Quiz-5-soln

Quiz-5-soln - 3. Why does plastic deformation not occur for...

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Name_____________________________ Team No._______ ENGR 213 Quiz 5 16 OC 02 CLOSED BOOK and NOTES, INDIVIDUAL WORK 1. List the four mechanisms of metal strengthening. 4 pts solid solution alloying grain size reduction precipitation hardening (introducing second phase) cold working/strain hardening 2. Grain growth is a method to restore material properties. What is the driving force for grain growth? 2 pts Increasing grain size lowers the potential energy of the system because of the reduction in surface area If the grain structure is too coarse (ie grains too large) in a single-phase alloy, what procedure can be applied? 2 pts Applying plastic deformation followed by heating to produce recrystallisation
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Unformatted text preview: 3. Why does plastic deformation not occur for some ceramics? 3 pts Noncrystalline ceramics do not have a regular atomic structure, so deformation Occurs by flow rather than dislocation movement 4. What is the glass transition temperature (1 pt), its typical range of values (1 pt), and describe why a polymer must be at a higher temperature in order to elastically deform (2 pts). Where elastomers change from brittle to ductile behavior About 50 and 90 deg C or 60 and 130 deg F The polymer molecules must have enough thermal energy to be able to slip by each other as they are stretched...
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This homework help was uploaded on 03/26/2008 for the course ENGR 213 taught by Professor Dr.stubbs during the Fall '04 term at Texas A&M.

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