Effect of melt cooling rate on the microstructure and thermal properties of Al – Ge alloy

  • Olga V. Gusakova International Sakharov Environmental Institute, Belarusian State University, 23/1 Dauhabrockaja Street, Minsk 220070, Belarus https://orcid.org/0000-0002-9796-4476
  • Yuliya M. Shulya International Sakharov Environmental Institute, Belarusian State University, 23/1 Dauhabrockaja Street, Minsk 220070, Belarus
  • Hanna M. Skibinskaya International Sakharov Environmental Institute, Belarusian State University, 23/1 Dauhabrockaja Street, Minsk 220070, Belarus
  • Vladimir E. Ankudinov Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, 14 Kaluzhskoe highway, Moscow (Troitsk) 142190, Russia
DOI: https://doi.org/10.33581/2520-2243-2020-2-70-77

Abstract

The paper presents the results of comparing the microstructure of alloys of the Al – Ge system of eutectic and near- eutectic compositions synthesized at melt cooling rates of 102 and 105 K/s. It was shown by scanning electron microscopy that at a cooling rate of 102 K/s, crystallization starts with grain growth of the excess component and ends with a eutectic reaction. The microstructure of bulk samples is characterized by large inclusions of aluminum and germanium and heterogeneity of composition at sample cross section. The size reduction of phase particles of alloys of the Al – Ge system of eutectic and near-eutectic compositions is achieved using high-speed solidification. It is shown that the cooling rate of the melt increase causes size reduction of phase particles by 2–3 orders. The layering of the microstructure of the cross section of rapidly solidified foils was also revealed, and a mechanism for its formation was proposed taking into account changes in the solidification conditions over the thickness of the foil. Using differential scanning calorimetry, it was shown that an increase in the cooling rate provides a narrowing of the melting temperature range and an increase in the melting rate.

Author Biographies

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

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

Yuliya M. Shulya, International Sakharov Environmental Institute, Belarusian State University, 23/1 Dauhabrockaja Street, Minsk 220070, Belarus

senior lecturer at the department of energy efficient technologies, faculty of environmental monitoring

Hanna M. Skibinskaya, International Sakharov Environmental Institute, Belarusian State University, 23/1 Dauhabrockaja Street, Minsk 220070, Belarus

senior lecturer at the department of nuclear and radiation safety, faculty of environmental monitoring

Vladimir E. Ankudinov, Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, 14 Kaluzhskoe highway, Moscow (Troitsk) 142190, Russia

PhD (physics and mathematics); researcher at the theoretical department

References

  1. Gurin VN, Nikanorov SP, Volkov MP, Derkachenko LI, Popova TB, Korkin IV, et al. [Crystallization in the Al – Si, Al – Ge, and Al – Si – Ge systems at centrifugation]. Zhurnal tekhnicheskoi fiziki. 2005;75(3):56–62. Russian.
  2. Derkachenko LI, Korchunov BN, Nikanorov SP, Osipov VN, Shpeizman VV. [Structure, microhardness, and strength of a directionally crystallized Al – Ge]. Fizika tverdogo tela. 2014;56(3):512–515. Russian.
  3. Volkov MP, Gurin VN, Nikanorov SP, Burenkov YuA, Derkachenko LI, Kardashev BK, et al. [Structure and mechanical properties of Al – Si (Ge) alloys upon melt centrifugation and quenching]. Fizika tverdogo tela. 2005;47(5):886–892. Russian.
  4. Egorova LM, Korchunov BN, Osipov VN, Bershtein VA, Nikanorov SP. [Kinetics of the precipitation of germanium in binary aluminum-germanium alloys produced by directed crystallization]. Fizika tverdogo tela. 2015;57(2):219–223. Russian.
  5. Yan N, Geng DL, Hong ZY, Wei B. Ultrasonic levitation processing and rapid eutectic solidification of liquid Al – Ge alloys. Journal of Alloys and Compounds. 2014;607:258–263. DOI: 10.1016/j.jallcom.2014.04.006.
  6. Tashlykova-Bushkevich II, Shepelevich VG, Gutko ES. [Metastable phases in rapidly solidified lightly alloyed system alloys Al – Ge]. Fizika i khimiya obrabotki materialov. 2002;3:79–85. Russian.
  7. Goldstein J, Jakovitsa H, editors. Practical scanning electron microscopy. Boston: Springer; 1975. 572 p. DOI: 10.1007/9781-4613-4422-3. Russian edition: Goldstein J, Jakovitsa H, editors. Prakticheskaya rastrovaya elektronnaya mikroskopiya. Moscow: Mir; 1978. 656 p.
  8. Shepelevich VG, Gusakova OV, Alexandrov DV, Starodumov IO. Phase composition of hypereutectic silumin at rapid solidification. Journal of the Belarusian State University. Physics. 2019;2:96–104. Russian. DOI: 10.33581/2520-2243-2019-2-96-104.
  9. Gusakova ОV, Shepelevich VG. [Structure and properties of rapidly solidified films of Sn – Zn – Bi system]. Perspektivnye materialy. 2010;2:74–80. Russian.
  10. Gusakova O, Shepelevich V, Scherbachenkо L. Effect of melt cooling rate on microstructure of Sn – Bi and Sn – Pb eutectic alloys. Advanced Materials Research. 2014;856:236–240. DOI: 10.4028/www.scientific.net/AMR.856.236.
  11. Herlach D, Galenko P, Holland-Moritz D. Metastable solids from undercooled melts. Amsterdam: Elsevier; 2007. DOI: 10.4028/ www.scientific.net/MSF.539-543.1977.
Published
2020-06-07
Keywords: aluminum, germanium, rapid solidification, microstructure
Supporting Agencies This work was carried out as part of project No. F18R-105 of the Belarusian Republican Foundation for Fundamental Research.
How to Cite
Gusakova, O. V., Shulya, Y. M., Skibinskaya, H. M., & Ankudinov, V. E. (2020). Effect of melt cooling rate on the microstructure and thermal properties of Al – Ge alloy. Journal of the Belarusian State University. Physics, 2, 70-77. https://doi.org/10.33581/2520-2243-2020-2-70-77
Issue
No 2 (2020): Journal of the Belarusian State University. Physics
Section
Condensed State Physics

Copyright (c) 2020 Journal of the Belarusian State University. Physics

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

The authors who are published in this journal agree to the following:

  1. The authors retain copyright on the work and provide the journal with the right of first publication of the work on condition of license Creative Commons Attribution-NonCommercial. 4.0 International (CC BY-NC 4.0).
  2. The authors retain the right to enter into certain contractual agreements relating to the non-exclusive distribution of the published version of the work (e.g. post it on the institutional repository, publication in the book), with the reference to its original publication in this journal.
  3. The authors have the right to post their work on the Internet (e.g. on the institutional store or personal website) prior to and during the review process, conducted by the journal, as this may lead to a productive discussion and a large number of references to this work. (See The Effect of Open Access.)