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Plastyczność i mikrostruktura stopów Mg-Li

100%

Hadasik E. , Kuc D. , Mikuszewski T.

tom Vol. 78, nr 8

617--621

W artykule zaprezentowano wyniki badań dotyczących wpływu parametrów odkształcenia na podatność do plastycznego kształtowania stopów magnezu z litem, o zawartości litu 2,5; 4,5; 7,5 i 15 % masy. Badania plastyczności prowadzono w próbie ściskania w temperaturze otoczenia i temperaturze od 100 do 300 °C i prędkości odkształcenia 1 s-1. Przeprowadzone badania pozwoliły na określenie podatności stopów magnezu o różnej zawartości litu do kształtowania plastycznego. Przedstawiono wyniki wpływu temperatury odkształcania na mikrostrukturę badanych stopów.

In the article results of the influence of deformation parameters on the deformability to plastic forming for Mg-Li alloys type with contents of 2.5, 4.5, 7.5 and 15 mass % have been presented. Research were conduced as dynamic forming tests at elevated temperature. Hot torsion test was performed in compression tests at the temperature range from RT to 300 ºC and strain rate of 0.1 s-1. This research admit to determine the deformability of magnesium alloys with various contents of lithium to plastic forming. The influence of deformation temperature on microstructure changes in research alloys have been studied.

Registration of melting and crystallization process of ultra-light weight MgLi12,5 alloy with use of ATND method

84%

Białobrzeski A. , Pezda J.

Archives of Foundry Engineering

2012

tom Vol. 12, iss. 2

143-146

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.