Журналы →  Tsvetnye Metally →  2023 →  №11 →  Назад

MATERIALS SCIENCE
Название (AlSi)3ScZr nanoparticles formed during cooling down of Al – Mg – Si alloy ingots and their effect on mechanical properties
DOI 10.17580/tsm.2023.11.09
Автор Konovalov S. V., Aryshenskiy E. V., Lapshov M. A., Drits A. M.
Информация об авторе

Siberian State Industrial University, Novokuznetsk, Russia

S. V. Konovalov, Vice Rector for Research and Innovation, Chief Researcher at the Industry-Specific Research Laboratory No. 42, Doctor of Technical Sciences, Professor, e-mail: konovalov@sibsiu.ru

 

Siberian State Industrial University, Novokuznetsk, Russia1Samara National Research University, Samara, Russia2
E. V. Aryshenskii, Senior Researcher at the Research Laboratory of Electron Microscopy and Image Processing1, Leading Researcher at the Industry-Specific Research Laboratory No. 42, Doctor of Technical Sciences, Associate
Professor, e-mail: ar-evgenii@yandex.ru


SMP JSC, Samara, Russia

M. A. Lapshov, Lead Design Engineer, e-mail: Maksim.Lapshov@samara-metallurrg.ru

 

Samara National Research University, Samara, Russia
A. M. Drits, Lead Researcher at the Industry-Specific Research Laboratory No. 4, Candidate of Technical Sciences, e-mail: dritsam@gmail.com

Реферат

This paper looked at the (AlSi)3ScZr particles that precipitate in Al – Mg – Si alloys with excessive silicon when they are cooling down after casting. The effect of nanoparticles on strength is demonstrated in as-cast state. The effect of artificial ageing on the mechanical properties of studied alloys is also demonstrated. The paper examines six Al – Mg – Si alloys with different Mg/Si ratios and with scandium and zirconium additives or without them. Microhardness and mechanical properties were determined for all alloys in as-cast state. To look at the decomposition of supersaturated solid solution, specimens of alloys containing scandium and zirconium were annealed in the temperature range of 360 to 550 oC, with the soaking time varying between 10 and 50 hours. Using optical microscopy, the grain structure was studied for alloys with Mg/Si = 0.6. Besides, a scanning microscopy study of nanoparticles was conducted for 0.6MgSi0.3Sc0.15Zr alloy. For 0.3MgSi0.3Sc0.15Zr and 0.5MgSi0.3Sc0.15Zr alloys, the data about the grain structure and nanoparticles were taken from previous research studies. The results show that the solid solution supersaturated with scandium, zirconium, silicon and magnesium in the studied alloys has an extremely short decomposition time. It happens because of the combined effect of scandium and silicon. Because of the fast decomposition of the supersaturated solid solution, a great number of (AlSi)3ZrSc particles is formed when it is cooling down after casting. The main mechanism behind it is an intermittent decomposition of the supersaturated solid solution suggested by the presence of fan-shaped particles. Particles detected in the 0.6MgSi0.3Sc0.15Zr alloy retain the L12 structure, are partially coherent with aluminium matrix and contain silicon and scandium. Considering their morphology, sizes and chemical composition, they cannot belong to Sc2Si2Al phase. At the same time, they do impact the mechanical properties. Thus, in the 0.6MgSi0.3Sc0.15Zr alloy the yield strength rises by 43 MPa and the ultimate strength – by 61 MPa. The 0.3MgSi0.3Sc0.15Zr and 0.5MgSi0.3Sc0.15Zr alloys also gain higher strength, which is due to the fan-shaped semi-coherent and round fully coherent (AlSi)3ScZr particles detected in previous research studies in as-cast state. It was found that in the 0.3MgSi0.3Sc0.15Zr and 0.5MgSi0.3Sc0.15Zr alloys the yield strength rises by 32 and 67 MPa and the ultimate strength – by 67 and 78 MPa, respectively. During artificial ageing, microhardness can either rise or drop. The grain structure size produces the strongest effect on microhardness during artificial ageing: the larger the grain size is, the higher the microhardness is after artificial ageing of as-cast material.

Support for this research was provided under Grant No. 21-19-00548 https://rscf.ru/project/21-19-00548/ by the Russian Science Foundation.

Ключевые слова Microstructure, aluminium alloys, strengthening nanoparticles, mechanical properties, casting
Библиографический список

