EXERCISE 3 The rates of linear growth of aluminium crystals during the recrystallization of cold worked aluminium are as follows Temperature °C Rate (mm/s) 200 250 300 400 5.62 x 10 10 1.38 x 10 1.35 x 10 1.82 x 10 Show numerically that these results are consistent with the Arrhenius law and, if so, calculate the activation energy of the process.

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EXERCISE 3
The rates of linear growth of aluminium crystals during the recrystallization of cold worked
aluminium are as follows
ww ww
Temperature °C
Rate (mm/s)
200
250
300
400
5.62 x 10 10
1.35 x 10
1.82 x 10
Show numerically that these results are consistent with the Arrhenius law and, if so, calculate the
activation energy of the process.
EXERCISE 4
The times for a 50% recrystallization of pure copper are 1 minute at 162 C and 1,000 minutes at 72
"C. Estimate the time for 50% recrystallization at 20 °C. Discuss what changes you expect to occur in
the mechanical properties of a cold worked copper over a period of 10 years.
Transcribed Image Text:EXERCISE 3 The rates of linear growth of aluminium crystals during the recrystallization of cold worked aluminium are as follows ww ww Temperature °C Rate (mm/s) 200 250 300 400 5.62 x 10 10 1.35 x 10 1.82 x 10 Show numerically that these results are consistent with the Arrhenius law and, if so, calculate the activation energy of the process. EXERCISE 4 The times for a 50% recrystallization of pure copper are 1 minute at 162 C and 1,000 minutes at 72 "C. Estimate the time for 50% recrystallization at 20 °C. Discuss what changes you expect to occur in the mechanical properties of a cold worked copper over a period of 10 years.
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