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METAL PROCESSING
ArticleName Stamping with torsion of the Al – Ca alloy workpiece with high concentration of Al4Ca
DOI 10.17580/tsm.2019.01.10
ArticleAuthor Naumova E. A., Petrov М. А., Stepanov B. A., Vasilieva E. S.
ArticleAuthorData

MISiS National University of Science and Technology, Moscow, Russia:

E. A. Naumova, Associate Professor at the Department of Metal Forming, e-mail: jan73@mail.ru

E. S. Vasilieva, Master’s Student at the Department of Metal Forming

 

Moscow Polytechnic University, Moscow, Russia:
М. А. Petrov, Associate Professor at the Department of Metal Forming and Additive Technologies
B. A. Stepanov, Professor at the Department of Metal Forming and Additive Technologies

Abstract

Specimens of the Al — 15% Ca alloy comprising more than 55% of the Al4Ca intermetallic compound were subjected to hot and cold stamping with torsion. Alloys with a high concentration of intermetallic compounds can be used as materials with a low thermal expansion ratio. Stamping with torsion creates severe shear strains. The material structure sees quality changes in the tangential direction, and a fine-grained structure is formed, which enhances the mechanical and physical properties of the material. The equipment used in this research is capable of producing large workpieces with diameters reaching 150 mm. An electric resistance furnace was used to produce the experimental alloy. For better ductility, the cast specimens were annealed at 550 оС in a laboratory furnace. Such annealing procedure results in fragmented eutectic intermetallic compounds which then become of a round shape. For hot stamping with torsion, the stamp was heated to 450 оС, while the temperature of the workpiece was raised to 500 оС; pressure applied – 1 MN; die rotation – 180 degrees. No heat was applied to either the stamp or the workpiece during cold stamping, the same pressure and die rotation were applied as during hot stamping. The microstructure of the primary cast specimens contains aluminium-calcium eutectics, as well as primary crystals of the Al4Ca intermetallic compound of a round or platelet shape. Multiple pores are also present in them. The microstructure of the specimens after hot and cold stamping with torsion is quite non-homogenous. Compared with the peripheral areas, the centre of the specimens has a more consistent structure, finer intermetallic particles, and a higher hardness. The resultant specimens have almost no pores, the primary intermetallic compounds are fragmented and evenly distributed in the specimens, and the hardness rises almost twice compared with the as-cast state.
This research was funded by the grant 14-19-00632P (metallographic study) of the Russian Science Foundation and under the Assignment No. 11.2072.2017/4.6 (experimental stamping with torsion).

keywords Al – Ca alloy, intermetallic compound, stamping with torsion, structure, hardness
References

