test22002solutions - Kinetics of Materials Processes -...

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Kinetics of Materials Processes - Solutions to Test 2 April 8, 2002 Problem 1 (35 points) a. Self-diffusion in a pure solid is not correlated, but tracer diffusion is correlated: true or false? True b. Vacancy diffusion in a pure solid is correlated: true or false? False c. For a binary system A-B, the interdiffusion coefficient is always the same for A atoms and B atoms: true or false? True d. Are the intrinsic diffusion coefficients defined on the lattice reference system or lab reference system? Lattice e. Diffusion takes place always down the chemical potential gradient: true or false? True f. Diffusion takes place always down the concentration gradient: true or false? False g. Which diffusion coefficient is calculated from the Boltzmann-Matano analysis: (i) the intrinsic diffusion coefficient, (ii) the self-diffusion coefficient, or (iii) the interdiffusion coefficient? Interdiffusion coefficient h. Is diffusion along extended defects such as grain boundaries and surfaces more important relative to the bulk diffusion: (i) at high temperatures or (ii) at low temperatures? Low temperatures
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This note was uploaded on 01/19/2010 for the course MAT SCI 503 taught by Professor Chen during the Spring '02 term at Pennsylvania State University, University Park.

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test22002solutions - Kinetics of Materials Processes -...

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