On role of mass-transfer crowdion mechanism in local  relaxation processes

V. G. Kononenko Karazin Kharkov National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
V. V. Bogdanov Karazin Kharkov National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine
М. А. Volosyuk Kharkiv National Automobile and Highway University, 25 Yaroslava Mudrogo Str., 61002 Kharkiv, Ukraine
А. V. Volosyuk Karazin Kharkov National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine

Keywords: dislocations, crowdions, interstitial atoms, diffusion, concentration of stress, relaxation processes

Abstract

Character of relaxation processes has been analyzed in crystalline materials near stress local concentrators of various types (a crack in copper under its healing by uniaxial compression; a rigid (corundum) inclusion in a KCl single crystal; a hole in a KCl single crystal due to pulse optical breakdown of the single crystal by ruby laser radiation). It was shown that in the first two cases (crack and rigid inclusion), the main mechanism resulting in relaxation of about 50% stress was the dislocation-diffusion one. According to this mechanism, excess vacancies and interstitials occur at intersections of screw dislocations; as a result, rapid crowdion (interstitial) mass transfer is switched on completing the relaxation process. In the case of laser breakdown, the crowdion mass transfer mechanism is principal. The diffusion-and-dislocation mechanism steps in at the final stage of the process and provides near 5% of the full necessary mass transfer amount.

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