Question

What is meant by ductility? Name two most ductile metals.

Answer 1

Hint: High ductility helps to prevent brittle fracture. Toughness in any metal comes from ductility. Toughness combines strength and ductility in a single property which can be measured. The properties of structural steel result from both its chemical compositions and its method of manufacture, including processing during fabrication. Welding involves locally melting the metal which cools. The cooling can be fast because of the surrounding nature.

Complete answer:
The ability of the metals to be drawn into thin wires is known as ductility. This ductility is a mechanical property of materials. In materials science ductility is known to the degree to which a material can sustain plastic deformation under tensile stress. This ductility is an ability of solid material to deform under tensile stress. The various standards for the grades of steel ion a minimum value for ductility so the design assumptions are valid and if these are specified correctly the designer can be assured of their adequate performance. The greater thickness of material, the greater the reduction of toughness. Ductility of metals decreases as the temperature increases because metals become weak after increasing temperature.
Two most ductile metals are Gold and platinum. Platinum is more ductile than gold. The resistance factor of flammability of gold is five. The most ductile metal is platinum and the most malleable metal is gold.

Note:
Malleability is a physical property of metal. Students get confused between malleability and ductility. By malleability metals can be hammered, shaped and rolled into a very thin sheet without rupturing. Malleability is very important in a metal. All structural steels are essentially wieldable.