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Unformatted text preview: at the surface with the oxygen in the atmosphere; that is, the carbon concentration at the surface position is maintained essentially at 0 wt% C. (This process of carbon depletion is termed decarburization.) At what position will the carbon concentration be 0.15 wt% after a 10-h treatment? The value of D at 1400 K is 6.9x10-11 m2/s. 3 Introduction to Materials Science 6.22 The diffusion coefficients for silver in copper are given at two temperatures: (a) Determine the values of D o and the activation energy Q d . (b) What is the magnitude of D at 875 o C? 6.23 Below is shown a plot of the logarithm (to the base 10) of the diffusion coefficient versus reciprocal of the absolute temperature, for the diffusion of iron in chromium. Determine values for the activation energy and preexponential....
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- Spring '10