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






2. Heating to recovery temperature relieves internal stresses






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






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






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






6. Cold worked metals become brittle.






7. Dislocations are moved into _______ configuration.






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






9. Smaller the deformation - _______ the recrystallization temperature.






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






11. 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.






12. Strain energy of cold work is stored as dislocations






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






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






15. Recrystallization temperature increases with ______ of metals.






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






17. Expansion of nucleus and migration of grains.






18. Formation of sub- grain structure) takes place.