Ductility
Ductility can be quantified by the fracture strain formula_1, which is the engineering strain at which a test specimen fractures during a uniaxial tensile test. Another commonly used measure is the reduction of area at fracture formula_2. The ductility of steel varies depending on the alloying constituents. Increasing the levels of carbon decreases ductility. Many plastics and amorphous solids, such as Play-Doh, are also malleable.
The most ductile metal is platinum and the most malleable metal is gold.
Metal furniture
Wrought iron is good for garden furniture, providing a classic look. However, it is heavy, which is a challenge, but appreciated on windy days. It needs much care, though, and can easily rust and corrode if not waterproofed. Aluminum is more common than steel furniture, mostly because it does not rust, although it oxidizes, turning into a chalky white. It is also lighter than steel, making it more desirable. Cast and heavy tube aluminum give better quality. Aluminum has to be thicker than steel if it is to have as much strength. Tubular aluminum is flexible and hollowing, besides less sturdy. However, its lightness makes for an ideal poolside furniture and is mainly used for benches, folding chairs and swing sets.