THE STUDY OF INFLUENCE OF MILLISECOND LASER IRRADIATION ON THE MORPHOLOGY AND CRYSTALLIZATION OF A THERMO-ACTIVATION ZONE FOR Zr-Cu-Ag-Al BULK AMORPHOUS ALLOY


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Abstract

From the moment of their creation, the amorphous metallic alloys draw special attention because of their perfect physicochemical properties such as high strength, low Young’s modulus, and the corrosion resistance. Nowadays, there are several ways for producing bulk metallic glasses but the specimens’ size is limited. Thus, for industrial application as the construction elements, it is necessary to have the technologies of the creation of quality weld joints, using laser beam welding in particular. Moreover, the surface laser treatment is the advanced technology to improve the mechanical properties of amorphous metallic alloys. Herewith, in both cases, the physics of the processes taking place does not vary and their understanding is necessary for the improvement of laser processing, which is a crucial task.

In this paper, the authors studied the influence of laser irradiation on the surface of Zr46(Cu4/5Agy5)46Al8 alloy. The specimen was exposed to the impact of a single laser millisecond impulse (3 ms) with the energy of 3J. The investigation was carried out by the methods of field emission microscopy, X-ray diffraction analysis and the numerical modeling of temperature fields induced by laser irradiation was performed by the COMSOL Multiphysics 5.2 software package.

In the center of a crater, the nanocrystals built into amorphous matrix were detected. By the numerical data, it was established that the cooling rate observed in the experiment should not lead to the crystallization. This may be caused by atomic oxygen founded in the surface layer. The authors detected as well that the oxygen radial distribution is inversely related with the radial interface velocity. The assumption was made that the control over cooling conditions and the atmosphere allows receiving the preliminary determined crystalline structures on the amorphous metallic alloys surface that will improve their (amorphous metallic alloys) mechanical properties.

About the authors

A. A. Shlykova

Tambov State University named after G.R. Derzhavin

Author for correspondence.
Email: alexandra.shlykova@list.ru

graduate student of Chair of Theoretical and Experimental Physics

Russian Federation

V. A. Fedorov

Tambov State University named after G.R. Derzhavin

Email: feodorov@tsu.tmb.ru

Doctor of Sciences (Physics and Mathematics), Professor, professor of Chair of Theoretical and Experimental Physics, Honored master of sciences

Russian Federation

M. F. Gasanov

Tambov State University named after G.R. Derzhavin

Email: gasanovmf@yandex.ru

PhD (Physics and Mathematics), senior lecturer of Chair of Theoretical and Experimental Physics

Russian Federation

A. V. Yakovlev

Tambov State University named after G.R. Derzhavin

Email: DAK-83@mail.ru

PhD (Physics and Mathematics), Associate Professor, assistant professor of Chair of Pedagogy and Educational Technologies

Russian Federation

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