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