PhD opportunities

Phase field and Cosserat simulation of recrystallization in polycrystals

Thesis proposal

Area of expertiseMechanics
Doctoral SchoolSystems Engineering, Materials, Mechanics, Energy
SupervisorM. Samuel FOREST
Research unitCentre of materials
ContactFOREST Samuel
http://www.mat.mines-paristech.fr/Accueil/Propositions-de-theses/
Starting dateOctober 1st 2020
KeywordsCrystal plasticity, Phase field, Cosserat mechanics, Grain boundary migration, Recrystallization, Finite element method
AbstractThe objective of the project is to develop the most recent multi-scale methodologies from physical metallurgy and continuum mechanics in order to contribute to the design of bimodal microstructures, i.e. with two populations of distinct grain sizes, of metal alloys with high work hardening and sufficient ductility. The mechanisms involved are grain growth and recrystallization induced by the energy stored in polycrystals due to plastic deformation. The proposed approach combines Cosserat media mechanics applied to crystal plasticity with the phase field method suitable for mobile interface modeling. The three-field theory (displacement, crystal orientation, crystal order) will be informed by atomic simulations of grain boundary properties. Validated in the case of harmonic microstructures available at the GPM of INSA Rouen, the approach will be extended to hexagonal alloys to take advantage of their strong anisotropy. Numerical simulations will be carried out in 2D and 3D using the nonlinear finite element method.
ProfileTo be admitted to a doctorate, the candidate must hold a national master's degree or another diploma conferring the master's degree (engineering diploma, equivalent foreign diploma, etc.), following a course of training establishing his research aptitude.
Applicants will be selected after interview before a jury assessing their research aptitude and the adequacy of their training and knowledge with the proposed thesis subject. Strong scientific knowledge, a first research experience (internship 4 months minimum), a strong motivation for research, a good level in English will be required (minimum B2).
The application must include:
a motivation letter including the candidate's professional project
a detailed curriculum vitae mentioning studies, research internships carried out, diplomas with date obtained, professional experience, research axes envisaged
a transcript of marks from the previous course (engineer and / or master cycle)
one or more letters of recommendation ...
a certificate of English level.
for a non-French speaking student, an A2 / B1 level in French (European standard) is recommended when entering a doctorate
for students who do not hold a national research masters diploma, all documents attesting to the students qualifications in research training (research internship certificates with summary of the dissertation, recommendations, publications, etc.)
a copy of identity card or passport

The documents in pdf format must be sent to recruitment_these@mat.mines-paristech.fr no

ONLY THE APPLICATIONS ADDRESSED BY E-MAIL WILL BE TAKEN INTO ACCOUNT
FundingContrat de recherche
PDF documenthttps://www.adum.fr/script/downloadfile.pl?type=78&ID=29043