Ductility's a mechanical property used to describe the extent to which materials can be deformed plastically without fracture. In material science, ductility specifically refers to a material's ability to deform under tensile stress; this's often characterized by the material's ability to be stretched into a wire. Malleability, a similar concept, refers to a material's ability to deform under compressive stress; this's often characterized by the material's ability to form a thin sheet by hamme… (More on Ductility)