Chapter 7.4

Chapter 7.4 - Strengthening The ability of a metal to...

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16 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Strengthening The ability of a metal to deform depends on the ability of dislocations to move Restricting dislocation motion makes the material stronger Mechanisms of strengthening in single-phase metals: ¾ grain-size reduction ¾ solid-solution alloying ¾ strain hardening Ordinarily, strengthening reduces ductility
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17 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Strengthening by grain-size reduction (I) Small angle grain boundaries are not very effective in blocking dislocations. High-angle grain boundaries block slip and increase strength of the material. A stress concentration at end of a slip plane may trigger new dislocations in an adjacent grain. Grain boundary barrier to dislocation motion: slip plane discontinues or change orientation.
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18 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Strengthening by grain-size reduction (II) The finer the grains, the larger the area of grain boundaries
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Chapter 7.4 - Strengthening The ability of a metal to...

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