Ph.D. in materials and processing : Modeling of recovery and recrystallization in Tantalum alloys

The objective of the thesis will be to establish a model for the static recrystallization of Tantalum, predicting the recrystallized volume fraction and the grain size after a variable thermal / mechanical history. The model will most likely consider a single dislocation density for which evolution laws have already been identified as a function of plastic deformation (constitutive law), and thermal history (recovery law). Experimentally, mechanical testing will be performed and combined with thermal treatments. Microstructures will be quantified by optical and electronic microscopy (combined with the EBSD technique), and micro-hardness measurements.

These techniques will give access to the dislocation densities, grain sizes and crystallographic orientations. Nucleation and growth mechanisms could be studied more thoroughly by in situ observations, in collaboration with Montpellier University. After implementation within finite element codes, the model will be validated first with respect to simple, reproducible experiments, and second, with respect to industrial pieces. An optimization of the industrial fabrication route could be proposed based on the simulation results.

Infos on the web site : http://www.cemef.mines-paristech.fr/sect ions/formations/doctorats/pour-postuler