This article is cited in 2 papers

Mechanical properties, strength physics and plasticity

Mechanisms of the formation of morphological features of micropipes in bulk crystals of silicon carbide

T. S. Argunova^a, M. Yu. Gutkin^bcd, V. G. Kohn^e, E. N. Mokhov<sup>a

a</sup> Ioffe Institute, St. Petersburg
^b Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, St. Petersburg
^c Peter the Great St. Petersburg Polytechnic University
^d St. Petersburg National Research University of Information Technologies, Mechanics and Optics
^e National Research Centre "Kurchatov Institute", Moscow

Abstract: New morphological features of dislocation micropipes in silicon carbide single crystals have been investigated experimentally and theoretically. It has been shown that the cylindrical shape of micropipes is unstable, and the cross-sectional sizes of the micropipes change along their axes. The experimental results have been obtained by measuring X-ray phase-contrast microscopy images of micropipes in highly coherent synchrotron radiation. The cross-sectional sizes of the micropipes have been determined using computer simulation of their images. A theoretical model of the transformation of dislocations into micropipes due to nonequilibrium processes of pipe diffusion and coagulation of vacancies on dislocations parallel to the crystal growth axis has been proposed.

Received: 16.10.2014

 English version: Physics of the Solid State, , 57:4, 752–759

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