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Abstract

To the main advantages of magnesium alloys belongs their low density, and just because of such property the alloys are used in aviation and rocket structures, and in all other applications, where mass of products have significant importance for conditions of their operation. To additional advantages of the magnesium alloys belongs good corrosion resistance, par with or even surpassing aluminum alloys. Magnesium is the lightest of all the engineering metals, having a density of 1.74 g/cm3 . It is 35% lighter than aluminum (2.7 g/cm3 ) and over four times lighter than steel (7.86 g/cm3 ). The Mg-Li alloys belong to a light-weight metallic structural materials having mass density of 1.35-1.65 g/cm3 , what means they are two times lighter than aluminum alloys. Such value of mass density means that density of these alloys is comparable with density of plastics used as structural materials, and therefore Mg–Li alloys belong to the lightest of all metal alloys. In the present paper are discussed melting and crystallization processes of ultra-light weight MgLi12,5 alloys recorded with use of ATND methods. Investigated magnesium alloy was produced in Krakow Foundry Research Institute on experimental stand to melting and casting of ultra-light weight alloys. Obtained test results in form of recorded curves from ATND methods have enabled determination of characteristic temperatures of phase transitions of the investigated alloy.

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Authors and Affiliations

A. Białobrzeski
J. Pezda
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Abstract

This paper presents the results of a study to determine the influence of casting parameters (cooling rate in the casting mould, casting temperature) on the primary structure of Mg-4%Li-1%Ca alloy ingots. The macro- and microstructure analysis of the Mg-4%Li-1%Ca alloy was performed using light and electron microscopy techniques. Microhardness measurements were made for the Mg-4%Li-1%Ca alloy and phase identification in the Mg-4%Li-1%Ca alloy was made using X-ray phase analysis.
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Bibliography

[1] Białobrzeski, A.& Saja, K. (2011). Experimental stand for melting and casting of ultralight Mg-Li alloys. Archives of Foundry Engineering. 11(3), 17-20.
[2] Bednarczyk, I., Kuc, D. & Mikuszewski, T.(2016). Microstructure and properties of Mg-Li-Re magnesium alloys.Hutnik-WH, 83(8), 321-323. (in Polish).
[3] Bin J. Heng-mei, Y. Rui-hong, L. & Liang, G. (2010). Grain refinement and plastic formability of Mg-14Li-1Al alloy.Transactions of Nonferrous Metals Society of China. 1, 503-507. DOI: 10.1016/s1003-6326(10)60527-4.
[4] Liu, X., Zhan, H., Gu, S., Qu, Z., Wu, R. & Zhang, M. (2011).Superplasticity in a two-phase Mg– 8Li–2Zn alloy processed by two-pass extrusion. Materials Science and Engineering A. 528(19-20), 6157-6162. https://doi.org/10.1016/j.msea.2011.04.073.
[5] Białobrzeski, A., Lech-Grega, M.& Żelechowski, J. (2010). Research on the structure of alloys based on magnesium and lithium with a two-phase α-β and single-phase ß structure.Prace Instytutu Odlewnictwa. L, 17-28. (in Polish).
[6] Zhou, Y., Bian, L., Chen, G. Wang, L. & Liang, W. (2015). Influence of Ca addition on microstructular evolution and mechanical properties of near-eutectic Mg-Li alloys by copper-mold suction casting. Journal of Alloys and Compounds. 664. 85-91. DOI:10.1016/j.jallcom.2015.12.198.
[7] Białobrzeski, A., Saja, K. & Hubner, K. (2007) Ultralightmagnesium-lithiumalloys. Archives of Foundry Engineering. 7(3), 11-16. ISSN(1897-3310).
[8] Jiang, B., Qiu, D., Zhang, M., Ding, P.& Gao, L. (2010). A new approach to grain refinement of an Mg-Li-Al cast alloy. Journal of Alloys and Compounds. 10(1-2), 96-98. DOI:10.1016/j.jallcom.2009.11.066.
[9] Grobner, J., Schmid-Fetzer, R., Pisch, A., Colinet, C., Pavlyuk, V.V., Dmytriv, G.S., Kevorkov, D.G. & Bodak, O.I. (2002). Phase equilibria, calorimetric study and thermodynamic modeling of Mg-Li-Ca alloys. Thermochimica Acta. 389(1-2), 85-94. DOI:10.1016/S0040-6031(01)00842-5.
[10] Song, G.S. &Kral, M.V. (2005) Characterization of cast Mg-Li-Ca alloys. Materials Characterization. (54)4-5, 279-286. DOI: 10.1016/j.matchar.2004.12.001.
[11] Cui, L. Sun, L.R., Zheng, Y. &Li, S. (2018). In vitro degradation and biocompatibility of Mg-Li-Ca alloys – the influence of Li content. Science China Materials, 61(4), 607-618.
[12] Zeng, R.C. Qi, W.C. & Cui, H.Z. (2015). In vitro corrosion of as-extruded Mg-Ca alloys – the influence of Ca concentration. Corrosion Science. 96. 23-31. DOI:10.1016/j.corsci.2015.03.018.
[13] Chang, T., Wang, J., Chu, Ch., Lee, S (2006). Mechanical properties and microstructures of various Mg–Li alloys.Materials Letters.60(27), 3272-3276. DOI 10.1016/j.matlet.2006.03.052.
[14] Li, T., Wu, S.D. Li, S.X. &Li, P.J. (2007).Microstructure evolution of Mg–14% Li–1% Al. alloy during the process of equal channel angular pressing.Materials Science and Engineering A. 460-461, 499-503.DOI10.1016/j.msea.2007.01.108.
[15] Jiang, B., Qiu, D., Zhang, M., Ding, P., Gao, L. (2010). A new approach to grain refinement of an Mg-Li-Al cast alloy. Journal of Alloys and Compounds.492(1-2), 95-98. DOI: 10.1016/j.jallcom.2009.11.066.
[16] Cui, L., Sun, L., Zeng, R., Zheng, Y., Li, S. (2017). In vitro degradation and biocompatibility of, Mg-Li-Ca alloys – the influence of Li content. Science China Materials 7/08, 1-12, DOI: 10.1007/s40843-017-9071-y.
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Authors and Affiliations

Iwona Bednarczyk
1
ORCID: ORCID

  1. Silesian University of Technology, Department of Materials Technology, 40-019 Katowice ul. Krasińskiego 8, Poland
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Abstract

The article presents the results of tests of plastic shaping of magnesium alloy Mg-Li. Magnesium alloy for an extrusion process was obtained with the method of vacuum smelting and casting into graphite moulds. The materials for tests were slabs cast from magnesium alloys with symbols: Mg-4%Li-1%Ca (LX41). Before the process of deformation the castings were subject to homogenization. Conventional extrusion tests were conducted in a complex state of deformation (KoBo method). An assessment was performed of the influence of the deformation process parameters on the structure and properties of the tested alloy. Results of mechanical tests were presented both for static compression test in room temperature. On the basis of the achieved tests results, the susceptibility to plastic working for the Mg-4%Li-1%Ca alloy was determined. An analysis of the microstructure was conducted both in the initial condition and after plastic deformation with the use of light and scanning microscopy techniques. The applied deformation methods allowed the determination of the influence of process parameters on changes in the microstructure and properties of the Mg-4%Li-1%Ca alloy.
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Authors and Affiliations

Iwona Bednarczyk
ORCID: ORCID

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