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Russian Physics Journal

, Volume 54, Issue 8, pp 906–913 | Cite as

Detection of (C + A)-type dislocation self-blocking in magnesium

  • B. A. Grinberg
  • M. A. Ivanov
  • O. V. Antonova
  • A. M. Vlasova
  • N. A. Kruglikov
  • A. V. Plotnikov
Article

The self-blocking effect predicted theoretically and then observed in intermetallides is established for a pure metal, namely, for magnesium. This effect can be observed only for magnesium single crystals whose axis is parallel to the c axis and whose yield stress behavior σ y (T) has a temperature anomaly. For such single crystals, the self-blocking of the (c + a)-type edge dislocations is established during pyramidal slip of type II. The self-blocking is proved by dislocation extension along the preferred direction without external stress. In this case, the \( \left\langle {1\bar{1}00} \right\rangle \) directions appear preferred. TEM images of (c + a) dislocations extended along the preferred directions are presented. It is demonstrated that two effects – temperature anomaly of σ y (T) and dislocation self-blocking – have the common nature: a two-valley potential relief of the dislocation. A model of two-valley relief of the (c + a) dislocations in Mg is proposed.

Keywords

magnesium dislocation blocking 

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Copyright information

© Springer Science+Business Media, Inc. 2011

Authors and Affiliations

  • B. A. Grinberg
    • 1
  • M. A. Ivanov
    • 2
  • O. V. Antonova
    • 1
  • A. M. Vlasova
    • 1
  • N. A. Kruglikov
    • 1
  • A. V. Plotnikov
    • 1
  1. 1.Institute of Metal Physics of the Ural Branch of the Russian Academy of SciencesEkaterinburgRussia
  2. 2.G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of UkraineKievUkraine

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