Stored Energy in Plastically Deformed Metals

il y a 2 semaines

SaintÉtienne, France ENS des Mines de Saint-Etienne Temps plein

**Stored energy in plastically deformed metals**:

- Réf **ABG-126367**
- Sujet de Thèse- 21/10/2024- Contrat doctoral- ENS des Mines de Saint-Etienne- Lieu de travail- Saint-Etienne - Auvergne-Rhône-Alpes - France- Intitulé du sujet- Stored energy in plastically deformed metals- Champs scientifiques- Matériaux
- Physique
- Sciences de l’ingénieur
- Mots clés- X-ray diffraction, intragranular strain, dislocations, simulation, in situ measurement**Description du sujet**:
Physical properties of metals and alloys are influenced by lattice defects present in the crystal, which generally are surrounded by an elastic strain field. Accurate determination of the corresponding strain energy is extremely important in practice since it serves as reference for checking the existing theories linking the microstructure to macroscopic physical properties. For example the stored energy is considered as the driving force for recrystallization, a very old, but still unsolved problem in materials science. The reason is the lack of a general theory/model that captures the complex microscopic processes acting during metal forming and heat treatment. For single-phase materials, the main mechanisms are plastic deformation, recovery, and finally the germination and growth of new grains. Many studies show that several factors contribute, to varying degrees, to recrystallization but, without exception, all emphasize the importance of the plasticity induced stored energy.

During this thesis we will study the recrystallization of a model Fe-3%Si alloy. The alloy will be first cold-rolled and then the deformed state characterized by electron microscopy (EBSD) and X-ray diffraction. The dislocation density and the stored energy will be determined from the data obtained with two methods. Finally, the comparison of the results obtained with the two techniques will be performed and the description of the heterogeneity of the plastic deformation will be obtained. The latter expresses the variation of the dislocation density as a function of grain crystallographic orientation. In the second part of the PhD in situ experiments will be performed at ESRF using the scanning 3DXRD method. This will allow determining the strain at the intragranular level.

Data evaluation will be performed with already existing scientific software, but basic knowledge of Python is necessary.

**Nature du financement**:

- Contrat doctoral**Précisions sur le financement**:

- Agence Nationale de la Recherche**Présentation établissement et labo d'accueil**:

- ENS des Mines de Saint-EtienneÉcole Nationale Supérieure des Mines de Saint-Étienne is a graduate engineering school and research institute aka « Grande École d’Ingénieurs » founded in 1816. Our range of career-focused diplomas will open doors to some of the best careers in the field of engineering and enable you to build your own international network.

**Intitulé du doctorat**:

- PhD in engineering sciences**Pays d'obtention du doctorat**:

- France**Etablissement délivrant le doctorat**:

- Lyon University**Ecole doctorale**:

- Ecole doctorale 488 Sciences Ingénierie Santé SISThe knowledge of Python programming language is necessary- 21/12/2024

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