1. Savchenkov S., Kosov Y., Bazhin V., Krylov K. et al. Microstructural master alloys features of aluminum–erbium system. Crystals. 2021. Vol. 11, Iss. 11. 1353.
2. Alattar A. L., Bazhin V. Y. Development properties of aluminum matrix composites reinforced by particles of boron carbide. Journal of Physics: Conference Series. IOP Publishing, 2021. Vol. 1990, Iss. 1. 012018.
3. Bazhin V. Y., Gutema E. M., Savchenkov S. A. Production technology features for aluminum matrix alloys with a silicon carbide framework. Metallurgist. 2017. Vol. 60, Iss. 11. pp. 1267–1272.
4. Akopyan T. K., Belov N. A., Letyagin N. V., Milovich F. O. et al. Influence of indium trace addition on the microstructure and precipitation hardening response in Al – Si – Cu casting aluminum alloy. Materials Science and Engineering: A. 2022. Vol. 831. 142329.
5. Hirsch J. Aluminium in innovative light-weight car design. Materials Transactions. 2011. Vol. 52, No. 5. pp. 818–824.
6. Deev V. B., Ri E. K., Prusov E. S., Ermakov M. A. et al. Influence of parameters of melt processing by nanosecond electromagnetic pulses on the structure formation of cast aluminum matrix composites. Russian Journal of Non-Ferrous Metals. 2022. Vol. 63, Iss. 4. pp. 392–399.
7. Deev V. B., Ri E. H., Prusov E. S., Ermakov M. A. et al. Grain refinement of casting aluminum alloys of the Al – Mg – Si system by processing the liquid phase using nanosecond electromagnetic pulses. Russian Journal of Non-Ferrous Metals. 2021. Vol. 62, Iss. 5. pp. 522–530.
8. Niranjani V. L., Kumar K. C. H., Sarma V. S. Development of high strength Al – Mg – Si AA6061 alloy through cold rolling and ageing. Materials Science and Engineering: A. 2009. Vol. 515, Iss. 1-2. pp. 169–174.
9. Polmear I. Light alloys: from traditional alloys to nanocrystals. Elsevier, 2005. 416 p.
10. Edwards G. A., Stiller K., Dunlop G. L., Couper M. J. The precipitation sequence in Al – Mg – Si alloys. Acta Materialia. 1998. Vol. 46, Iss. 11. pp. 3893–3904.
11. Matsuda K., Ikeno S., Terayama K., Matsui H. et al. Comparison of precipitates between excess Si-type and balanced-type Al – Mg – Si alloys during continuous heating. Metallurgical and Materials Transactions A. 2005. Vol. 36, Iss. 8. pp. 2007–2012.
12. Kolachev B. A., Elagin V. I., Livanov V. A. Metal science and heat treatment of non-ferrous metals and alloys. Moscow : MISIS, 2005. 432 p.
13. Meyruey G. et al. Over-ageing of an Al – Mg – Si alloy with silicon excess. Materials Science and Engineering: A. 2018. Vol. 730. pp. 92–105.
14. Dorin T., Ramajayam M., Vahid A., Langan T. Aluminium scandium alloys. Fundamentals of Aluminium Metallurgy. 2018. pp. 439–494.
15. Röyset J., Ryum N. Scandium in aluminium alloys. International Materials Reviews. 2005. Vol. 50, Iss. 1. pp. 19–44.
16. Rokhlin L. L., Bochvar N. R., Dobatkina T. V. Combined effect of some transition metals on the change in the phase composition and recrystallization of aluminum. Tekhnologiya legkikh splavov. 2009. Vol. 2. pp. 20–27.
17. Babaniaris S., Ramajayam M., Jiang L., Langan T. et al. Developing an optimized homogenization process for Sc and Zr containing Al – Mg – Si alloys. Light Metals 2019. Springer, Cham, 2019. pp. 1445–1453.
18. Dorin T., Ramajayam M., Babaniaris S., Jiang, L. et al. Precipitation sequence in Al – Mg – Si – Sc – Zr alloys during isochronal aging. Materialia. 2019. Vol. 8. 100437.
19. Rokhlin L. L., Bochvar N. R., Tabachkova N. Yu., Sukhanov A. V. Effect of scandium on the kinetics and age hardening of AL-MG 2SI alloys. Tekhnologiya legkikh splavov. 2015. No. 2. pp. 53–62.
20. Babaniaris S., Ramajayam M., Jiang L., Langan T. et al. Tailored precipitation route for the effective utilisation of Sc and Zr in an Al – Mg – Si alloy. Materialia. 2020. Vol. 10. 100656.
21. Dorin T., Ramajayam M., Babaniaris S., Jiang, L. et al. Precipitation sequence in Al – Mg – Si – Sc – Zr alloys during isochronal aging. Materialia. 2019. Vol. 8. 100437.
22. Aryshenskii E., Lapshov M., Hirsch J., Konovalov S. et al. Influence of the small SC and ZR additions on the as-cast microstructure of Al – Mg – Si alloys with excess silicon. Metals. 2021. Vol. 11, Iss. 11. 1797.
23. Aryshenskii E., Lapshov M., Konovalov S., Hirsch J. et al. The casting rate impact on the microstructure in Al – Mg – Si alloy with silicon excess and small Zr, Sc additives. Metals. 2021. Vol. 11, Iss. 12. 2056.
24. Blake N., Hopkins M. A. Constitution and age hardening of Al – Sc alloys. Journal of Materials Science. 1985. Vol. 20, Iss. 8. pp. 2861–2867.
25. Norman A. F., Prangnell P. B., McEwen R. S. The solidification behaviour of dilute aluminium–scandium alloys. Acta Materialia. 1998. Vol. 46, Iss. 16. pp. 5715–5732.
26. GOST 27333–87. Nondestructive testing. Measurement of electrical conductivity of non-ferrous metals by eddy current method. Introduced: 01.07.1988.
27. GOST 10006–80 (ISO 6892-84). Metal tubes. Tensile test method. Introduced: 01.07.1980.
28. GOST 1497–84. Metals. Methods of tension test. Introduced: 01.01.1986.
29. GOST 11150–84. Metals. Methods of tension tests at Iow temperatures. Introduced: 01.01.1986.
30. Yong D., Shuhong L., Baiyun H., Chang Y. A. et al. Thermodynamic description of the Al – Fe – Mg – Mn – Si system and investigation of microstructure and microsegregation during directional solidification of an Al – Fe – Mg – Mn – Si alloy. Zeitschrift für Metallkunde. 2005. Vol. 96. pp. 1351–1362.
31. Zakharov V. V. Stability of scandium solid solution in aluminum. Metal Science and Heat Treatment of Metals. 1997. Vol. 2. 15.

Language of full-text русский
Полный текст статьи Получить
Назад