Unformatted text preview: (a) What does the concentration c α indicated on the graph represent? (b) Determine the coordinate of the Matano interface; then calculate the diffusion coefficient by the Matano method for the concentration c = 0.2wt.%. (c) Assuming that the diffusion coefficient is constant, find the solution c(x) of Fick's second equation for the boundary conditions implied by the concentrationpenetration curve. (d) Assume that the boundary of the twophase region is displaced by a distance ξ during the time t, and that this process is diffusioncontrolled, i.e. = 2 Dt , where is a constant. (i) Write the equation connecting the conservation of matter at the plane x = during the time dt to the displacement (d ) of the boundary of the twophase region. (ii) From the equation obtained above, deduce the diffusion coefficient D. Compare this value with the one calculated by the Matano method....
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 Spring '02
 CHEN
 Austenite, Fick, diffusion coefficient D., 900 J, 84,100 J

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