Metallurgical Engineering > GATE 2020 > Dislocation
In the edge dislocation configuration given in the figure, dislocations X and Y are fixed and separated by a distance 2h on the same slip plane. Dislocation Z is free to glide on a parallel slip plane. The two slip planes are separated by a distance h. Which one of the following statements is TRUE regarding the stability of dislocation Z at positions 1, 2 and 3?
Assume all dislocations have identical Burgers vector.
A
Position 1: unstable equilibrium; Position 2: unstable; Position 3: unstable
B
Position 1: stable equilibrium; Position 2: unstable; Position 3: unstable
C
Position 1: unstable equilibrium; Position 2: stable; Position 3: unstable
D
Position 1: stable equilibrium; Position 2: unstable; Position 3: stable

Correct : a

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