Description
Construction of kinetic theories. Solution of the diffusion equation; homogenization. Atomic scattering mechanisms. Interstitial diffusion: thermal activation, diffusion in the stationary and non-stationary state. Substitute diffusion: "auto" diffusion, diffusion by the gaps, atomic mobility. Diffusion through grain boundaries, dislocations and surfaces. Precipitation at grain boundaries. Structural hardening. Diffusion in multi-phase binary systems. Boundaries in single-phase solids: effect of thermal activation on the migration of grain boundaries, kinetics of grain growth. Solidification: germination and growth of a pure solid; molded parts and fusion welds. Case studies. Transformations through diffusion in solids: homogeneous and heterogeneous germination. Growth of the precipitate. Characteristics of transformation without diffusion. Kinetics of phase transformation under lighting or under electric voltage. Surface and interface reactions: adsorption, desorption, diffusion, germination, growth, role of surface properties, examples of kinetics of reactions on surfaces and interfaces.