Question

What is the CRSS value of a copper crystal?

(a) 0.5

(b) 0.75

(c) 5

(d) 15

I have been asked this question in an international level competition.

The origin of the question is Plastic Deformation topic in division Plastic Deformation and Creep in Crystalline Materials, Elastic, Anelastic and Viscoelastic Behaviour of Engineering Material & Metallurgy

Answer 1

Right option is (a) 0.5

To explain: CRSS is defined as the critical resolved shear stress of a material. For a copper crystal, it has an FCC structure and a CRSS value of 0.5. The CRSS values for aluminum, nickel, and iron and 0.75, 5, and 15 correspondingly.