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Test your basic knowledge |
Mechanical Properties Of Metals
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Study First
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. Strain energy of cold work is stored as dislocations
Stages of Annealing Recovery
Structure of Cold Worked Metals
Higher ductility
Deformation
2. 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.
Factors Affecting Recrystallization
Recrystallization temperature
Two mechanisms of recrystallization
Stages of Annealing Recovery
3. Expansion of nucleus and migration of grains.
Deformation
Purity
Higher ductility
Two mechanisms of recrystallization
4. Recrystallization temperature increases with ______ of metals.
Stages of Annealing Recrystallization
Two mechanisms of recrystallization
Annealing
Purity
5. Heating to recovery temperature relieves internal stresses
Polygonization
Purity
Recovery Stage
Recrystallization
6. If metal is held at recrystallization temperature long enough - cold worked structure is completely replaced with recrystallized grain structure.
Recrystallization
Higher
Deformation
Stages of Annealing Recrystallization
7. Cold worked metals become brittle.
Recovery Stage
Recovery and Recrystallization
Factors Affecting Recrystallization
Higher ductility
8. Because the number of dislocation is greatly reduced - the recrystallized metal has _________ but lower strength.
Higher ductility
Recovery Stage
Factors Affecting Recrystallization
Lower energy
9. Recrystallization occurs by the nucleation and growth of new grains containing few dislocations.
Structure of Cold Worked Metals
Two mechanisms of recrystallization
Stages of Annealing Recrystallization
Lesser
10. Reheating - which increases ductility results in recovery - recrystallization and grain growth. This is call ______ and changes material properties.
Annealing
Recrystallization temperature
Stages of Annealing Recrystallization
Lower energy
11. Approximately 0.4 times the absolute melting temperature to induce rapid recovery.
Purity
Recrystallization temperature
Recovery and Recrystallization
Deformation
12. Greater the degree of deformation - _________ are the recrystallized grains.
Smaller
Lesser
Recovery Stage
Higher
13. For Recrystallization - A minimum amount of _______ is needed.
Recovery Stage
Lower energy
Polygonization
Deformation
14. Smaller the deformation - _______ the recrystallization temperature.
Stages of Annealing Recrystallization
Purity
Recovery and Recrystallization
Higher
15. Dislocations are moved into _______ configuration.
Lower energy
Stages of Annealing Recrystallization
Smaller
Stages of Annealing Recovery
16. Formation of sub- grain structure) takes place.
Structure of Cold Worked Metals
Higher
Two mechanisms of recrystallization
Polygonization
17. Amount of prior deformation - Temperature and time - Initial grain size - Composition of metal.
Stages of Annealing Recrystallization
Higher ductility
Stages of Annealing Recovery
Factors Affecting Recrystallization
18. Higher the temperature - is the time required for recrystallization.
Lesser
Factors Affecting Recrystallization
Smaller
Structure of Cold Worked Metals