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1
Content available 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.
2
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.
3
Content available remote Ultralight magnesium-lithium alloys for plastic working
Białobrzeski A., Saja K.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 3
21-24
EN
Various chemical compositions of ultralight magnesium-lithium alloys were examined and metallographic studies of these alloys, designed for further plastic working, were carried out. The preliminary results of mechanical tests carried out on these alloys were presented, providing a set of comparative data with the results of mechanical tests carried out on the same alloys after plastic working.
4
Content available remote 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
Content available remote Experimental stand for melting and casting of ultralight Mg-Li alloys
Białobrzeski A., Saja K.
Archives of Foundry Engineering
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2011
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Vol. 11, iss. 3
17-20
EN
The article presents the design guidelines and technical implementation of an experimental stand for melting and casting in controlled protective atmosphere the ultralight magnesium-lithium alloys, including also a small furnace for the heat treatment of such alloys. The manufacture and implementation of these devices provides a basis for studies on the preparation of ultra-light alloys for further plastic working.
6
Content available remote 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.
7
Acoustic emission during channel-die compression of Mg-Li and Mg-Li-Al alloys and composites reinforced by short δ Al2 O2 fibres
Pawełek A., Jasieński Z., Piątkowski A., Kudela S., Litwora A.
Archives of Metallurgy
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2002
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Vol. 47, iss. 2
175-183
EN
The paper presents preliminary results of the investigations of the correlations occurring between the acoustic (AE) events and the plastic deformation mechanisms during channel-die compression of Mg-Li and Mg-Li-Al alloys, as well as the corresponding metallic matrix composites reinforced with short δ Al2O2 fibres. Essential qualitative and quantitative differences in the AE behaviour have been observed in the composites and in the pure alloys. The obtained results are discussed on the basis of the possible dislocation and microcracking processes and also on the basis of microstructure observations using the optical microscopy. It is suggested that the highly jumping character of AE behaviour in two-phase Mg8Li3Al alloys is related to the twinning in phase and to the microcracking along the interfaces, while in Mg8Li+δAl2O3 composites also to the fibres cracking and debonding processes, i.e. the loss of cohesion between the fibres and the matrix.
PL
W pracy przedstawiono wstępne wyniki badań korelacji zachodzących pomiędzy tempem zdarzeń emisji akustycznej (EA) i mechanizmami odkształcenia plastycznego podczas nieswobodnego ściskania stopów Mg-Li i Mg-Li-Al oraz kompozytów na ich osnowie wzmocnionych krótkimi włóknami δ Al2O3. Zaobserwowano istotne różnice ilościowe i jakościowe w zachowaniu się EA zarówno w kompozytach jak i w czystych stopach. Otrzymane wyniki przedyskutowano w oparciu o możliwe procesy dyslokacyjne i procesy mikropękania jak również w oparciu o mikrostruktury obsewowane przy użyciu mikroskopii optycznej. Zasugerowano, że wysoce skokowy charakter przebiegu EA w stopach dwufazowych Mg8Li3Al jest związany z bliźniakowaniem w fazie i mikropękaniem wzdłuż granic międzyfazowych a w kompozytach Mg8Li+δAl2O3 także z procesami pękania włókien i debondingu, tj. dekohezji pomiedzy włóknami a osnową.
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