Ductility is a mechanical property used to describe the extent to which materials can be deformed without fracture. Examples of highly ductile metals are silver, gold, copper, and aluminium. The ductility of steel varies depending on the alloying constituents. Increasing levels of carbon decreases ductility, for example, the steel becomes more brittle. Definition of ductility Ductility can be quantified by the fracture strain, which is the strain at which a test specimen breaks during a unia… (More on Ductile)