Diffusion in Solids
- Diffusion in Solids: Introduction-1
Importance of diffusion in metallurgical phenomena
How to control the processes by controlling the diffusion
Advantages and disadvantages of diffusion
- 2. Diffusion in Solid versus liquid and gas
Interstitial/substitutional diffusion
Atom/ion diffusion: (e.g. oxidation, ceramics)
Molecule diffusion: (e.g. ink, gas)
Atom or mass transportation versus vacancy diffusion
- 3. Self diffusion (pure metals)/Chemical diffusion (alloys)
Bulk versus grain boundary diffusion and surface diffusion
Mixed mechanisms
- 4. Factors affecting diffusion
Diffusion laws and phenomena
Darken's law
Atom or mass transportation versus vacancy diffusion
- 5. Fick's first law
Fick's second law
Kirkendal phenomenon/effect
- 6. The mechanisms of diffusion
Point defects (vacancy)/interstitial/substitutional
- 7. Interdiffusion (grain boundary diffusion) & coating
- 8. Surface hardening: Carburizing
- 9. Homogenization/coring/segregation
- 10-Vacancy-controlled processes (annealing/quenching)
- 11- Precipitation/Aging/Stabilization
- 12. Creep/Transformation/Corrosion/Oxidation
- 13. Diffusion Bonding/Diffusion Welding (applications & mechanisms)
- 14. Diffusion Brazing/Cold welding by rolling/Roll bonding) (applications & mechanisms)
- 15. Diffusion during weld solidification (lack of diffusion, concentration gradient/segregation)
- 16. Industrial Examples