Recovery, Recrystallization, and Grain Growth MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Recovery, Recrystallization, and Grain Growth”.

1. When a material is plastically deformed at low temperature(around 25 degrees) relative to the melting temperature, which of the following change isn’t observed?
a) Change in grain shape
b) Strain hardening
c) Decrease in dislocation density
d) Increase in dislocation density

2. At which of the following temperature can recovery occur? (where Tm is melting point)
a) 0.2Tm
b) 0.4Tm
c) 0.5Tm
d) 0.6Tm

3. In which of the following processes does recovery, recrystallization, grain growth take place?
a) Surface hardening
b) Tempering
c) Strengthening
d) Annealing

4. Strain-relief crystallization takes place when deformed metals are heated.
a) True
b) False

5. By what percentage can the hardness decrease after strain-relief crystallization?
a) 12%
b) 5%
c) 8%
d) 17%

6. Which of the following processes can be used to refine the grain structure?
a) Recovery
b) Recrystallization
c) Grain growth
d) Such a process does not exist.

7. Which of the following statements are false in strain-relief crystallization?
a) Dislocation climb
b) Decrease in the electric resistance
c) Increase in density
d) Interaction of like signed dislocation

8. In which of the following metal polygonization rarely takes place?
a) Copper
b) Iron
c) Aluminium
d) Molybdenum

9. Lowest temperature for recrystallization for iron is 270°C
a) True
b) False

10. Which of the following is false for grain growth?
a) The grains start growing
b) Grain growth accelerates with increase in temperature
c) Decrease in free energy
d) Increase of surface energy

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