Exam 1 Final Final - ENME 382 Engrg Matls and Mfrg...

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ENME 382 Name _________________________________ Engrg Matls and Mfrg Processes March 10, 2004 There are 12 questions. You have 60 minutes for the exam. Place the answer in the space provided. Show all your work for partial credit. 1. Match the defect with the definition (10 pts) _________ Schottky Defect A. An normally occupied lattice site from which the atom is missing. ________ Vacancy B. Positive ion vacancy combined with a negative ion vacancy _________ Interstitial C. A region of disorder between grains that can be modeled as a series of edge dislocations _________ Twist Boundary D. A region of disorder between grains that can be modeled as a series of screw dislocations _________ Tilt Boundary E. An atom placed at a location in the crystal lattice that is normally empty. 2. For each property in the table below, rank the material groups on a scale of 1-3 from highest (1) to lowest (3). (12 points) Yield Strength % Elongation Toughness Elastic Modulus Metals Ceramics Polymers
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3. Crystal Structure (4 pts). a. Considering only the grey atoms in the
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Exam 1 Final Final - ENME 382 Engrg Matls and Mfrg...

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