Aluminium encyclopaedia

Ductility

Ductility is the ability or behaviour of a material under the influence of external forces to undergo plastic and thus permanent deformation without breaking. Such a material is readily cold-workable, for example by deep drawing, bending or stretching.

In geology the term is used to describe rocks, especially those from the Earths lower continental crust, that deform in a plastic and not a brittle manner under tectonic stress.