The Influence of Severe Plastic Deformation Process on Structure and Properties of AZ 31 Alloy after Selected Heat Treatment

Abstract:

The technology of structure refinement in materials with the aim of achieving substantial mechanical properties and maintaining the required plasticity level is becoming increasingly useful in industrial practice. Magnesium alloys are very progressive materials for utilization in practice thanks to their high strength-to-weight ratios (tensile strength/density). The presented paper analyses the effect of the input heat treatment of the AZ31 alloy on the change of structure and strength properties through the process of severe plastic deformation (SPD), which finds an increasing utilization, especially in the automotive and aviation industry. For the study of the influence of the SPD process (ECAP method) on the properties of the AZ31 alloy, two types of thermal treatment of the initial state of the structure were selected. The analysis of the structure of the AZ31 alloy was performed in the initial state without heat treatment and subsequently after heat treatment. In the next part, the influence of the number of passes on the strengthening curves was evaluated. Mechanical properties of the AZ31 alloy after ECAP were evaluated by hardness measurement and completed by structure analysis.

• Periodical: Solid State Phenomena (Volume 275)
• Pages: 134-146
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.275.134
• Online since: June 2018
• Authors: Stanislav Rusz*, Ondřej Hilšer, Stanislav Tylšar, Lubomír Čížek, Tomasz Tański, Wojciech Maziarz
• Keywords: Magnesium Alloy, Severe Plastic Deformation, TEM, Vickers Hardness

References

[1] E.F. Horst, B.L. Mordike: Magnesium Technology. Metallurgy, Design Data, Application, Springer-Verlag, Berlin Heidelberg, (2006).

[2] L. A. Dobrzański, T. Tański, L. Čížek, Z. Brytan: Structure and properties of magnesium cast alloys, Journal of Materials Processing Technology Vol. 192 – 193 (2007), p.567 – 574.

DOI: 10.1016/j.jmatprotec.2007.04.045

[3] R. Z. Valiev, T. G. Langdon: Principles of equal – channel angular pressing as a processing tool for grain refinement, Progress in Materials Science, Vol. 51 (2006), p.881 – 981.

DOI: 10.1016/j.pmatsci.2006.02.003

[4] F. Czerwinski: Magnesium alloys – Design and properties, In Tech, (2011).

[5] Y. Beygelzimer, V. Varyukhin, S. Synkov, D. Orlov: Useful properties of twist extrusion, Materials Science and Engineering: A Vol. 502 (2009), p.14 – 17.

DOI: 10.1016/j.msea.2007.12.055

[6] T. G. Langdon: The principles of grain refinement in equal channel angular pressing, Materials Science and Engineering: A Vol. 462 (2007), p.3 – 11.

DOI: 10.1016/j.msea.2006.02.473

[7] L. A. Dobrzański, T. Tański, L. Čížek, J. Madejski: The influence of heat treatment on the microstructure and properties of Mg – Al – Zn based alloys, Archives of Materials Science and Engineering Vol. 36/1 (2009), p.48 – 54.

[8] L.A. Dobrzański, T. Tański, L. Čížek, Influence of heat treatment on structure and mechanical property of the casting magnesium alloys. Proceedings of International Scientific Conference Contemporary Achievements in Mechanics, Manufacturing and Materials Science" CAM3S,2005, Gliwice-Zakopane, 2005, 6 ps. (elektronic medium CD).

[9] O. Hilšer, S. Rusz, W. Maziarz, J. Dutkiewicz, T. Tański, P. Snopiński, J. Džugan: Structure and properties of AZ31 magnesium alloy after combination of hot extrusion and ECAP, Acta Metallurgica Slovaca Vol. 23/3 (2017), p.222 – 228.

DOI: 10.12776/ams.v23i3.971

[10] L. Čížek, S. Rusz, O. Hilšer, R. Śliwa, D. Kuc, T. Tański, M. Tkocz: Microstructure and properties of selected magnesium – aluminium alloys prepared for SPD processing technology, Archives of Metallurgy and Materials Vol.62/4 (2017).

DOI: 10.1515/amm-2017-0348