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Engineering LibreTexts

21: Dislocation Energetics and Mobility

  • Page ID
    31762
  • www.doitpoms.ac.uk/tlplib/me...ng-2/index.php

    Learning Objectives

    On completion of this TLP you should:

    • Understand why a dislocation forms and how the dislocation width can be determined using an atomistic model, by minimisation of misfit energy due to in-plane stress and misalignment.
    • Appreciate how the energy changes as a dislocation moves and how the parameters of atomic spacing, Shear modulus and Poisson ratio affect the total misfit energy.
    • Be familiar with the concepts of Peierls stress and lattice resistance and compare theoretical and experimental values. Also understand the difference between the linear elastic analytic solution used by Peierls and the atomistic model.

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