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Tensile test of an AlMgSi alloy. The local necking and the cup and cone fracture surfaces are typical for ductile metals.
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This tensile test of a nodular cast iron demonstrates low ductility.

In materials science, ductility is a solid material's ability to deform under tensile stress; this is often characterized by the material's ability to be stretched into a wire. Malleability, a similar property, is a material's ability to deform under compressive stress; this is often characterized by the material's ability to form a thin sheet by hammering or rolling. Both of these mechanical properties are aspects of plasticity, the extent to which a solid material can be plastically deformed without fracture. Also, these material properties are dependent on temperature and pressure (investigated by Percy Williams Bridgman as part of his Nobel Prize–winning work on high pressures).

Ductility and malleability are not always coextensive – for instance, while gold has high ductility and malleability, lead has low ductility but high malleability.<ref name="mms">{{#invoke:citation/CS1|citation |CitationClass=book }}.</ref> The word ductility is sometimes used to encompass both types of plasticity.<ref> Includes definitions from American Heritage Dictionary of the English Language, Collins English Dictionary: Complete and Unabridged, American Heritage Science Dictionary, and WordNet 3.0.</ref>

Ductility sections
Intro   Materials science   [[Ductility?section=Ductile\u2013brittle_transition_temperature{{safesubst:#invoke:anchor|main}}|Ductile\u2013brittle transition temperature{{safesubst:#invoke:anchor|main}}]]  See also  References  External links  

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