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The increase of susceptibility to plastic forming of magnesium alloys may be achieved by lithium addition in the amount of up to 15 % of alloy mass. At the same time by introduction of lithium which has density of 535 kg/m3 a significant weight decrease of the alloy is achieved. A limitation here is significant decrease of resistance of the alloy. Also, smelting magnesium alloys with lithium is more difficult than other magnesium alloys due to intensive oxidation. It is only possible to conduct smelting in vacuum furnaces with application of overpressure of argon. Therefore, it is necessary to conduct tests which aim at exploration of phenomena which occur in microstructure of Mg-Li alloys during primary shaping in conditions of vacuum metallurgy and under the influence of plastic deformation in room temperature and in elevated temperature. The article presents the results of tests connected with influence of strain parameters on the susceptibility to plastic shaping of magnesium lithium alloys with lithium content of 4.0, 7.5% and 15% of mass. Plasticity tests were conducted in compression test from room temperature up to 400 °C with strain speed of 0.1s-1. Conducted tests allowed for determination of susceptibility of magnesium alloys with different lithium content to plastic shaping. The results were compared with typical alloy AZ31. The results of influence of deformation temperature on the microstructure of tested alloys are also presented in this paper.
Keywords: Magnesium-lithium alloys, hot deformation, plastometric test, microstructure© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.