Mae20 midterm_SAMPLE EXAM

Mae20 midterm_SAMPLE EXAM - 1 Summer, 2008 SAMPLE EXAM MAE...

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1 Summer, 2008 SAMPLE EXAM MAE 20, Elements of Materials Science Mid –term Exam 1. One page of notes/formula sheet allowed 2. The number of points is indicated next to the question Question 1 Define the term: atomic packing fraction. Show that the atomic packing fraction for a body-centered cubic (bcc) crystal is 0.68 (or 68%) (10 points) Question 2 (a) Determine the indices for the directions shown in the following cubic unit cell (8 points):
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2 (b) Determine the Miller indices for the planes shown in the following unit cell (8 points): Question 3 Give a reason why covalently bonded materials are generally less dense than ionically or metallically bonded materials? (6 points) Question 4 Calculate the number of octahedral interstitial sites that uniquely belong to a face centered cubic unit cell? What are their co-ordinates? (7 points)
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3 Question 5 Calculate the concentration of vacancies in copper at room temperature (25 o C). What temperature will be needed to heat treat copper such that the concentration of
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Mae20 midterm_SAMPLE EXAM - 1 Summer, 2008 SAMPLE EXAM MAE...

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