Sample Exam 1 - EMA 3010 TIME 50 MINUTES; MAE B 211 12.50 -...

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EMA 3010 TIME 50 MINUTES; MAE B 211 12.50 - 1.40 am. Wednesday Feb 11, 09 CLOSED BOOK; ANSWER ALL QUESTIONS; FORMULAS AND CONSTANTS ARE GIVEN BELOW; YOU ARE ALLOWED TO BRI NG A CALCULATOR 1: Iron has a bcc structure below 912 C and changes to a fcc structure above this temperature. The atomic radii of the iron atoms in the 1.26 and 1.29 A for bcc and fcc strctures respectively. (A)What is the number of atoms per unit cell in iron at 750 C and 950 C. [ 5 points] (B) If the atoms in bcc iron are denoted as (0,0,0) and (1/2,1/2,1/2) what is location of atoms in fcc iron. [ 5 points ] (c)What is the lattice parameter of the Iron at 750 C { 10 points} (C) What is the (100) planar density of bcc iron. { 10 points}
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(E) If chromium has a bcc structure similar to iron. What other characteristics it must have so that it is completely soluble in iron. [ 10 points] (F) You are conducting an X-ray diffraction analysis of a piece of bcc iron. Show how the x-ray spectra will be different in you have a nanocystalline
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Sample Exam 1 - EMA 3010 TIME 50 MINUTES; MAE B 211 12.50 -...

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