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GATE 2025 MT – Question 40

Mechanical Behaviour of Materials · Plasticity and yield criteria · 2 marks · Multiple choice

Match the phenomena in Column I with the typical observations in Column II.

Column I:

P. Dynamic strain aging

Q. Recrystallization

R. Bauschinger effect

S. Superplasticity

Column II:

1. Grain boundary sliding

2. Decrease in yield stress with a reversal of loading direction

3. Decrease in dislocation density

4. Serrations in stress–strain curve

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

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Show answer and explanation

Correct answer: (B) P – 4, Q – 3, R – 2, S – 1

Explanation

Dynamic strain aging produces stress–strain serrations (P4). Recrystallization creates low-dislocation-density grains (Q3). The Bauschinger effect lowers reverse-loading yield stress (R2). Grain-boundary sliding is central to superplasticity (S1). Thus **B**.