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Abstract

The article focuses on the analysis of the effect of Zr on the properties of the aluminium alloy AlSi9Cu1Mg. The effect of Zr was evaluated depending on the change in mechanical properties and heat resistance during a gradual addition of Zr with an increase of 0.05 wt. % Zr. Half of the cast experimental samples from each variant were heat treated by precipitation hardening T6 (hereinafter HT). The measured values in both states indicate an improvement of the mechanical properties, especially in the experimental variants with a content of Zr ≥ 0.20 wt. %. In the evaluation of Rm, the most significant improvement occurred in the experimental variant with an addition of Zr 0.25 wt. % after HT and E in the experimental variant with addition of Zr 0.20 wt. % after HT. Thus, a difference was found from the results of the authors defining the positive effect of Zr, in particular at 0.15 wt. %. When evaluating the microstructure of the AlSi9Cu1Mg alloy after Zr alloying, Zr phases are already eliminated with the addition of Zr 0.10 wt. %. Especially at higher levels of Zr ≥ 0.20 wt. %, long needle phases with slightly cleaved morphology are visible in the metal matrix. It can be stated that a negative manifestation of Zr alloying is expressed by an increase in gassing of experimental alloys, especially in variants with a content of Zr ≥ 0.15 wt. %. Experimental samples were cast into ceramic moulds. The development of an experimental alloy AlSi9Cu1Mg alloyed with Zr would allow the production of a more sophisticated material applicable to thin-walled Al castings capable of operating at higher temperature loads.

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Authors and Affiliations

M. Matejka
ORCID: ORCID
M. Kuriš
D. Bolibruchova
R. Pastirčák
ORCID: ORCID
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Abstract

The article focused primarily on comparing the achieved mechanical results for AlSi7Mg0.3Cu0.5Zr and AlSi7Mg0.3Cu0.5Zr0.15Ti experimental alloys. Experimental variants with the addition of Zr ≥ 0.05 wt. % demonstrated the ability of Zr to precipitate in the form of Al3Zr or AlSiZr intermetallic phases. Zr precipitated in the form of long smooth needles with split ends. When evaluating the thermal analyses, the repeated peak was observed already with the initial addition of Zr in the range of approximately 630 °C. It was interesting to observe the increased interaction with other intermetallic phases. EDX analysis confirmed that the individual phases are based on Cu, Mg but also Fe. Similar phenomena were observed in experimental alloys with a constant addition of Zr and a gradual increase in Ti by 0.1 wt. %. A significant change occurred in the amount of precipitated Zr phases. A more significant increase in mechanical properties after heat treatment of AlSi7Mg0.3Cu0.5Zr experimental alloys was observed mainly above the Zr content ≥ 0.15 wt. % Zr. The improvement of yield and tensile strength over the AlSi7Mg0.3Cu0.5 reference alloy after heat treatment was minimal, not exceeding 1 %. A more significant improvement after heat treatment occurred in modulus of elongation with an increase by 6 %, and in hardness with an increase by 7 %. The most significant drop occurred in ductility where a decrease by 31 % was observed compared to the reference alloy. AlSi7Mg0.3Cu0.5Zr0.15Ti experimental alloys, characterized by varying Ti content, achieved a more significant improvement. The improvement in tensile strength over the AlSi7Mg0.3Cu0.5 reference alloy after heat treatment was minimal, not exceeding 1 %. A more significant improvement after heat treatment occurred in modulus of elongation with an increase by 12 %, in hardness with an increase by 12 % and the most significant improvement occurred in yield strengthwith a value of 18 %. The most significant decrease also occurred in ductility where, compared to the reference alloy, the ductility drop was by up to 67 %.
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Bibliography

[1] Vončina, M., Medved, J., Kores, S., Xie, P., Cziegler, A. & Schumacher, P. (2018). Effect of molybdenum an zirconium on aluminium casting alloys. Livarski Vestnik. 68-78.
[2] Medved, J. & Kores, M.V.S. (2018). Development of innovative Al-Si-Mn-Mg alloys with hight mechanical properties. The Minerals, Metals & Materials Society. 373-380. DOI 10.1007/978-3-319-72284-9_50.
[3] Pisarek, B.P., Rapiejko, C., Szymczak, T. & Payniak, T. (2017). Effect of Alloy Additions on the Structure and Mechanical Properties of the AlSi7Mg0.3 Alloy. Archives of Foundry Engineering. 17(1),137-142. ISSN: 1897-3310.
[4] Mahmudi, R., Sepehrband, P. & Ghasemi, H.M. (2006). Improve properties of A319 aluminium casting alloy modified with Zr. Materials Letters. 2606-2610. DOI: 10.1016/j.matlet.2006.01.046
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[6] Rakhmonov, J., Timelli, G. & Bonollo, F. (2017) Characterization of the solidification path and microstructure of secondary Al-7Si-3Cu-0,3Mg alloy with Zr, V and Ni additions. Material characterization. ISSN:1044-5803.
[7] Krajewski, W., Geer, A., Buraś, J., Piwowarski, G. & Krajewski, P. (2019). New developments of hight-zinc Al-Zn-Cu-Mn cast alloys. Materialstoday Proceedings. 306-311. DOI: 10.1016/j.matpr.2018.10.410.
[8] Hermandez-Sandoval, J., Samuel, A.M. & Vatierra, F.H. (2016). Thermal analysis for detection of Zr-rich phases in Al-Si-Cu-Mg 354-type alloys. Journal of metalcasting. ISSN 1939-5981.
[9] Bolibruchova, D., Kuriš, M., Matejka, M., Major Gabryś, K., Vicen, M., (2020) Effect of Ti on selected properties of AlSi7Mg0.3Cu0.5 alloy with constant addition of Zr. Archives of Metalurgy and Materials. 66(1), 65-72. DOI: 10.24425/amm.2021.134760.

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Authors and Affiliations

M. Kuriš
1
D. Bolibruchova
1
M. Matejka
1
ORCID: ORCID
E. Kantoríková
1
ORCID: ORCID

  1. University of Zilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Univerzitna 1, 010 26 Zilina, Slovak Republic

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