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MATERIALS SCIENCE
ArticleName Effect of Ca and Zn alloying on the structure and properties of Al – 2.5%Mg alloy
DOI 10.17580/nfm.2019.01.04
ArticleAuthor Naumova E. A., Petrzhik M. I., Shurkin P. K., Sokorev A. A.
ArticleAuthorData

1National University of Science and Technology “MISiS”, Moscow, Russia ; 2Moscow State Technological University “STANKIN”, Moscow, Russia:

E. A. Naumova, Associate Professor1, 2, Metal Forming Department, e-mail: jan73@mail.ru

 

National University of Science and Technology “MISiS”, Moscow, Russia:
M. I. Petrzhik, Professor, Powder Metallurgy and Functional Coatings Department
P. K. Shurkin, Post-Graduate Student, Metal Forming Department
A. A. Sokorev, Senior Lecturer, Department of Foundry and Artistic Processing of Materials

Abstract

In an effort to optimize the composition of high-strength Ca-containing aluminum alloys, the dependences of the hardness of Al – 2.5Mg – (0...10)Ca – (0...14)Zn (wt.%) compositions upon the aging temperature have been studied. The structure of alloys and the composition of individual microstructure constituents have been investigated by means of light and scanning electron microscopy as well as the energy dispersive X-ray microanalysis (EDXMA) method. Determined are the concentrations of Zn in primary crystals and in a eutectic for all experimental alloys. It was fixed that the composition of primary crystals in Al – 2.5Mg – 4Ca – 12Zn, Al – 2.5Mg – 6Ca – 12Zn and Al – 2.5Mg – 10Ca – 14Zn alloys accords with the Al3ZnCa phase. The hardness and elastic modulus of (Al,Zn)4Ca primary crystals and [(Al) + (Al, Zn)4Ca] eutectic in Al – 2.5Mg – 10Ca – (1…14)Zn alloys have been determined by the instrumented nanoindentation method. It was found that these mechanical properties are rising as the concentration of Zn in primary crystals increases. According to the study fulfilled, the best combination of mechanical and technological properties has been achieved in Al – 2.5%Mg alloys with the content of Ca varied from 3 to 4% and Zn from 8 to 10%.

This work was supported by Task No. 11.2072.2017/4.6 for the implementation of the project on the theme of “Development of technology for obtaining deformed semi-finished products from alumomatrix eutectic composites reinforced with L12 nanoparticles without hardening”.

keywords Aluminum alloys, eutectic, primary crystals, quenching, ageing, hardening, dispersoids, nanoindentation, hardness, elastic modulus
References

