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GATE 2016 ME (ME2) – Question 31

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

In the phase diagram shown in the figure, four samples of the same composition are heated to temperatures marked by a, b, c and d. At which temperature will a sample get solutionized the fastest?

Diagram for GATE 2016 ME (ME2) question 31
  1. a
  2. b
  3. c
  4. d

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Show answer and explanation

Correct answer: (C) c

Explanation

Solution treatment requires the single-phase solid α region so the second phase can dissolve without melting. Point c lies in this region and provides a higher diffusion rate than the lower two-phase temperatures. Point d enters liquid-containing conditions and is not a suitable solid solution-treatment choice. Hence **c, C**.