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Quiz1 Solutions

Quiz1 Solutions - NAME ME 2820 ‘ QUIZ#1 Instructions This...

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Unformatted text preview: NAME: ME 2820 ‘ March 21, 2008 QUIZ #1 \ Instructions: This Is a closed book quiz. Fill in the blanks; circle the answer, or give your answer in the space pro video’. Please be sure to write your name above. 1. The four types of materials are: — 10 pts. a Metals, non-metals, intermediates, composites 6; Metals, ceramics, polymers, composites c) Ionic, covalent, metallic, secondary d) None of the above 2. APF for FCC is the APF for BCC - 10 pts. 6» Larger than b) Smaller than c) Equal to d) Depends on the element 3. The yield strength of a metallic material is the: — 10 pts. a) Maximum stress that a material can withstand without fracture b) Stress level at the fracture point @ Maximum stress that a material can withstand before plastic deformation d) Stress at maximum ductility e) None of the above 4. Plastic deformation in metallic alloys occurs primarily by: — 10 pts. a) Diffusion b) Brittle cleavage © Slip cl) Polymorphic transformations e) Inelastic forces 5. What are the four strengthening mechanisms in metallic alloys — 10 pts. a) WWk MYJQM lg 2W smith: é’fmfifiwfi c) bw d) C(mi'n 57an 9f% air/2:7 6. Obstruction of dislocation motion in a polycrystalline metal will — 10pt5. Decrease the strength of the metal Increase the strength of the metal c) Will not have an effect d) None of the above 7. Cold work is a means of - 10 pts. a) Increasing dislocation density of the metal b) Strain hardening the metal c Strengthening the metal All of the above (a through c) e) None of the above 8. What are the four types of imperfections in crystals? Give an example of each — 10 pts. a) Point dflal’s Examplewfimd “W WI“??? flaw; I‘ “661”“ - ‘ ‘ M M w} c) WNW m Example. Mfe/YM éwa—eég 3m [like 5 l .3; d) Bulk Im%mrms Example: V0403; IN/(Ltfiwns; 9. By annealing one can reverse plastic deformation effects. What are the three stages of annealing? - 10 pts. 1. ' early" 2. 1' . IBM 3. in i3 10. A casting with high volume-to-surface area ratio (V/A) cools and solidifies - 10 pts. @Slower than one with a low V/A ratio - Faster than one with a low V/A ratio c) At the same rate d) Depends on the material ...
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