MATS8AF Structure physics and mechanical properties | ECTS Credits : 2 Duration : 21 hours | Semester : S8 |
Person(s) in charge:
Sébastien ALLAIN, Professor, sebastien.allain@mines-nancy.univ-lorraine.fr |
Keywords: crystalline plasticity, dislocations, hardening, thermal activation, recrystallisation |
Prerequisites: macroscopic mechanical properties, linear elasticity, crystalline structures, defects |
General objective : Presentation of physical mechanisms of plastic deformation |
Programme and Contents:
- Dislocations: characteristics, properties, displacement, observation methods, force, lattice friction, thermally activated glide, elementary mechanisms
- Deformation of single crystals: comparison of the different crystalline structures, slip systems, resolved shear stress
- Twinning, martensitic transformations, shape memory effect
- Influence of the microstructure in pure materials : effective and internal stress, strain hardening, influence of grain size
- Hardening processes in alloys: solid solution strengthening, precipitation hardening
- Influence of temperature and strain rate: dynamic recovery and recrystallisation, creep, brittle-to-ductile transition
Case studies: - elastic interactions between dislocations, subgrain
- characterisation of dislocations in Silicon by X-ray diffraction
- defects in compact structures: sphere model
- strain hardening model: forest model
- crossing of point and extended obstacles
- plastic deformation by thermal shock in a Silicon wafer
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