Statement (I): Pursuant to plastic deformation of metals, the mechanical properties of the metals get changed. Statement (II): Mechanical properties of metals depend on grain size also which gets changed by plastic deformation.

Both Statement I) and Statement II) are individually true and Statement II) is the correct explanation of Statement I)

Both Statement I) and Statement II) are individually true but Statement II) is not the correct explanation of Statement I)

Statement I) is true but Statement II) is false

Statement I) is false but Statement II) is true

Statement (I): Pursuant to plastic deformation of metals, the mechanical properties of the metals get changed. Statement (II): Mechanical properties of metals depend on grain size also which gets changed by plastic deformation. Correct Answer Both Statement I) and Statement II) are individually true and Statement II) is the correct explanation of Statement I)

Plastic deformation results in work hardening or strain hardening of metals, which increases strength of metals. Due to plastic deformation, the grain size changes and the mechanical properties depend on grain size. The fine grain materials tend to be stronger than coarse grained material. Material with finer grain tend to be stronger than material with coarse grains because they offer greater hindrance to dislocation motion. The grain size can be controlled either by the rate of solidification or by plastic deformation. Hence, cold working results in the improved mechanical properties.

Statement II) thus gives the explanation for statement I).

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Feb 20, 2025

Statement (I): Pursuant to plastic deformation of metals, the mechanical properties of the metals get changed. Statement (II): Mechanical properties of metals depend on grain size also which gets changed by plastic deformation.

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