Quantum mechanics

Deformation (meteorology)

Metallurgy

Materials science

Severe plastic deformation

Metastability

Grain boundary diffusion coefficient

Grain boundary

Thermodynamics

Physics

Diffusion

Microstructure

Condensed matter physics

Composite material

Crystallography

Grain boundary strengthening

Chemistry

Diffusion creep

MATERIALS TRANSACTIONS

The present knowledge on grain boundary-related phenomena specific for severely plastically deformed materials is reviewed and critically analyzed in detail. Severe plastic deformation is shown to introduce specific metastable states of the grain boundaries which are characterized by enhanced diffusion rates, high-density of specific structure elements and large (still localized) elastic strains. An intrinsic heterogeneity of the deformation-induced modifications is revealed and examined on different scales. Relations between the existence of deformation-modified grain boundaries, specific microstructure features and resulting properties are highlighted.

Grain Boundaries and Diffusion Phenomena in Severely Deformed Materials