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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.

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.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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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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