M/F postdoctoral fellowship on Phase Transitions of Iron and Tin under dynamic compression

European Commission; France; Sur place; EUR 30 000 - 45 000; Plein temps

Résumé du poste

Un institut de recherche en France propose un poste postdoctoral axé sur les transformations polymorphiques du fer et de l'étain sous chargement dynamique. Le candidat sélectionné travaillera avec un groupe de recherche dynamique pour aborder des questions fondamentales sur les matériaux dans des conditions extrêmes, en participant également à des événements et des collaborations au sein de la communauté de recherche.

Qualifications

• Doit posséder un doctorat en physique, sciences des matériaux ou équivalent.
• Expérience avec des techniques comme la diffraction aux rayons X ou les simulations thermomécaniques appréciée.

Responsabilités

• Réaliser des simulations numériques d'expériences reportées.
• Concevoir de nouvelles expériences de compression laser.
• Participer aux réunions régulières et aux activités de la communauté ChocoDyn.

Connaissances

Physique des chocs

Simulations hydrodynamiques

Diffraction aux rayons X

Mesures de vitesse dans les expériences de choc

Matériaux science

Formation

Doctorat en physique ou science des matériaux

Description du poste

Organisation/Company CNRS Department Procédés et Ingénierie en Mécanique et Matériaux Research Field Engineering » Materials engineering Physics » Acoustics Researcher Profile Recognised Researcher (R2) Country France Application Deadline 8 Jul 2025 - 23:59 (UTC) Type of Contract Temporary Job Status Full-time Hours Per Week 35 Offer Starting Date 1 Sep 2025 Is the job funded through the EU Research Framework Programme? Not funded by a EU programme Is the Job related to staff position within a Research Infrastructure? No

Offer Description

Polymorphic transformations of iron and tin have been widely studied for many decades, under both quasi-static and dynamic compression, over broad ranges of compression rates. Despite such extensive research work, large discrepancies on the phase boundaries remain to be explained, and key questions remain open on the mechanisms governing the transitions, their kinetics, and even the very nature of some of the phases in presence. The influences of the initial microstructure (inclusions, crystal orientations, grain boundaries…) and loading parameters (stress triaxiality, strain rate…) are not completely elucidated either.

The postdoctoral position will start with an updated review of the state of the art (a choice can be made between iron and tin depending on the background and personal interests of the candidate). Then, numerical simulations of some selected experiments reported in the literature will be performed with a hydrocode available in the federation. The multiphase equations of state and constitutive laws implemented in this code will be tested and improved to reproduce a variety of existing results. In parallel, new experiments of laser-driven compression will be designed to complement the data and answer some of the questions mentioned above. Finally, some of these experiments will be performed in large scale facilities (HERA, LULI2000, SACLA, EuXFEL).

The ChocoDyn federation brings together about a hundred researchers from 19 French
laboratories studying dynamic compression of materials over a wide range of pressures (a few bars to several Mbars), load durations (ns to ms), and loading rates (about 103s-1 to 107s-1).
One objective is to address societal challenges related to the durability of materials under severe conditions of high pressure, high temperature, and extreme deformation rates. The scope also includes fundamental questions of geophysical interest such as hypervelocity impacts or phase transformations in highly dynamic conditions. This last point is the subject of the present post-doctoral position.
This position is proposed by the work package of phase transitions under dynamic loading and will be performed in collaboration of the PPRIME (Poitiers) IPR (Rennes), PIMM (PARIS) and CEA (Bruyère le châtel) Laboratories.
Regular meetings will be organized within the research group working more specifically on phase transitions in the federation. The post-doc will also be fully involved in the broader activity of the Chocodyn community (summer schools, events, workshops…).

The candidate must hold a PhD in one of the disciplines below
- Shock physics
- Phase transitions in solid materials
- Materials science
Experience with one of the techniques below will also be appreciated
- X-ray diffraction
- Velocity measurements in shock experiments
- Hydrodynamic or thermomechanical simulations