PhD opportunities

Microstructure evolution during HFQ of AA2219 (CEMEF, CMAT and Airbus)

Thesis proposal

Area of expertiseMécanique numérique et Matériaux
Doctoral SchoolSFA - Sciences Fondamentales et Appliquées
SupervisorBOUCHARD Pierre-Olivier
Co-supervisorMOCELLIN Katia
Research unitCentre de Mise en Forme des Matériaux
Keywordsthermomechanical processing, plasticity
AbstractThis PhD aims at investigating microstructural evolution during HFQ. Samples obtained from PhD1
using lab scale tests with well-controlled thermo-mechanical conditions will be analyzed with
quantitative microstructural investigation applying different complementary techniques (hardness
measurements, EBSD, TEM, DSC and XRD1
). Therefore, the effect of HFQ processing conditions on
further microstructure evolution will be established for an 2**** alloys and can be presented as
processing-like map.
The activated physical mechanism and their interactions will be accessed through the analysis of
microstructure evolution during the HFQ process with several microstructural quantities (grains size
and orientation spread, dislocation density and sub-structures, second phase particle size distribution
and volume fraction, crystallographic texture…). Those mechanisms will then be modeled for
microstructural predictions and coupling with mechanical behavior.
The main challenges rely on the analysis of interaction between precipitation of hardening phases and
plasticity which may involve a number of phenomena: heterogeneous nucleation, faster growth and
coarsening of precipitates, recovery and dynamic recrystallisation. The experimental plan was carefully
established to get insight into mechanisms which control microstructure evolution of 2*** alloys
during HFQ.
ProfileMaster or engineering degree in materials science with good knowledge of
phase transformations and plasticity mechanisms in metallic alloys. Motivation for
experimental work.
FundingConvention CIFRE