Issues »  Volume 14, Issue 2

Locking of Dislocations without the Application of an External Stress: Experiment and Theory

B. A. Greenberg$^{1}$, M. O. Ivanov$^{2}$, O. V. Antonova$^{1}$, A. M. Patselov$^{1}$, A. V. Plotnikov$^{1}$, A. M. Vlasova$^{1}$

$^1$Institute of Metal Physics of UB RAS, 18 S. Kovalevskoy, 620990 Yekaterinburg, Russia
$^2$G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine

Received: 14.02.2013. Download: PDF

Results of investigation of self-locking effect representing transformation of glide dislocations into the locked ones in the absence of external stress are presented. The effect was predicted theoretically on basis of a simple model considering superdislocation as a pileup, where one of the dislocations contributes to the locking of the other one, and, as a result, both are locked. The proof of the effect occurrence, namely, observation that dislocations elongate along prevailing direction, was experimentally revealed, including a plastic deformation and a subsequent heating without a load. To explain the set of experimental results, a new conception is developed: an effective force, being proportional to the difference of the depths of the valleys, appears, if dislocation has a two-valley potential relief. This force causes transformation of dislocations into an indestructible barrier. Consequently, two effects (the temperature anomaly of the yield stress and the self-locking of dislocations) are of the same common nature. Both effects were observed in the intermetallic compounds such as Ni$_{3}$Al and TiAl as well as in the pure metals such as Mg.

Keywords: automatic block of dislocations, superdislocations, sliding, yield point, thermomechanical treatment.

PACS: 61.72.Bb, 61.72.Ff, 61.72.Hh, 61.72.Lk, 62.20.fg, 62.40.+i, 81.40.Lm

DOI: https://doi.org/10.15407/ufm.14.02.107

Citation: B. A. Greenberg, M. O. Ivanov, O. V. Antonova, A. M. Patselov, A. V. Plotnikov, and A. M. Vlasova, Locking of Dislocations without the Application of an External Stress: Experiment and Theory, Usp. Fiz. Met., 14, No. 2: 107—227 (2013) (in Russian), doi: 10.15407/ufm.14.02.107

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Cited By (1)
  1. A. V. Plotnikov, B. A. Greenberg, M. A. Ivanov, V. P. Pilyugin et al., Phys. Metals Metallogr. 118, 802 (2017).

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