Ductility

Ductility

• A. The amount of plasticity that precedes failure.
• B. The measure of a material's magnetic properties.
• C. The thermal expansion coefficient.
• D. The speed of sound in a material.

Answer: (A)

Ductility is the ability of a material to undergo plastic deformation before it fractures. In practical terms, that means how much it can stretch or be shaped after yielding before it breaks, often quantified by measures like percent elongation or reduction of area in a tensile test. This concept is what sets ductile metals apart from brittle ones, which fail with little or no plastic deformation. The option that describes the amount of plasticity that precedes failure directly captures this idea, making it the best choice. The other statements refer to magnetic properties, thermal expansion, or the speed of sound in a material, none of which describe how much plastic deformation a material can sustain before failing.

Ductility is the ability of a material to undergo plastic deformation before it fractures. In practical terms, that means how much it can stretch or be shaped after yielding before it breaks, often quantified by measures like percent elongation or reduction of area in a tensile test. This concept is what sets ductile metals apart from brittle ones, which fail with little or no plastic deformation. The option that describes the amount of plasticity that precedes failure directly captures this idea, making it the best choice. The other statements refer to magnetic properties, thermal expansion, or the speed of sound in a material, none of which describe how much plastic deformation a material can sustain before failing.