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GATE 2022 MT – Question 41

Mechanical Behaviour of Materials · Dislocations and strengthening · 2 marks · Multiple choice

Match phenomena with descriptions.

Column I:

P. Cottrell atmosphere

Q. Suzuki interaction

R. Bauschinger effect

S. Nabarro–Herring creep

Column II:

1. Yield stress decreases when loading direction reverses

2. Stress-assisted vacancy diffusion produces plastic deformation in a polycrystalline material

3. Lüders bands

4. Solute segregation to the stacking fault

  1. P − 1, Q − 2, R − 3, S − 4
  2. P − 1, Q − 2, R − 4, S − 3
  3. P − 3, Q − 4, R − 1, S − 2
  4. P − 3, Q − 1, R − 4, S − 2

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Show answer and explanation

Correct answer: (C) P − 3, Q − 4, R − 1, S − 2

Explanation

Cottrell atmospheres pin dislocations and produce yield-point/Lüders behavior. Suzuki interaction segregates solutes to stacking faults. Bauschinger effect lowers reverse yield stress; Nabarro–Herring creep uses stress-assisted vacancy diffusion.

Hence P-3,Q-4,R-1,S-2, **C**.