(Multiple choice) Which one of the following statements is true? (a) According t

Question

(Multiple choice)

             Which one of the following statements is true?

             (a) According to the Hall-Petch equation, Ostwald ripening follows the empirical rule: where n and K are material-dependent constants, t denotes time,  d denotes average grain diameter at time t, and d0denotes initial average grain diameter.

             (b) The recrystallization temperature of brass is higher than the recrystallization temperature of copper.

             (c) The recrystallization temperature of bronze is lower than the recrystallization temperature of copper.

             (d) Recrystallization cannot occur at room temperature.

             (e)   When a cold worked material is annealed, the microstructure at time t2 is coarser than the microstructure at time t1, if  t2 > t1.

Explanation / Answer

a, c and e are three true statements

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.