List of members |
Facilities |
Internships and jobs |
PhD |
Publications |
News |
Team
- Permanent members: Silvère Akamatsu, Sabine Bottin-Rousseau, Patricia Ott, Bumedijen Raka
- Engineer on fixed-term contract: Maria Achache
- PhD student: Mehdi Medjkoune
Solidification microstructures are out of equilibrium patterns. Of micrometric characteristic dimensions, they appear on the crystal growth front (solidification front). They are generated by the nonlinear interactions between the diffusion of solute in the liquid and capillary forces. We are studying the solidification dynamics in situ by real-time videomicroscopy during directional solidification of transparent and metallic alloys. The results are interpreted phenomenologically (amplitude equations) and using dynamic numerical simulations (collaborations). Our goal is to improve the general understanding of the phenomena of far from equilibrium pattern formation and to help the development of new processes for the elaboration of materials by solidification.
- 1D eutectic fronts in thin samples: phenomenology of secondary instabilities
- 2D lamellar and fibrous eutectic fronts in massive samples
- Single-phase faceted fronts in directional solidification in thin samples
- Control of solidification microstructures by feedback loop using a network of laser spots
Collaborations
Experimental collaborations:
- Laszlo STURZ, Victor WITUSIEWICZ, Ulrike HECHT ACCESS e.V., Aachen, Allemagne
- Wolfgang LOSERT, IREAP, Paint Branch Dr., Université de Maryland, USA
- Melis Serefoglu, Koç University, Istanbul, Turquie
Theorical collaborations:
- Mathis PLAPP, LPMC, Ecole Polytechnique, Palaiseau, France
- Alain KARMA, Northeastern University, Boston, USA
Funding
- CNES financing by annual conventions
Publications
- U. Hecht, J. Eiken, Silvère Akamatsu, S. Bottin-Rousseau. Phase boundary anisotropy and its effects on the maze-to-lamellar transition in a directionally solidified Al Al2Cu eutectic. Acta Materialia, Elsevier, 2019, 170, pp.268-277. ⟨10.1016/j.actamat.2019.03.035⟩. ⟨hal-02100023⟩
- Supriyo Ghosh, Alain Karma, Mathis Plapp, Silvère Akamatsu, Sabine Bottin-Rousseau, et al.. Influence of morphological instability on grain-boundary trajectory during directional solidification. Acta Materialia, Elsevier, 2019, ⟨10.1016/j.actamat.2019.04.054⟩. ⟨hal-02047550⟩
- Samira Mohagheghi, Sabine Bottin-Rousseau, Silvère Akamatsu, Melis Şerefoğlu. Decoupled versus coupled growth dynamics of an irregular eutectic alloy. Scripta Materialia, Elsevier, 2020, 189, pp.11-15. ⟨10.1016/j.scriptamat.2020.07.053⟩. ⟨hal-02936627⟩
- Sabine Bottin-Rousseau, Mehdi Medjkoune, Oriane Senninger, Laurent Carroz, Richard Soucek, et al.. Locked-lamellar eutectic growth in thin Al-Al2Cu samples: in situ directional solidification and crystal orientation analysis. Journal of Crystal Growth, Elsevier, In press, pp.126203. ⟨10.1016/j.jcrysgro.2021.126203⟩. ⟨hal-03256679⟩
- Bottin-Rousseau, V.T. Witusiewicz, U. Hecht, S. Akamatsu, Coexistence of rod-like and lamellar eutectic growth patterns, submitted to Scripta Mater. (2021).
- Akamatsu, S. Bottin-Rousseau, Numerical simulations of locked lamellar eutectic growth patterns, submitted to Metal. Mater. Trans. A (2021)
