Question

When are irregular spots in the Laue method formed?

(a) Coarse grains > 0.04 mm

(b) Fine grains 0.004 mm

(c) Very fine grains 0.0004 mm

(d) Cold worked

This question was addressed to me by my school teacher while I was bunking the class.

The query is from Diffraction topic in division Solid Solutions & Crystallography of Engineering Material & Metallurgy

Answer 1

Right answer is (d) Cold worked

The explanation: Laue back reflection method is used for examining and measuring the condition of single crystals or polycrystalline masses. For cold worked metal, the back reflection photograph has an irregular shape and outline of the spots. Cold working, thus, causes the spots to widen radially.