MATS8AF STRUCTURE PHYSICS AND MECHANICAL PROPERTIES

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

Abilities: 

Level

Description and operational verbs

Know

Understand
 

Apply 

Analyse 

Summarise

Assess

Assessment:

• Written Test

• Continuous report

• Oral report

• Project

• Written Report