(Multiple choice) Which one of the following statements is true? Please EXPLAIN
ID: 2997653 • Letter: #
Question
(Multiple choice)
Which one of the following statements is true? Please EXPLAIN
(a)According to the Hall-Petch equation, Ostwald ripening follows the empirical rule:
(d^n)-(d^n(not))=Kt
where n and K are material-dependent constants, t denotes time, d denotes average grain
diameter at time t, and d0 denotes 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
c)because bronze is alloy of copper
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