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quiz3spr2000 - respectively 4 What is the activation ener~...

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~- ". ". , ,,;,,"", ."y~ ENGSC 3313, Spring 2000 Quiz3 Name ~ ~~ Consider a { lOO } face. If R is the FCC metal atom size If r is the C atom size then 4R = .J2a 2R+2r = a r = 0.071 nm, hence a = 0.484 nm 2. I showed this diagram on the overhead projector! What sQecifically is it a representation of? ExQlain! A ~ dislocation. It is a line discontinuity. The atoms fonn one continuous plane. As oriented, the planes spiral upwards about a vertical axis through the center of the sketch. The micrograph below shows the crystal grains in a metal of ~. Please determine the ASTM grain size number. 3 I .J", ~ ).-i.. i. ,~ I count .!QQ.Y! 16 grains per square inch (drawn). Thus, at 100x, I would count -4 4 = N = 2n-l = 22 n=3
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Unformatted text preview: respectively. 4. What is the activation ener~ for diffusion if the diffusion rate doubles between 100°C and 120°C? The gas constant is 8.31 J mole.- K-1 5, D = Doe-Q/RT Dl = Doe-Q/S.3l (373) Solving Q = 42.2kJ/mole There is one activation energy quoted for self diffusion in FCC aluminum, so how many are quoted for self diffusion in a) diamond, b) graphite? 6. I expect you to recognize that diamond has a ~ crystal structure and graphite a hexagonal structure, because I have used them often for illustrations of properties. Here diamond, a = b = c, need 1 Here graphite, a = a * c, need 2...
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