Mid-term 03 - NAME: _ MATERIALS SELECTION 530.352 FALL...

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NAME: ________________________________ MATERIALS SELECTION FALL SEMESTER 530.352 PROF. K.J. HEMKER MID-TERM EXAMINATION (Closed book - closed notes - open mind) October 21 st , 2003 1. Most metals and ceramics have a crystalline microstructure, complete the following two exercises to show your command of crystal planes and directions. (20 points) i) Using the cube below, draw in the atoms for a bcc crystal structure. Dislocations move on {110}-type planes and have Burgers vectors along the close packed direction in those planes. Draw and label the (-110) plane and draw and highlight a Burgers vector in that plane. x y z ii) Using the cube below, draw in the atoms for an fcc crystal structure. Dislocations move on {111}-type planes and have Burgers vectors along the close-packed directions in these planes. Draw and label the (11-1) plane and highlight a Burgers vector in that plane x y z 2. Circle the word or complete the phrase that makes the following statements true. (20 points) 530.352 Materials Selection Mid-term Exam Page 1 of 8 b = a / 2 [ , , ] b = a / 2 [ , , ]
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i) The Young’s modulus for steel is (greater, about the same, less) than for PMMA? ii) Refractory metals (e.g. W, Ta, Mo), which are well known for their high melting temperatures and high strength, are [bcc, fcc, simple cubic]. iii) Polymers are attractive engineering materials because they are [low cost, easy to shape, corrosion resistant, able to be colored, all of the above]? iv)
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Mid-term 03 - NAME: _ MATERIALS SELECTION 530.352 FALL...

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