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-25-0160
Thesis topic details
Category
Condensed Matter Physics, chemistry, nanosciences
Thesis topics
Thermally activated glide of screw dislocations in bcc metals
Contract
Thèse
Job description
Thermally activated glide of dislocation is a key point for understanding the plastic deformation of metals. The screw dislocation in bcc metals is an archetypical case for which a large quantity of experimental data has been published in the scientific literature. It is then possible to compare these data to the theoretical predictions realized from the Vineyard statistical theory [1,2]. Such a theory is an essential tool allowing to perform a scale transition from atomistic computations toward macroscopic scale at which are realized the deformation tests.
The aim of our research will be to test Vineyard theory in comparison with molecular dynamics simulations [3]. Some preliminary computations have shown a significant discrepancy that is not present when we repeat the comparison for point-like defect as vacancies or self-interstitial atoms.
[1] Vineyard G.H., J. Phys. Chem. Solids 3, 121 (1957).
[2] Proville L., Rodney D., Marinica M-C., Nature Mater. 11, 845 (2012).
[3] Proville L., Choudhury A., Nature Mater. 23, 47 (2024).
University / doctoral school
Physique en Île-de-France (EDPIF)
Paris-Saclay
Thesis topic location
Site
Saclay
Requester
Position start date
01/09/2025
Person to be contacted by the applicant
PROVILLE Laurent
laurent.proville@cea.fr
CEA
DES/DMN/SRMP/SRMP
CEA/Saclay
2 66 65
Tutor / Responsible thesis director
PROVILLE Laurent
laurent.proville@cea.fr
CEA
DES/DMN/SRMP/SRMP
CEA/Saclay
2 66 65
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