finalexamsamplequestions00

finalexamsamplequestions00 - Matsc 503 - Kinetics of...

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Matsc 503 - Kinetics of Materials Processes Sample Final Exam Questions 1. Discuss the three regimes of grain boundary diffusion, A, B and C, as classified by Harrison: (a) (10 points ) Give the conditions for each regime in terms of the spacing between grain boundaries, grain boundary thickness, grain boundary diffusion coefficient, lattice diffusion coefficient, diffusion time, etc. . (b) (10 points) Discuss the possibility of measuring the grain boundary diffusion coefficient in each regime. 2. A solid-solid transformation produces cubic precipitates. The surface energies are γ coh = 0.04 J m -2 for coherent precipitates and γ incoh = 0.40 J m -2 for incoherent precipitates. G v =- 2 × 10 8 T T eq Jm - 3 , T eq = 1000 K and strain energy/unit volume of precipitates G ε = 5 × 10 6 Jm - 3 ; G = 0 for incoherent precipitates (a) Calculate the temperature below which both coherent and incoherent precipitation are thermodynamically possible.
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finalexamsamplequestions00 - Matsc 503 - Kinetics of...

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