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Asked: 2020-05-10T21:51:14+05:30 In:

GATE MT 2020 Q26. 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.

Poll Results

12.5%Position 1: stable equilibrium; Position 2: unstable; Position 3: stable ( 3 voters )
75%Position 1: unstable equilibrium; Position 2: unstable; Position 3: unstable ( 18 voters )
8.33%Position 1: unstable equilibrium; Position 2: stable; Position 3: unstable ( 2 voters )
4.17%Position 1: stable equilibrium; Position 2: unstable; Position 3: unstable ( 1 voter )
Based On 24 Votes

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GATE MT 2020 Q26. 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.
GATE MT 2020 Q26. 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.
GATE MT 2020 Question Paper With SolutionGATE MT Physical metallurgyGATE MT Previous Year Questions With Solutionslip plane
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    2 Answers

    1. Iron
      This answer was edited.

      Since a verticle array of edge dislocations is a stable state.. So position b will be a stable state

      Since a verticle array of edge dislocations is a stable state.. So position b will be a stable state

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    2. Best Answer
      official account of Askmemetallurgy

      Correct answer is option B.  When two dislocations of same kind on parallel slip plane( when they are one over other, like position 2) stable equilibrium exists. Any dislocation near stress field of dislocation should not be present. Position 1 – dislocation at position 1 is repelled by dislocationRead more

      Correct answer is option B.

      •  When two dislocations of same kind on parallel slip plane( when they are one over other, like position 2) stable equilibrium exists.
      • Any dislocation near stress field of dislocation should not be present.
      • Position 1 – dislocation at position 1 is repelled by dislocation on bottom plane at position X and Y. It can neither go left nor right. Thus, it is unstable.
      • Position 2 – tensile field of dislocation at position 2 is cancelled by compressive field of dislocation at position Y. But it is being repelled by dislocation at position X.
      • Position 3 – dislocation at position 3 is repelled by both dislocation at X and Y.

       

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