Phd Thesis

**C**-TEC IS RECRUITING**

**PhD Thesis (CIFRE) F/H/X**

**Objective**: The objective of the Ph.D. is to better understand the precipitation mechanisms during the ageing and the simulated in service thermal exposure of low-density Al-Cu-Li alloys in order to improve their thermal stability.

**Methods**:The microstructure and, more precisely, the precipitation mechanisms in Al-Cu-Li alloys will be investigated in depth. The influence of process parameters (solution heat treatment, stretching, ageing ) on the precipitation during the ageing and the simulated in service thermal exposure will be studied. To characterize the precipitation of δ’, GP zones, θ’, T1, S’microstructures will be investigated using advanced techniques such as atom probe tomography (APT), transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). Some mechanical tests (hardness, tensile and toughness) will be also performed to study the effect of the precipitation on the mechanical properties.

**We are looking for** a highly-motivated individual with a Master or Engineer degree in materials science. An aptitude for experimental work will be appreciated.

**Starting date**: October 2025 **Duration**: 3 years

**Host laboratories**:SIMaP (80-90%) and Constellium C-TEC (10-20% with possible adjustment during the different phases of the thesis)

**Academic supervision (SIMaP)**: Frédéric De Geuser, Alexis Deschamps, Isabelle Mouton

**Industrial supervision (Constellium C-TEC)**: Hélène Godin, Marion Bellavoine, Christophe Sigli