MEMO / Mechanics, microstructure, oxidation, corrosion

Research activities of MEMO group aim at understanding and improving properties of materials for structural application. They address the study of mechanical behaviour and reactivity in various environments (gas and liquid). A special focus is put on the study of coupling between microstructure evolution, phase transformation, environmental effects and mechanical properties. Studies concern mainly metallic alloys and their protective coatings but also multimaterials, even ceramics. Though most of them are conducted toward industrial applications in collaboration with industrial partners, the level of understanding and the precision of modeling often require the use of model materials and the development of original experimental set-ups. A very large panel of microstructural characterisations is used, from optical microscopy up to large instruments such as synchrotron and neutron diffraction. This experimental approach is complemented by modeling and simulation either using commercial softwares or with in-house developed programs. Both experimental characterisation and numerical simulation scale from atoms (e.g. HRTEM or DFT) up to macroscopic lengths (Finite Elements).

MEMO Research topics

more details about MEMO group research activities

The group’s strategy is to uphold the highest level of expertise regarding solidification, solid state phase transformations, plasticity and mechanical behavior, high temperature oxidation and protection, corrosion and stress corrosion cracking. This is achieved throughout shared projects combining any association between the four generic keywords: mechanics, microstructure, oxidation and corrosion. This strategy is based first and foremost on an experimental approach, but the use of modeling is frequent when it comes to atomic scale calculations (e.g. DFT), micrometric scale simulations (microstructure, diffusion) or larger scale calculations (multi-scale mechanics)

In addition to the local equipment (XPS, AES , XDR and HT-XDR, SEM-EDS, Raman spectroscopy, etc.) the MEMO team and the CIRIMAT also have access to the Raimond Castaing micro-characterisation research unit (FEG-SEM, FIB, microprobes, SIMS, TEM) and to the “nano-X” characterisation hub (nanomaterial characterisation with diffraction and X-ray diffusion, XRD). Both units make available, for research laboratories and industries, modern tools that are unique in the region. Recently, our team undertook two new research focuses: additive manufacturing and structural alloy reactivity under high temperatures and complex atmospheres.

The expertise of MEMO group includes any combination of the following keywords:

  • mechanical behaviour, traction, creep, fatigue, isothermal and cyclic high temperature oxidation, high temperature corrosion, aqueous corrosion, stress corrosion cracking (SCC), SCC assisted by irradiation
  • coupling between creep and oxidation, fatigue and corrosion, microstructure and properties, O and H embrittlements, internal and inter-granular oxidation
  • solidification, microstructural evolution, heat treatments, model alloys and protective coatings developed by using Spark Plasma Sintering
  • steels, cast irons, titanium alloys, aluminum alloys, nickel base superalloys, intermetallics, protective coatings, thermal barrier coatings (TBC), abradable coatings, multimaterials, interlocked or interlaced materials
  • modelling of: thermodynamic properties, mechanical behavior, oxidation kinetics, phase transformations, solid state diffusion, with: Calphad method, finite differences, finite elements, DFT, ..
  • FIB, SEM, TEM, STEM, EELS, EDX, AFM/KFM, DTA, TGA, CTGA (cyclic TGA), XDR, SIMS, XPS, Raman…