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Self-blocking of dislocations in intermetallic compound Ni3Ge: Cubic slip

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Abstract

Self-blocking of dislocations belonging to the cube plane has been detected in the intermetallic compound Ni3Ge. The nature of cubic slip has been clarified. The experiments included deformation at a temperature above T max (the temperature of the yield-stress peak) and subsequent heating without stress. In addition, changes in the dislocation structure upon slow cooling from the temperature of the preliminary deformation have been investigated; in doing so, self-blocking of dislocations has been revealed for the first time. Based on the totality of experimental data, a conclusion has been made on the two-valley potential relief for a dislocation motion in the cube plane. It is the difference in the depths between the Peierls valley (a diffuse core in the cube plane) and the deepest valley (a superpartial dislocation split in the octahedron plane) that provides for the driving force of self-blocking in the absence of an external stress. Different aspects of cubic slip have been considered: the disappearance of cubic slip at T < T max and, correspondingly, the nonobservation of an anomalous behavior of the yield stress, as well as the disappearance of octahedral slip at T > T max.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620990, Russia

    B. A. Greenberg, O. V. Antonova, A. V. Plotnikov, N. A. Kruglikov & A. M. Vlasova

  2. Kurdjumov Institute of Metal Physics, National Academy of Sciences of Ukraine, bul. Vernadskogo 36, Kiev, 03680, Ukraine

    M. A. Ivanov

  3. Tomsk State University of Architecture and Building, pl. Solyanaya 2, Tomsk, 634003, Russia

    Yu. V. Solov’eva

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  1. B. A. Greenberg
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  2. M. A. Ivanov
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  3. O. V. Antonova
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  4. A. V. Plotnikov
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  5. N. A. Kruglikov
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  6. A. M. Vlasova
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  7. Yu. V. Solov’eva
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Original Russian Text © B.A. Greenberg, M.A. Ivanov, O.V. Antonova, A.V. Plotnikov, N.A. Kruglikov, A.M. Vlasova, Yu.V. Solov’eva, 2011, published in Fizika Metallov i Metallovedenie, 2011, Vol. 111, No. 4, pp. 402–412.

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Greenberg, B.A., Ivanov, M.A., Antonova, O.V. et al. Self-blocking of dislocations in intermetallic compound Ni3Ge: Cubic slip. Phys. Metals Metallogr. 111, 385–394 (2011). https://doi.org/10.1134/S0031918X11030057

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  • DOI: https://doi.org/10.1134/S0031918X11030057

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