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Problem Sheet 3.pdf

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Course Code
ENG 2002
Hany E.Z.Farag

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Assignment #3: Imperfections and Diffusion o 1. Calculate the fraction of atom sites that are vacant for lead at its melting temperature of 327 C. Assume an energy for vacancy formation of 0.55 eV/atom. 2. Calculate the activation energy for vacancy formation in aluminum, given that the equilibrium number of vacancies at 500 C is 7.57x10 23m . The atomic weight and density (at 500 oC) for 3 aluminum are, respectively 26.98 g/mol and 2.62 g/cm . 3. What is the composition, in atom percent, of an alloy that cons ists of 30 wt% Zn and 70 wt% Cu? 4. For an ASTM grain size of 8, approximately how many grains would there be per square inch (a) at a magnification of 100x, and (b) without any magnification? 5. Co
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