Sn – Zn – Ga alloys for leadfree soldering obtained by rapid quenching

  • Vasiliy G. Shepelevich Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
  • Olga V. Gusakova International Sakharov Environmental Institute, Belarusian State University, 23/1 Daŭhabrodskaja Street, Minsk 220070, Belarus https://orcid.org/0000-0002-9796-4476
DOI: https://doi.org/10.33581/2520-2243-2020-2-50-61

Abstract

The paper presents the results of a study of the structural-phase state of the foil of eutectic near eutectic Sn – Zn alloys doped by Ga obtained by rapid melt quenching at a melt cooling rate of 105 K/s. Using the methods of X-ray diffraction analysis, scanning electron microscopy, and X-ray spectrometry, it was established that the foil solidifies with the formation of tin-based supersaturated solid solution and its microstructure is formed as a result of the decomposition of the solid solution by discontinuous mechanism at room temperature. The homogeneity of the composition and distribution of gallium and zinc inclusions over the volume of the foil was established. Using the electron backscatter diffraction technique, it was shown that the foils have a microcrystalline structure due to the deep supercooling of the melt, which leads to a high crystal nucleation rate. The grain size decreases depending on the distance to the mold. The increase in grain size is associated with a change in the solidification conditions over the thickness of the foil: deterioration of heat removal and a decrease in supercooling. There is no pronounced grain texture in the foils. 

Author Biographies

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

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

Olga V. Gusakova, International Sakharov Environmental Institute, Belarusian State University, 23/1 Daŭhabrodskaja Street, Minsk 220070, Belarus

PhD (physics and mathematics), docent; associate professor at the department of nuclear and radiation safety, faculty of environmental monitoring

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Published
2020-06-04
Keywords: tin, zinc, gallium, rapid solidification, microstructure
How to Cite
Shepelevich, V. G., & Gusakova, O. V. (2020). Sn – Zn – Ga alloys for leadfree soldering obtained by rapid quenching. Journal of the Belarusian State University. Physics, 2, 50-61. https://doi.org/10.33581/2520-2243-2020-2-50-61
Issue
No 2 (2020): Journal of the Belarusian State University. Physics
Section
Condensed State Physics

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