Free energy - composition diagrams for binary systems. Diffusion in interstial and substitutional solid solutions. Atomic mobility and vacancy diffusion. High diffusivity paths. Kirkendall effect. Diffusion in ceramics, Applications of diffusion equations. Homogeneous and heterogeneous nucleation in a single component system. Interface and diffusion controlled growth. Coherent, semicoherent and incoherent interfaces. Transformations controlled by heat flow. Solidification of a single phase alloy. Dendritic and cellular growth. Kinetics of eutectic and eutectoid transformations, precipitation and dispersion hardening. Cold work, recovery and recrystallization. Grain growth. Order-disorder changes. Elements of martensitic transformation. Hardening and tempering phenomena.