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Cold Working and Hot Working

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Strain Hardening

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The hardening of metal by plastic deformation, which increases its yield strength and hardness but decreases its ductility.

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Hot Working

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Processing or forming metals at temperatures above their recrystallization temperature. It reduces strength, increases ductility, and generally requires less force than cold working.

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Annealing

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Heat treatment process which typically includes heating a material to above its recrystallization temperature, holding it at that temperature, and then cooling it, which relieves internal stresses and improves ductility.

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Recrystallization Temperature

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The minimum temperature at which the strain-induced defects within the metal are repaired during processing, typically half the melting temperature of the material on an absolute temperature scale.

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Yield Strength

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The stress at which a material begins to deform plastically. Prior to the yield point, the material will deform elastically and return to its original shape when the applied stress is removed.

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Dislocation Movement

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A defect within the crystal structure of a material where there exists an irregularity within the otherwise orderly arrangement of atoms, and its movement is a primary mechanism in plastic deformation, particularly in metals.

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Grain Growth

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The increase in the size of grains in a polycrystalline material, usually occurring at high temperatures and often after recrystallization.

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Ductility

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The ability of a material to undergo significant plastic deformation before rupture, which is a measure of a material's capacity to be drawn into a wire.

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Cold Working

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Deforming metals below their recrystallization temperature. It increases strength through strain hardening, reduces ductility, and often enhances surface finish.

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Work Hardening Curve

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A graph that represents the relationship between the stress applied to a material and the amount of plastic deformation it undergoes, generally showing an increase in stress required to continue deforming the material.

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