose d'un large éventail de partenaires académiques et industriels en France, en Europe et à l'international.
Les 20 000 collaboratrices et collaborateurs du CEA partagent trois valeurs fondamentales :
2026-42465
The mission of SRMP is to develop fundamental research knowledge on materials for low-carbon energy technologies (nuclear energy, photovoltaics and energy storage), with a particular focus on the behaviour of materials under irradiation.
This research is driven by practical applications, addressing both the operational lifetime of materials used in current nuclear systems and the development of new materials for future nuclear systems and fusion, as well as renewable energy technologies (photovoltaics and high-energy-density batteries). The materials investigated are most often model materials, ranging from metals and alloys (Fe, Fe-Cr alloys, Fe-Mn alloys, body-centred cubic and face-centred cubic metals, Ni, Fe-Ni, Al, hexagonal metals, Zr and Ti) to ceramics (B4C), oxides (UO2), polymers and other iono-covalent materials, such as hybrid perovskites and silicon-based systems.
These studies, which contribute to the development of a multiscale and multiphysics science, combine numerical simulation with experimental approaches. These include ion irradiation experiments conducted at the Laboratory's JANNuS-Saclay triple-beam facility.
Matériaux, physique du solide
Stage
Stage - Bac+5 H/F
Coupling diffusion and dislocation evolution: towards a better understanding of irradiation creep
6 months
Structural materials used in nuclear reactors are subjected to the simultaneous action of mechanical stress and irradiation. Under these combined effects, components such as cladding, springs of fuel assemblies and screws in reactor vessel internals undergo irreversible deformation due to a phenomenon known as irradiation creep, which is significantly more pronounced than thermal creep.
Many models of irradiation creep have been proposed in the literature, leading to various dependencies on the applied stress and microstructural features (dislocations, dislocation loops, etc.). However, none of them could be validated at the microscopic scale, due to the lack of dedicated in-situ experiments and simulations involving dislocation climb and glide.
The objective of this internship is to identify possible climb and glide deformation mechanisms explaining creep in metals and metallic alloys under irradiation. To this end, we will use two simulation codes developed at CEA: STACCATO, an object kinetic Monte Carlo (OKMC) code that simulates the evolution of irradiation damage under the stress generated by microstructural features, and NUMODIS, a nodal dislocation dynamics (DD) code that accurately models dislocation glide and dislocation interactions.
The two main steps of the work will be as follows:
Object kinetic Monte Carlo, Dislocation dynamics
Master’s Degree (M2) or Engineering School specializing in Materials Science, Condensed Matter Physics.
Ability to code (Fortran, C++) is a plus.
Saclay
France
Gif-sur-Yvette
Bac+5 - Diplôme École d'ingénieurs
Oui
01/02/2027
The CEA is the French Alternative Energies and Atomic Energy Commission ("Commissariat à l'énergie atomique et aux énergies alternatives"). It is a public body established in October 1945 by General de Gaulle. A leader in research, development and innovation, the CEA mission statement has two main objectives: To become the leading technological research organization in Europe and to ensure that the nuclear deterrent remains effective in the future.
The CEA is active in four main areas: low-carbon energies, defense and security, information technologies and health technologies. In each of these fields, the CEA maintains a cross-disciplinary culture of engineers and researchers, building on the synergies between fundamental and technological research.
The civilian programs of the CEA received 49% of their funding from the French government, and 30% from external sources (partner companies and the European Union).
The CEA had a budget of 4,3 billion euros.
The CEA is based in ten research centers in France, each specializing in specific fields. The laboratories are located in the Paris region, the Rhône-Alpes, the Rhône valley, the Provence-Alpes-Côte d'Azur region, Aquitaine, Central France and Burgundy. The CEA benefits from the strong regional identities of these laboratories and the partnerships forged with other research centers, local authorities and universities.
