MatSci 201 HW5 Solutions 2008

MatSci 201 HW5 Solutions 2008 - MatSci 201: Introduction to...

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MatSci 201: Introduction to Materials Homework #5 Solutions: Due Monday, November 3, 2008 by 5 PM No late homework accepted. Diffusion and Phase Diagrams All questions worth 10 points each, except #6 which is worth 20 points. 1. Callister, Question 5.6 2. Callister, Question 5.14
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3. Callister, Question 5.30 4. You are given three aluminum samples of the same purity: single crystal, polycrystal with an average grain size of 10 microns, and polycrystal with an average grain size of 1 micron. Now you are to measure the self-diffusion coefficient (i.e., diffusion of aluminum atoms in aluminum) for each of these three samples at the same temperature. Rank the three diffusion coefficients. Explain how you arrive at this conclusion.
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Diffusion is faster along grain boundaries than through the bulk of the crystal. There are more grain boundaries available for diffusion in an aluminum polycrystals with 1 micron grain size than that with 10 micron grain size. Therefore, one can conclude the following:
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This note was uploaded on 11/21/2011 for the course MAT SCI 201 taught by Professor Matsci during the Spring '10 term at Northwestern.

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MatSci 201 HW5 Solutions 2008 - MatSci 201: Introduction to...

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