page_title: Ductility
hierarchical_section_title: Ductility
caption_attribution_description: Fractured tensile test specimen of a nodular graphite cast iron. This specimens failed by brittle failure, as seen from the lack of plastic deformation. Note that nodular graphite cast irons are usually ductile, so this specimen is not representative for this class of alloys.
context_page_description: Ductility is when a solid material stretches under tensile strain. If ductile, a material may be stretched into a wire. Malleability, a similar property, is a material's ability to deform under pressure. If malleable, a material may be flattened by hammering or rolling.
  Both of these properties are aspects of plasticity. Plasticity is how far a solid material can be deformed without fracture. These properties are commonplace in metals, and are dependent on temperature and pressure. This was investigated by Percy Williams Bridgman as part of his 1946 Nobel Prize–winning work on high pressures.
  Ductility and malleability do not always go together. Gold has high ductility and malleability, but lead has low ductility and high malleability. The word ductility is sometimes used to embrace both types of plasticity.
  Gold, copper, aluminium, and steel have high ductility.
context_section_description: Ductility is when a solid material stretches under tensile strain. If ductile, a material may be stretched into a wire. Malleability, a similar property, is a material's ability to deform under pressure (compressive stress). If malleable, a material may be flattened by hammering or rolling.  
  Both of these properties are aspects of plasticity.  Plasticity is how far a solid material can be deformed without fracture.  These properties are commonplace in metals, and are dependent on temperature and pressure.  This was investigated by Percy Williams Bridgman as part of his 1946 Nobel Prize–winning work on high pressures.
  Ductility and malleability do not always go together. Gold has high ductility and malleability, but lead has low ductility and high malleability.  The word ductility is sometimes used to embrace both types of plasticity.
  Gold, copper, aluminium, and steel have high ductility.
caption: This tensile test of a cast iron shows low ductility.
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