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Mechanical Properties Of Metals
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Mechanical Properties Of Metals
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18 Questions

1. Heating to recovery temperature relieves internal stresses

2. Dislocations are moved into _______ configuration.

3. Strain energy of cold work is stored as dislocations

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

5. Cold worked metals become brittle.

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

7. Recrystallization temperature increases with ______ of metals.

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

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

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

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

12. Smaller the deformation - _______ the recrystallization temperature.

13. Expansion of nucleus and migration of grains.

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

15. 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.

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

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

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

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