11. Glossary

Extrinsic dislocation; extrinsic dislocation

Dislocation introduced into a grain boundary by deformation; this linear defect is not part of the equilibrium structure of the grain boundary described in terms of intrinsic dislocations.

Creep

Slow deformation of a material subjected to constant stress.

Grain; grain

Synonym for crystal; any crystalline material consists of an agglomeration of grains, or elementary crystals.

Indice de coïncidence; coincidence index

An index that gives an indication of the order in the region of the grain boundary; the lower the index, the more ordered the boundary. If no disorientation exists between two crystals, $\Sigma =1$...