1. Aluminum: properties and physical metallurgy. Hatch J. E. (Ed.). Ohio: ASM, 1984.105 p.
2. Altenpohl D. G. Aluminum: technology, applications, and environment. Washington The Aluminum Association, Inc. and TMS, Inc., 1998. 488 p.
3. Epstein S. G. Aluminum and its alloys. Washington : The Aluminum Association, Inc., 1994. 26 p.
4. King F. Aluminum and its alloys. Chichester : Ellis Horwood Ltd., 1987. 313 p.
5. Marlaud T., Deschamps A., Bley F., Lefebvre W., Baroux B. An Influence of alloy composition and heat treatment on precipitate composition in Al – Zn – Mg – Cu alloys. Acta Materialia. 2010. Vol. 58. pp. 248–260.
6. Du Z. W., Sun Z. M., Shao B. L., Zhou T. T., Chen C. Q. Quantitative evaluation of precipitates in an Al – Zn – Mg – Cu alloy after isothermal aging. Materials Characterization. 2006. Vol. 56. pp. 121–128.
7. Junzhou Chen, Liang Zhen, Shoujie Yang, Wenzhu Shao Dai. Investigation of precipitation behavior and related hardening in AA 7055 aluminum alloy. Materials Science and Engineering: A. 2009. Vol. 500. pp. 34–42.
8. Starink M. J., Wang S. C. A model for the yield strength of overaged Al – Zn – Mg – Cu alloys. Acta Materialia. 2003. Vol. 51. pp. 5131–5150.
9. Marlaud T., Deschamp A., Bley F., Lefebvre W., Baroux B. Influence of alloy composition and heat treatment on precipitate composition in Al – Zn – Mg – Cu alloys. Acta Materialia. 2010. Vol. 58. pp. 248–260.
10. Senkov O. N., Shagiev M. R., Senkova S. V., Miracle D. B. Precipitation of Al3(Sc,Zr) particles in an Al – Zn – Mg – Cu – Sc – Zr alloy during conventional solution heat treatment and its effect on tensile properties. Acta Materialia. 2008. Vol. 56. pp. 3723–3738.
11. Naumova E. A., Belov N. A., Bazlova T. A. Effect of heat treatment on structure and strengthening of cast eutectic aluminum alloy Al9Zn4Ca3Mg. Metal Science and Heat Treatment. 2015. Vol. 57. pp. 1–7.
12. Belov N. A., Naumova E. A., Akopyan T. K. Effect of calcium on structure, phase composition and hardening of Al – Zn – Mg alloys containing up to 12 wt.% Zn. Materials Research: Ibero-American Journal of Materials. 2015. Vol. 18, Iss. 6. pp. 1384–1391.
13. Piatti G., Pellegrini G., Trippodo D. The tensile properties of a new superplastic aluminum alloy: Al – Al4Ca eutectic. Journal of Materials Science. 1976. No. I. pp. 168–190.
14. Moore D. M., Morris L. R. Superplastic aluminum alloy products and method of preparation. Patent UK, No. 1580281. Applied: 29.03.1978. Published: 03.12.1980.
15. Moore D. M., Morris L. R. A new superplastic aluminum sheet alloy. Materials Science and Engineering. 1980. No. 43(1). pp. 85–92.
16. Ilenko V. M. Superplasticity of eutectic alloys based on the aluminum-calcium system and development of materials for superplastic forming. Dissertation … of Candidate of Engineering Sciences. Moscow : MISiS, 1985. 264 p.
17. Swaminathan K., Padmanabhan K. A. Tensile flow and fracture behavior of a superplastic Al – Ca– Zn alloy. Journal of Materials Science. 1990. No. 25(11). pp. 4579–4586.
18. Perez-Prado M. T., Cristina M.C., Ruano O. A., Gonza G. Microstructural evolution of annealed Al – 5%Ca – 5% Zn sheet alloy. Journal of Materials Science. 1997. No. 32. pp. 1313–1318.
19. Kono N., Tsuchida Y., Muromachi S., Watanabe H. Study of the AlCaZn ternary phase diagram. Light Metals. 1985. No. 35. pp. 574–580.
20. Kevorkov D., Schmid-Fetzer R. The Al – Ca system, part 1: experimental investigation of phase equilibria and crystal structures. Zeitschrift für Metallkunde. 2001. No. 92(8). pp. 946–952.
21. Kevorkov D., Schmid-Fetzer R., Pisch A., Hodaj F., Colinet C. The Al-Ca system, part 2: calorimetric measurements and thermodynamic assessment. Zeitschrift für Metallkunde. 2001. No. 92(8). pp. 953–958.
22. Belov N. A., Naumova E. A., Doroshenko V. V., Avxentieva N. N. Combined effect of calcium and silicon on the phase composition and structure of Al – 10%Mg alloy. Russian Journal of Non-Ferrous Metals. 2018. Vol. 59, No. 1. pp. 67–75.
23. Belov N. A., Naumova E. A., Akopyan T. K. Eutectic alloys based on aluminum: new alloying systems, Mosсow : “Ore and Metals” Publishing house, 2016. 256 p.
24. Belov N. A., Naumova E. A., Bazlova T. A., Doroshenko V. V. Phase composition and hardening of castable Al – Ca – Ni – Sc alloys containing 0.3%Sc. Metal Science and Heat Treatment. 2017. No. 59. pp. 76–81.
25. Belov N. A., Naumova E. A., Akopyan T. K. Effect of 0.3%Sc on microstructure, phase composition and hardening of Al – Ca – Si eutectic alloys. Transactions of Nonferrous Metals Society of China. 2017. No. 27. pp. 741–746
26. Zolotorevskij. V. S., Belov N. A. Physical metallurgy of casting aluminium alloys. Moscow : MISiS, 2005. 376 p.
27. Belov N. A., Zolotorevskij. V. S. The effect of nickel on the structure, mechanical and casting properties of aluminium alloy of 7075 type. Materials Science Forum. 2002. Vol. 396–402. pp. 935–940.
28. Mansurov Yu. N., Belov N. A., Sannikov A. V., Buravlev I. Yu. Optimization of composition and properties of heatresistant complex-alloyed aluminum alloy castings. Non-ferrous Metals. 2015. No. 2. pp. 48–55.
29. Loginov P., Mishnaevsky L. Jr., Levashov E., Petrzhik M. Diamond and CBN hybrid and nanomodified cutting tools with enhanced performances: Development, testing and modeling. Materials and Design. 2015. Vol. 88. pp. 310–319.
30. Petrzhik M. I., Levashov E. A. Modern methods for investigating functional surfaces of advanced materials by mechanical contact testing. Crystallography Reports. 2007. Vol. 52, No. 6. pp. 966–974.
31. Mondolfo L. F. Aluminum alloys: structure and properties. London : Butterworths, 1976. 971 p.
32. Drits M. E., Zusman L. L. Alloys of alkali and alkaliearth metals: Reference book. Moscow : Metallurgiya, 1986. 249 p.

Full content Effect of Ca and Zn alloying on the structure and properties of Al – 2.5%Mg alloy
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