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Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.
Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.
Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'C'. Can you explain this answer?
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Assertion (A): Plastic deformation in metals and alloys is a permanent...
Ans. (c) The deformation of metals, which is caused by the displacement of the atom is
achieved by one or both of the processes called slip and twinning.
achieved by one or both of the processes called slip and twinning.
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Assertion (A): Plastic deformation in metals and alloys is a permanent...
Plastic Deformation in Metals and Alloys
Assertion (A): Plastic deformation in metals and alloys is a permanent deformation under load. This property is useful in obtaining products by cold rolling.
Reason (R): Plastic or permanent deformation in metal or alloy is caused by movement or dislocations.
The correct answer is option 'C', which states that Assertion (A) is true but Reason (R) is false.
Explanation:
Plastic deformation in metals and alloys refers to the change in shape and size of a material when subjected to an external force or load. Unlike elastic deformation, which is temporary and reversible, plastic deformation is permanent. This property is essential in various manufacturing processes, such as cold rolling, where the material is intentionally deformed to obtain the desired shape or dimensions.
Plastic Deformation and Dislocations:
One of the primary mechanisms responsible for plastic deformation in metals and alloys is the movement or motion of dislocations. Dislocations are line defects or irregularities in the crystal lattice structure of a material. When an external force is applied, these dislocations move and interact with each other, leading to the permanent deformation of the material.
Role of Dislocations in Plastic Deformation:
When an external force is applied to a metal or alloy, it causes the dislocations to move along the slip planes within the crystal structure. This movement of dislocations allows the material to undergo plastic deformation. The dislocations can move due to the breaking and reforming of atomic bonds along the slip planes.
Cold Rolling and Plastic Deformation:
Cold rolling is a metalworking process where a sheet or strip of metal is passed through rollers to reduce its thickness or change its shape. During cold rolling, the material is subjected to compressive forces, which cause plastic deformation. The dislocations within the material move and rearrange, resulting in a permanent change in shape.
Conclusion:
Plastic deformation in metals and alloys is indeed a permanent deformation under load. This property is crucial in manufacturing processes like cold rolling. The movement of dislocations within the material is responsible for plastic deformation. However, the given Reason (R) incorrectly states that plastic deformation is caused solely by the movement of dislocations, which is not true. Other mechanisms, such as twinning and grain boundary sliding, also contribute to plastic deformation in metals and alloys. Hence, Assertion (A) is true, but Reason (R) is false.
Assertion (A): Plastic deformation in metals and alloys is a permanent deformation under load. This property is useful in obtaining products by cold rolling.
Reason (R): Plastic or permanent deformation in metal or alloy is caused by movement or dislocations.
The correct answer is option 'C', which states that Assertion (A) is true but Reason (R) is false.
Explanation:
Plastic deformation in metals and alloys refers to the change in shape and size of a material when subjected to an external force or load. Unlike elastic deformation, which is temporary and reversible, plastic deformation is permanent. This property is essential in various manufacturing processes, such as cold rolling, where the material is intentionally deformed to obtain the desired shape or dimensions.
Plastic Deformation and Dislocations:
One of the primary mechanisms responsible for plastic deformation in metals and alloys is the movement or motion of dislocations. Dislocations are line defects or irregularities in the crystal lattice structure of a material. When an external force is applied, these dislocations move and interact with each other, leading to the permanent deformation of the material.
Role of Dislocations in Plastic Deformation:
When an external force is applied to a metal or alloy, it causes the dislocations to move along the slip planes within the crystal structure. This movement of dislocations allows the material to undergo plastic deformation. The dislocations can move due to the breaking and reforming of atomic bonds along the slip planes.
Cold Rolling and Plastic Deformation:
Cold rolling is a metalworking process where a sheet or strip of metal is passed through rollers to reduce its thickness or change its shape. During cold rolling, the material is subjected to compressive forces, which cause plastic deformation. The dislocations within the material move and rearrange, resulting in a permanent change in shape.
Conclusion:
Plastic deformation in metals and alloys is indeed a permanent deformation under load. This property is crucial in manufacturing processes like cold rolling. The movement of dislocations within the material is responsible for plastic deformation. However, the given Reason (R) incorrectly states that plastic deformation is caused solely by the movement of dislocations, which is not true. Other mechanisms, such as twinning and grain boundary sliding, also contribute to plastic deformation in metals and alloys. Hence, Assertion (A) is true, but Reason (R) is false.
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Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?
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Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?.
Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?.
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ample number of questions to practice Assertion (A): Plastic deformation in metals and alloys is a permanentdeformation under load. This property is useful in obtaining products by coldrolling.Reason (R): Plastic or permanent deformation in metal or alloy is caused bymovement or dislocations.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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