Question

__________ experiences creep at room temperature.

(a) Iron

(b) Copper

(c) Nickel

(d) Lead

The question was posed to me in an internship interview.

My question is taken from Mechanisms of Creep & Creep Resistant Materials in chapter Plastic Deformation and Creep in Crystalline Materials, Elastic, Anelastic and Viscoelastic Behaviour of Engineering Material & Metallurgy

Answer 1

Correct choice is (d) Lead

To explain I would say: Room temperature is about the same as that of the melting point of lead. Therefore, nickel experiences creep at that temperature under its own load. The room temperature of iron and copper is 0.16 Tm and 0.22 Tm respectively, at which creep does not occur.