Question

Generation of dislocations can be identified using _______

(a) Schottky mechanism

(b) Burger’s vector

(c) Twist

(d) Frank-Read mechanism

I have been asked this question in unit test.

I want to ask this question from Crystal Defects in division Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

Answer 1

Right answer is (d) Frank-Read mechanism

For explanation I would say: The Frank-Read mechanism uses the Frank-Read source and its operation as a dislocation multiplier. The Frank-Read source contains a fixed lined at the X and Y nodes. Under the application of stress, the dislocation line expands and is further operated until it becomes readable.