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Why is edge dislocation faster than screw dislocation?

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Mechanical Engineering

Whyis edge dislocation faster than screw dislocation?


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Edge dislocation is faster than Screw dislocation due to associated shear stress (distortion) in case of Screw dislocation.

Berger vector indicates the direction of dislocation w.r.to slip plane. it is perpendicular to dislocation line in case of edge dislocation and parallel to dislocation line in Screw dislocation.

Helix or Spiral structure is formed in case of screw dislocation and shear stress is associated with atoms adjacent to dislocation region. This consumes more energy in compare to edge dislocation. it means less energy is required in edge dislocation than screw dislocation. Hence, edge dislocation is faster than screw disloaction.
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