The microstructure of the rapidly solidified foil of the hypoeutectic alloy Sn – 4.4 wt. % Zn

  • Vasili G. Shepelevich Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
  • Denis A. Zernitsa Mozyr State Pedagogical University named after I. P. Shamyakin, 28 Studenckaja Street, Mazyr 247760, Belarus https://orcid.org/0000-0002-6251-4459
DOI: https://doi.org/10.33581/2520-2243-2021-2-44-52

Abstract

The article presents the results of a study of the microstructure of the rapidly solidified foil of the hypoeutectic alloy Sn – 4.4 wt. % Zn. It was found that the investigated alloy has a two-phase structure, which consists of solid solutions of tin and zinc. Doping of tin with zinc leads to a decrease in the unit cell parameter. The difference between the unit cell parameters of a rapidly solidified alloy in comparison with an alloy of pure tin tends to decrease during holding, which is due to strong supercooling of the melt during its production at ultrahigh speeds, and the formation of a supersaturated solid solution of zinc in tin, which, due to high homological temperatures, as a consequence, active diffusion processes, decomposes at room temperature. It has been established that a microcrystalline structure is formed in the foil of the alloy under study, in the cross section of which there are uniformly distributed equiaxed dispersed dark zinc precipitates against the background of a light tin matrix; the absence of zinc plates in the foil reduces the ability to brittle fracture. The unequal distribution of the average chord of random secants on the grains in the surface layers A is caused by the release of heat, which leads to a decrease in the supercooling of the subsequent layers of the melt, and an increase in the grain size as the crystallisation front moves. It was found that in the (301) plane along the [103] direction, tin twinning is observed, which occurs under the action of quenching stresses at high crystallisation rates. The alloy under study has a (100) tin texture, the formation of which is associated with the fact that the (100) plane is the most densely packed, which promotes the growth of grains with this orientation at the highest rate.

Author Biographies

Vasili G. Shepelevich, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

doctor of science (physics and mathematics), full proffesor; professor at the department of solid state physics, faculty of physics.

Denis A. Zernitsa, Mozyr State Pedagogical University named after I. P. Shamyakin, 28 Studenckaja Street, Mazyr 247760, Belarus

postgraduate student at the department of physics and mathematics, faculty of physics and engineering

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Published
2021-05-21
Keywords: rapidly solidified alloy, lead-free materials, Sn-Zn alloy, hypoeutectics, microstructure, grain, texture
Supporting Agencies The work was supported by the Ministry of Education of the Republic of Belarus under grants (project 1410gr/2021, state registration No. 20211069 dated 06.05.2021).
How to Cite
Shepelevich, V. G., & Zernitsa, D. A. (2021). The microstructure of the rapidly solidified foil of the hypoeutectic alloy Sn – 4.4 wt. % Zn. Journal of the Belarusian State University. Physics, 2, 44-52. https://doi.org/10.33581/2520-2243-2021-2-44-52
Issue
No 2 (2021): Journal of the Belarusian State University. Physics
Section
Condensed State Physics

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