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GATE 2026 MT – Question 17

Mechanical Behaviour of Materials · Creep · 1 mark · Multiple choice

Deformation mechanism map of a given material is used for determining which one of the following properties?

  1. Fatigue strength
  2. Creep rate
  3. Tensile strength
  4. Impact toughness

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Show answer and explanation

Correct answer: (B) Creep rate

Explanation

A deformation-mechanism map plots normalized stress against homologous temperature, marking dominant mechanisms and often contours of constant strain rate. It distinguishes diffusion creep, dislocation creep and related regimes, enabling estimation of the **creep rate, B**, rather than fatigue strength or impact toughness.