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GATE 2020 ME (ME2) – Question 21

Engineering Materials · Phase diagrams and heat treatment · 1 mark · Multiple choice

Which statement about a phase diagram is INCORRECT?

  1. It indicates the temperature at which different phases start to melt.
  2. Relative amounts of phases can be found under given equilibrium conditions.
  3. It gives information on transformation rates.
  4. Solid solubility limits are depicted by it.

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Show answer and explanation

Correct answer: (C) It gives information on transformation rates.

Explanation

An equilibrium phase diagram identifies stable phases, boundaries and fractions obtainable by the lever rule. It does not describe kinetic rates, which require time-dependent transformation data. Therefore **transformation rates,C**, is incorrect.