• PhD position in CEMES, Toulouse: Elementary mechanisms of shear coupled grain boundary migration

    This PhD will start in September/October 2017 and combines atomic simulations and TEM characterization.
    The theoretical study will be essentially performed by using atomistic simulations (molecular dynamics, Nudge Elastic Band method...) with a semi-empirical potential of Embedded Atom Method type. The simulations will use the LAMMPS code and will be performed using lab computing facility or facilities at the regional or national scale.
    The experimental part will be based on in-situ deformation experiments using different experimental setups, some of them already existing (high temperature tensile holder, nano-indentor), others in development, and different kind of imaging techniques (bright/dark field, orientation mapping, strain/stress mapping, high resolution). The use of new tensile devices incorporating micro-actuators and FIB (Focused Ion Beam) machined samples should for instance allow high resolution TEM experiments. The success of such experiments at a scale close to the simulations will allow the identification and the monitoring of the deformation at atomic scale.These experiments will benefit also from established international collaboration: we will study both freestanding metal thin films with small grain (processed in the US), or bicrystals containing only one grain boundary, provided by RWTH university in Aachen.

    Profile: The candidate should have an overall good level in physics (mechanics, statistical physics, solid state physics, and crystallography) and knowledge in programming language (fortran, C, C++, python. . . ). Knowledge in elasticity and plasticity will be valuable.

    Contact: N. Combe (combe@cemes.fr), F. Mompiou (mompiou@cemes.fr)

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