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22.4: Dislocation Glide

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    32682
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    Dislocation motion along a crystallographic direction is called glide or slip. In the bubble raft experiment, dislocations glide when the raft is deformed. There must be a local shear stress in an appropriate direction on the dislocation for glide to occur. Dislocation glide allows plastic deformation to occur at a much lower stress than would be required to move a whole plane of atoms past another. These animations compare how plastic shear deformation occurs in a 2D primitive square lattice with and without dislocation glide.

    https://www.doitpoms.ac.uk/tlplib/di...true-glide.mp4

    Animation of slip by dislocation glide

    https://www.doitpoms.ac.uk/tlplib/di...alse-glide.mp4

    Animation of slip by movement of whole lattice planes

    The stress required to cause slip by moving entire planes past one another, and the stress required to cause slip by dislocation motion can be estimated. The calculation shows that the stress required for slip is much lower when the mechanism of slip is dislocation motion, and from this we can conclude that slip does occur by dislocation motion.


    This page titled 22.4: Dislocation Glide is shared under a CC BY-NC-SA 2.0 license and was authored, remixed, and/or curated by Dissemination of IT for the Promotion of Materials Science (DoITPoMS) via source content that was edited to the style and standards of the LibreTexts platform.

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