Chapter 4.6

Chapter 4.6 - Interaction between dislocations and grain...

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26 MSE 2090: Introduction to Materials Science Chapter 4, Defects in crystals Motion of dislocations can be impeded by grain boundaries – increase of the force needed to move then ( strengthening the material ). 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 present a barrier to dislocation motion: slip plane discontinues or change orientation. Interaction between dislocations and grain boundaries
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27 MSE 2090: Introduction to Materials Science Chapter 4, Defects in crystals Tilt and twist grain boundaries If the rotation axis that corresponds to the angle of misorientation between the adjacent grains is parallel to the boundary plane, the grain boundary is called tilt boundary (consider joint of two wedges).
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Chapter 4.6 - Interaction between dislocations and grain...

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