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# HW-02 - if the lattice parameter of FCC aluminum is 0.4049...

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1 VK 250 Summer 2008 Homework 2 (Due on Friday, July 11, 2008) 1. Callister (Textbook, 7 th edition), Page 74, Question 3.13. 2. Callister (Textbook, 7 th edition), Page 75, Question 3.17. 3. Callister (Textbook, 7 th edition), Page 76, Question 3.31. 4. Callister (Textbook, 7 th edition), Page 106, Question 4.3. 5. It is possible to measure the density of a material to a high degree of accuracy (4 significant figures). A sample of aluminum cooled rapidly from a temperature just below the melting point has a density of 2.698 g/cm 3 . This is lower than the theoretical density of Al, due to the presence of vacancies. Determine the fraction of atomic sites occupied by vacancies
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Unformatted text preview: if the lattice parameter of FCC aluminum is 0.4049 nm. The atomic weight of Al is 26.98 g/mol. 6. A cube of annealed copper measuring 1 cm on each side contains a dislocation density of 10 8 /cm 2 . The dislocations exist in the form of circular loops that have an average radius of 50 nm. How many dislocation loops are present in this block of material? 7. Callister (Textbook, 7 th edition), Page 304, Question 9.8. 8. Callister (Textbook, 7 th edition), Page 307, Question 9.43. 9 . Callister (Textbook, 7 th edition), Page 309, Question 9.51. 10. Callister (Textbook, 7 th edition), Page 126, Question 5.3....
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