This course provides a comprehensive understanding of the atomistic theory of crystal defects in materials, focusing on their thermodynamic and kinetic characteristics. Students will explore the classification, geometry, structure, and behavior of point and extended defects in pure materials, alloys, and compounds. The course emphasizes applying atomistic theory to interpret material behavior and to evaluate how defects influence key properties such as strength, ductility, diffusion, and phase stability.
Subject aims
• Principles of crystallography. Crystal structure of pure materials and compounds. Hierarchy of crystal defects.
• Point defects in pure materials: bcc, fcc, hcp, diamond lattice. Equilibrium concentration. Point defects in compounds and alloys. Migration of point defects. Relationship with diffusion, creep and phase transitions.
• Dislocations. Geometry of dislocations in various crystals. Dislocation core. Jogs and kinks of dislocation. Dislocation mobility. Link with plasticity and diffusion. Interaction of dislocation with point defects.
• 2D spatial defects: GB, interface, surface. Grain boundary migration. Defects within defects. Defects in 2D crystals. Complexion transitions of spatial defects.
• Atomistic mechanisms of defect migration. Correlation Effects. Chemical Diffusion. Impurity diffusion. Diffusion along the spatial defects. Ionic diffusion in Nonmetals.
- Kursleiter/in: Sergei Starikov