Chapter 7.5

Chapter 7.5 - 100 A A A CW % d = where A 0 is the original...

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21 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Solid-Solution Strengthening (III)
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22 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Strengthening by increase of dislocation density (Strain Hardening = Work Hardening = Cold Working) Ductile metals become stronger when they are deformed plastically at temperatures well below the melting point. The reason for strain hardening is the increase of dislocation density with plastic deformation . The average distance between dislocations decreases and dislocations start blocking the motion of each other. The percent cold work (%CW) is often used to express the degree of plastic deformation: %CW is just another measure of the degree of plastic deformation, in addition to strain.
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Unformatted text preview: 100 A A A CW % d = where A 0 is the original cross-section area, A d is the area after deformation. 23 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Strain hardening (II) New yield strength is higher than the initial yield strength, . The reason for this effect - strain hardening. y i y 24 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Strain hardening (III) Yield strength and hardness are increasing as a result of strain hardening but ductility is decreasing (material becomes more brittle). 25 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Strain hardening (IV)...
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Chapter 7.5 - 100 A A A CW % d = where A 0 is the original...

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