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Doctoral candidate researcher in aluminium alloys metallurgy

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- Français-- Anglais

Date Limite Candidature : mardi 18 juillet 2023

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Informations générales

Intitulé de l'offre : Doctoral candidate researcher in aluminium alloys metallurgy (H/F)
Référence : UMR5266-FREDEG-002
Nombre de Postes : 1
Lieu de travail : ST MARTIN D HERES
Date de publication : mercredi 19 avril 2023
Type de contrat : CDD Doctorant/Contrat doctoral
Durée du contrat : 36 mois
Date de début de la thèse : 1 octobre 2023
Quotité de travail : Temps complet
Rémunération : 2 135,00 € gross monthly
Section(s) CN : Materials, nanomaterials and processes chemistry

Description du sujet de thèse

Tiitle:« Study of the decomposition kinetics of multicomponent aluminium alloys at the boundary between clustering and spinodal decomposition »

The thesis is part of the ANR-funded project (https://anr.fr/) entitled "SpinodalDesign" involving the GPM in Rouen, SIMAP in Grenoble and UMET in Lille) and dedicated to the design of innovative aluminium alloys with increased ductility and mechanical strength, via phase transformations (spinodal transformation, precipitation) in ultra-fine microstructures.

The objective of the thesis is to explore and better understand the decomposition kinetics of multicomponent aluminium alloys with a focus on the early stages. Indeed, within the framework of the ANR project "SpinodalDesign", which aims to combine structural hardening by precipitation of a nanometric phase and ultra-fine grains, one of the obstacles identified is that the presence of grain boundaries favours heterogeneous nucleation at the expense of the desired nanometric phase. Spinodal decomposition is characterised by an absence of activation energy and could constitute a solution, but concerns very concentrated systems that are not very suitable for industrial applications.
The project will focus on the exploration of the boundary between "classical" nucleation-growth systems and spinodal decomposition systems using a combinatorial metallurgy approach by creating samples with compositional gradients (diffusion couples or multiples) from base alloys chosen from classical compositions (industrial type 7xxx AlZnMg or 2xxx AlCuMg or AlLiCu) and compositions where spinodal decomposition is expected (AlZn, AlLi, AlMg). The decomposition kinetics will be characterised by high-throughput experiments such as small-angle X-ray scattering (SAXS) and X-ray diffraction (XRD), allowing in situ characterisation of the reaction at each point of the gradient. These experiments, carried out both at the synchrotron (ESRF) and on laboratory facilities, will make it possible to identify optimal compositions and mechanism turning points. They will then be completed by local characterizations using electron microscopy as well as the new Cameca LEAP 6000 atom probe tomography (APT) instrument installed at SIMaP in summer 2023.
The data, together with complementary thermodynamic calculations, will allow the identification of promising alloy compositions and mechanism bifurcations. Selected compositions will then be subjected to severe plastic deformation (by HPT, HPS or FSW/P in collaboration with the partners of the "SpinodalDesign" project) in order to study the influence of grain size on decomposition.
The link with the other "SpinodalDesign" partners (1 PhD at SIMaP in Grenoble, 1 PhD at UMET in Lille and 1 post-doctoral fellow at the GPM in Rouen) should thus make it possible to propose new ways of designing innovative aluminium alloys with increased ductility and mechanical strength.

Contexte de travail

Host lab:
The PhD will take place at SIMaP (CNRS – Grenoble INP – UGA) in Grenoble (France) with co-supervision from W. Lefebvre from GPM Rouen, coordinator of the ANR project « SpinodalDesign ». Missions to the other partners of the projects will take place during the PhD.
Frédéric De Geuser and Hugo Van Landeghem (SIMaP), Williams Lefebvre (GPM)