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Mechanical Properties Of Metals

Subject : engineering
Instructions:
  • Answer 18 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Formation of sub- grain structure) takes place.






2. Amount of prior deformation - Temperature and time - Initial grain size - Composition of metal.






3. Reheating - which increases ductility results in recovery - recrystallization and grain growth. This is call ______ and changes material properties.






4. Recrystallization occurs by the nucleation and growth of new grains containing few dislocations.






5. Higher the temperature - is the time required for recrystallization.






6. Greater the degree of deformation - _________ are the recrystallized grains.






7. Cold worked metals become brittle.






8. Heating to recovery temperature relieves internal stresses






9. Because the number of dislocation is greatly reduced - the recrystallized metal has _________ but lower strength.






10. Dislocations are moved into _______ configuration.






11. Smaller the deformation - _______ the recrystallization temperature.






12. Additional thermal energy permits disloctions to move and form boundaries of a polygonized subgrain structure. From a practical point of view - the principal change in the metal during recovery is the reduction of stresses.






13. Expansion of nucleus and migration of grains.






14. If metal is held at recrystallization temperature long enough - cold worked structure is completely replaced with recrystallized grain structure.






15. For Recrystallization - A minimum amount of _______ is needed.






16. Strain energy of cold work is stored as dislocations






17. Approximately 0.4 times the absolute melting temperature to induce rapid recovery.






18. Recrystallization temperature increases with ______ of metals.







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