24-151 Nucleation and Growth Competition in

il y a 2 semaines

Nancy, France CNES - Centre National d'Etudes Spatiales Temps plein

Doctorat, 36 mois
- Temps plein
- Aucune expérience exigée
- Maitrise, IEP, IUP, Bac+4
- Material Sciences in Microgravity

**Mission**:
This thesis is part of the MAP (Microgravity Application Promotion) METCOMP (Metastable Solidification of Composites:
Novel Peritectic Structures and In-Situ Composites) programme managed by the European Space Agency, which will be coordinated by the University of Lorraine from January 2023. Many alloys of technological interest and economical importance are peritectic alloys (steels, titanium alloys, bronzes). Yet, the understanding of peritectic microstructure is still poor compared to eutectics. There are several reasons for this: most industrial alloys are multicomponent alloys, and there are few "model" binary alloys with a peritectic reaction. Among them, the Cu-Sn alloys has been investigated

in the METCOMP project and have allowed significant advances in the understanding of peritectic coupled growth (PCG). PCG usually occurs in peritectic systems solidified processed at low solidification rate. The recent development of new manufacturing technique involving high thermal gradient and solidification rate, such as additive manufacturing, might also lead to metastable microstructures in peritectic alloys. PCG, or at least two-phase growth, has been observed at high growth rate, but the physical mechanisms behind it remain unsolved yet. Ground experiments will be

performed on binary peritectic alloys using electromagnetic levitation experiments (EML), and HE-XRD analysis in European synchrotron facilities to follow the nucleation sequence and further growth in-situ. The alloys considered will be Cu-Sn, which has already been studied within the METCOMP project, and alloys for which two-phase growth has been observed at high growth rate (Zn-Ag, Ni-Zr). The EML experiment available at Université de Lorraine is portable equipment, transportable in synchrotrons and on parabolic flights. It consists of a high-frequency generator, an enclosure with a controlled atmosphere, inside which the levitation system is located. This system is made up of copper coils which heat the alloy and cause it to levitate. Under the sample, a ceramic tube allows the sample to be cooled by a helium jet, the flow rate of which imposes the undercooling. The chamber is equipped with a pyrometer, a high-speed camera and a thermal camera. First, the nucleation competition between the pro-peritectic and the peritectic phase will be investigated by controlling the undercooling of the liquid alloy in the temperature range where the liquid and the 2 solid phases thermodynamically co-exist. Post-mortem analysis of the microstructure coupled with in-situ HE-XRD will help clarifying the nucleation competition between the solid phases, depending on materials (phases) properties, alloy composition and undercooling. By achieving subsequent undercoolings, EML experiments allow reaching high growth rates. Peritectic growth at high growth rate remains poorly explored and could lead to new metastable microstructures.

Occurrence or not of PCG depending on undercooling will be investigated. Growth kinetics will be followed by rapid imaging and microstructure characterized by post-mortem analyses. Again, the role of materials, alloy composition and nucleation on peritectic microstructure will be quantitatively compared. Together with the experimental results from available microgravity platforms (proposals for ISS EML Sample Batch 5 and 6 are in preparation, parabolic flights), this is expected to give insights into the role of gravity and convection on two phase growth at high growth rate. By combining the nucleation and growth modeling and the experimental analysis, the formation mechanism and the subsequent evolution concerning the competition of nucleation and growth between the two solid phases in peritectic alloys will be clarified. After successful completion of these goals, deeper understanding of the initiation and proceeding of metastable peritectic microstructure and the role of the convection in the melt will be achieved. Within the METCOMP Project, the PhD student will make short stays (1 week to 1 month) with the project partners, in particular at Montanuniversitaet Leoben (Austria) and at the Wigner Research Center for Physics in Budapest (Hungary). He/she will have the opportunity to work on high energy X-Ray sources (DESY Petra III in Hamburg and ESRF in Grenoble) and to work in close collaboration with ESA for experiments in microgravity.

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**Profil**:
Master in Materials Sciences, Materials Physics or Metallurgy

**Laboratoire**:
Institut Jean Lamour

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