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Effect of aluminium on microstructure, mechanical property and texture evolution of dual phase Mg-8Li alloy in different processing conditions

Pugazhendhi B. S., Kar A., Sinnaeruvadi K., Suwas S.

Archives of Civil and Mechanical Engineering

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2018

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Vol. 18, no. 4

1332--1344

EN

The present study investigates the possibility of enhancing the strength with ductility of dual-phase magnesium (Mg)-8 lithium (Li) alloy by the combination of alloying addition aluminium (Al) and suitable thermo-mechanical processing. Microstructural evolution, phase analysis and texture studies were performed for Mg-8Li-xAl (x = 0, 2,4 and 6) alloys with the help of scanning electron microscopy (SEM) and X-ray diffraction (XRD). It is understood from the texture studies that the addition of Al to the Mg-8Li alloys activates the non-basal slip at room temperature. In turn, it facilitates the recovery process, hence a substantial improvement in plastic deformation after annealing of the alloys is observed. This is attributed to non-basal slip activity at room temperature. The presence of fine intermetallic compounds in the annealed Mg-8Li-xAl (x = 4 and 6) alloys leads to the higher ultimate strength (193 ± 7 MPa and 267 ± 9 MPa) and ductility (20% and 17%), respectively.

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

Białobrzeski A., Pezda J.

Archives of Foundry Engineering

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2012

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Vol. 12, iss. 2

143-146

EN

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.

3

Plastyczność i mikrostruktura stopów Mg-Li

Hadasik E., Kuc D., Mikuszewski T.

Hutnik, Wiadomości Hutnicze

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2011

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Vol. 78, nr 8

617--621

PL

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.

EN

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.

4

Registration of melting and crystallization process of synthetic MgLi3,5 alloy with use of ATND method

Białobrzeski A., Pezda J.

Archives of Foundry Engineering

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2011

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Vol. 11, iss. 4

5-8

EN

Contemporary requirements, which face machinery components and structures effect in necessity of searching after, and implementation of a new materials having significant effect on improvement of product quality, minimization of its dimensions and mass, as well as assuring reliability in operational conditions. Magnesium alloys belong to the lightest metallic structural materials and hence, are very attractive in such applications as automotive and aerospace industries, among others. Furthermore, addition of lithium, that has density of 0,53 g/cm3, reduces density of the resulting Mg-Li alloys to the same level as polymeric materials. Therefore, Mg-Li alloys become an alternative material assuring low density, improved ductility and corrosion resistance. The paper presents an attempt of implementation of the ATND method to monitoring of crystallization process of synthetic MgLi3,5 alloy. Investigated magnesium alloys were produced in the Foundry Research Institute. Registration of melting and crystallization processes was made with use of the ATND method. Results of the preliminary tests are shown in a graphical form.

5

Registration of melting and crystallization process of MCMgLi8Ca5 alloy with use of ATND method

Pezda J.

Archives of Foundry Engineering

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2009

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Vol. 9, iss. 2

5-8

EN

Among lightweight metal alloys, magnesium is the lightest structural material with density of 1.74 g/cm3, having many attractive physical and mechanical properties combined with processing advantages. Therefore, it represents very attractive material for large amount of applications starting from automotive industry as the main user, up to other industry fields like sports, robotic electronics, armaments, and textile ones, or production of audio-video equipment. Furthermore, addition of lithium, that has density of 0,53 g/cm3, reduces density of the resulting Mg-Li alloys to the same level as polymeric materials. On metallic matrix of magnesium alloys with lithium are also manufactured composites reinforced with e.g. ceramic fiber, which are used as a lightweight and resistant structure materials. Therefore, Mg-Li alloys become an alternative material assuring low density, improved ductility and corrosion resistance. The paper presents an attempt of implementation of the ATND method to monitoring of crystallization process of MCMgLi8Ca5 alloys. Investigated magnesium alloys were produced in the Foundry Research Institute. Registration of melting and crystallization processes was made with use of the ATND method. Results of the preliminary tests are shown in a graphical form.