1. Gopienko V. G., Smagorinsky M. E., Grigoriev A. A., Bellavin A. D. Sintered materials made of aluminium powders. Ed. by M. E. Smagorinsky. Moscow : Metallurgiya, 1993. 320 p.
2. Novikova S. N. Thermal expansion of solids. Moscow : Nauka, 1974. 292 p.
3. Popova M. V., Ushakova V. V., Luzyanina Z. A. et al. Some peculiarities of the linear expansion of alloyed hypereutectic silumins. Izvestiya vuzov. Chernaya metallurgiya. 1996. No. 2. pp. 19–21.
4. Popova M. V., Ovechkina Zh. V. Effect of heat treatment on the linear expansion of the Al – Si – Cu alloys. Metallurgy at the turn of the 21st century: Advancements and Outlook: Proceedings of the national conference. Novokuznetsk, 1999. pp. 164–165.
5. Popova M. V., Frolov V. F., Ruzhilo A. A. et al. Linear expansion of aluminium and its alloys. Part I. Linear expansion of aluminium: Leaner’s guide. Novokuznetsk : SibGIU, 2001. 68 p.
6. Popova M. V., Frolov V. F., Ruzhilo A. A. et al. Linear expansion of aluminium and its alloys. Part II. Linear expansion of aluminium alloys: Leaner’s guide. Novokuznetsk : SibGIU, 2001. 153 p.
7. Swaminathan K., Padmanabhan K. A. Tensile flow and fracture behaviour of a superplastic Al – Ca – Zn alloy. Journal of Materials Science. 1990. Vol. 25, Iss. 11. pp. 4579–4586.
8. 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. Vol. 32. pp. 1313–1318.
9. 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.
10. 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 Bulletin. 2015. Vol. 18, Iss. 6. pp. 1384–1391.
11. Belov N. A., Naumova E. A., Bazlova T. A., Alekseeva E. V. Structure, phase composition, and strengthening of cast Al – Ca – Mg – Sc alloys. The Physics of Metals and Metallography. 2016. Vol. 117, Iss. 2. pp. 188–194.
12. 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, Iss. 1. pp. 67–75.
13. Hansen M., Anderko K. Constitution of binary alloys. In two volumes. Vol. 1. Translated from English. Moscow : Metallurgizdat, 1962. 608 p.
14. Mondolfo L. F. Aluminum alloys: Structure and properties. London, Boston : Butterworths, 1976. 971 p.
15. Petzow G., Effenberg G. Ternary alloys: A comprehensive com pendium of evaluated constitutional data and phase diagrams. Wiley-VCH, 1990. Vol. 3. 647 p.
16. Mantell C. L., Hardy C. Calcium: its metallurgy and technology. Mater. 66-th General Meeting. New York, 1934. P. 63–83.
17. Doronin N. A. Calcium. Moscow : Gosatomizdat, 1962. 191 p.
18. Drits M. E., Zusman L. L. Alloys of alkaline and alkaline earth metals. Reference Book. Moscow : Metallurgiya, 1986. 248 p.
19. Subich V. N., Demin V. A., Shestakov N. A., Vlasov A. V. Stamping with torsion : monograph. Moscow : MGIU, 2008. 389 p.
20. Shneyberg A. M., Malov A. E. Pressing of shavings under combined loading: Shear pressing. Proceedings of the Nizhny Novgorod State Technical University n.a. R. E. Alekseev. 2016. No. 1(112). pp. 189–198.
21. Murashkin M. Yu., Bobruk E. V., Prosvirnin D. V., Ovidko I. A., Terentiev V. F., Dobatkin S. V., Valiev R. Z. Fatigue strength of the 6061 aluminium alloy with ultrafine-grained structure produced by severe torsional deformation. Deformatsiya i razrushenie materialov. 2015. No. 4. pp. 17–24.
22. Murashkin M. Yu., Kilmametov A. R., Valiev R. Z. The structure and mechanical properties of the 1570 aluminium alloy subjected to severe torsional strain. Fizika metallov i metallovedenie. 2008. Vol. 106, No. 1. pp. 93–99.
23. Mazilkin A. A., Kogtenkova O. A., Straumal B. B., Baretzky B., Valiev R. Z. Formation of nanostructure during high-pressure torsion of Al – Zn, Al – Mg and Al – Zn – Mg alloys. Defect Diffusion. Forum. 2005. Vol. 237–240, Iss. 2. pp. 739–744.
24. Edalati K., Horita Z. A review on high-pressure torsion (HPT) from 1935 to 1988. Materials Science & Engineering: A. 2016. Vol. 652. pp. 325–352.
25. Petrov M. A., Subich V. N., Petrov P. A. Numerical study of the innovative process of stamping with torsion. Prom-Inzhiniring: Proceedings of the 3rd International Conference. 2017. pp. 338–342.
26. Stepanov B. A., Petrov M. A. Screw press for stamping with torsion. Izvestiya Tulskogo gosudarstvennogo universiteta. Tekhnicheskie nauki. 2017. No. 11-1. pp. 271–277.
27. Mikhaylenko F. P., Shcherbakov D. A. Understanding the stress-strain state and specific loads when upsetting workpieces made of aluminium alloys using torsion or without it. Forging and Stamping Production. 2008. No. 10. pp. 3–13.
28. Valiev R. Z., Mulyukov R. R., Ovchinnikov V. V. Direction of grain boundary phase in submicrometre-grained iron. Philosophical Magazine Letters. 1990. Vol. 62. pp. 253–256.
29. Champion Y., Couzinie J. P., Nenez S. T., Brechet Y., Islamgaliev R. K., Valiev R. Z. High strength and electrical conductivity of UFG copper alloys. Materials Science Forum. 2011. Vol. 667–669. pp. 755–760.

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