Question

Creep occurs at a temperature above ________

(a) 0.16 Tm

(b) 0.22 Tm

(c) 0.4 Tm

(d) 0.91 Tm

The question was posed to me during an interview.

I want to ask this question 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

Right option is (c) 0.4 Tm

The explanation: Creep is defined as the permanent deformation of a material due to the application of steady load. It is appreciable only at temperatures above 0.4 Tm.