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Dislocation detachment from weak attachment points

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Abstract

Detachment of dislocations from weak attachment points under the action of a periodic external stress is considered with defect diffusion along dislocations being possible. The expression obtained for the probability of detachment is studied numerically for various amplitudes and durations of the external stress at various concentrations and strengths of the attachment points. Attachment point diffusion increases the probability of detachment, while as the interaction between the dislocation and the point defect increases, the influence of that phenomenon increases as well. Change in the probability of detachment during the excitation process should lead to time dependence of hysteresis-type dislocation internal friction.

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Additional information

Translated from Izvestiya Vysshikh Uchebnykh Zavednii, Fizika, No. 5, pp. 24–28, May, 1989.

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Suprun, I.T. Dislocation detachment from weak attachment points. Soviet Physics Journal 32, 339–343 (1989). https://doi.org/10.1007/BF00895312

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Keywords

  • Time Dependence
  • Point Defect
  • Internal Friction
  • External Stress
  • Attachment Point