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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.
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[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.
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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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Abstract

The paper presents the results of tests concerning the effect of the extrusion process in the complex strain state on the microstructure and properties of one of magnesium alloy with aluminium, zinc and manganese, designated AZ61. Due to its specific gravity, it is increasingly being used in the automotive and aerospace industries to reduce the weight of structural elements. As a result of plastic deformation processes, rods with a diameter of 8, 6 and 4 mm were obtained from AZ61 magnesium alloy. The microstructure analysis was performed using light and electron microscopy (STEM) techniques in the initial state and after plastic deformation. Microstructure studies were supplemented with a quantitative analysis using the Metilo program. A number of stereological parameters were determined: average diameter of grain, shape factor. A static tensile test was carried out at 250ºC and 300ºC, at deformation rates of 0.01, 0.001 and 0.0001 m·s–1. Better plastic properties after deformation using KoBo method were obtained than with conventional extrusion.

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Authors and Affiliations

Iwona Bednarczyk
ORCID: ORCID
D. Kuc
A. Tomaszewska
M. Tkocz

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