Chapter 7.2

Chapter 7.2 - Interactions between dislocations The strain...

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6 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening Interactions between dislocations The strain fields around dislocations cause them to interact (exert force on each other). When they are in the same plane, they repel if they have the same sign (direction of the Burgers vector) and attract/annihilate if they have opposite signs.
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7 MSE 2090: Introduction to Materials Science Chapter 7, Strengthening The number of dislocations in a material is expressed as the dislocation density - the total dislocation length per unit volume or the number of dislocations intersecting a unit area. Dislocation densities can vary from 10 5 cm -2 in carefully grown metal crystals to 10 12 cm -2 in heavily deformed metals. Where do dislocations come from ? Most crystalline materials, especially metals, have dislocations in their as-formed state, mainly as a result of stresses (mechanical, thermal. ..) associated with the forming process.
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Chapter 7.2 - Interactions between dislocations The strain...

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