Characterization of magnesium LAE442 alloy microstructure after deformation process with the use of KoBo method

• Autorzy: Bednarczyk I.

Identyfikatory

DOI

10.15199/28.2018.2.2

Warianty tytułu

PL

Charakterystyka mikrostruktury stopu magnezu LAE442 po procesie odkształcenia metodą KoBo

• Języki publikacji: EN

Abstrakty

EN

At present, there is a growing demand of the aviation industry on the parts prepared from light alloys which are characterised with sufficient stiffness and resistance. The technology of plastic deformation of magnesium alloys is a huge challenge. Due to the low plasticity of those materials in room temperature the parameters of the process of plastic working must be a satisfying compromise between the cost and the quality of the products. Due to those facts, alternative methods of plastic deformation of magnesium alloys need to be found. Particularly promising results in terms of the improvement in the susceptibility to plastic deformation are brought by new ultra-light magnesium alloys containing lithium. With the introduction of lithium, the density of which is 0.535 g/cm3, into the chemical composition of alloy, a further decrease of weight of alloy is achieved but at the same time the resistance of the material decreases. The article presents the results of tests of plastic deformation of Mg–Li–RE magnesium alloys. Alloys for extrusion process were achieved with the method of vacuum melting and casting to graphite moulds. The materials for tests were cast slabs from magnesium alloys with symbols LAE442. Before the process of deformation the castings were subject to homogenization. The tests of extrusion were conducted in complex state of deformation with using KOBO method. An assessment was performed of the influence of deformation process parameters on the microstructure of tested alloy. An analysis of microstructure was conducted both in initial condition and condition after plastic deformation with the use of techniques of light and scanning transmission electron microscopy.

PL

Obecnie obserwuje się rosnące zapotrzebowanie przemysłu lotniczego na części wykonane ze stopów magnezu, które spełnią określone wymagania wytrzymałościowe. Jednak mała plastyczność stopów magnezu w temperaturze pokojowej powoduje, że są poszukiwane alternatywne sposoby kształtowania tej grupy materiałów. Szczególnie obiecujące w zakresie poprawy podatności do kształtowania plastycznego są nowe ultralekkie stopy magnezu zawierające w swoim składzie chemicznym lit. W artykule przedstawiono wyniki analizy mikrostruktury prętów otrzymanych ze stopu LAE442 po procesie odkształcenia metodą KoBo. Określono zmiany powstałe w mikrostrukturze stopu LAE442 po odkształceniu plastycznym metodą KoBo.

Słowa kluczowe

EN

magnesium Mg–Li–RE alloy; KoBo SPD method; microstructure; electron microscopy

PL

stopy magnezu Mg-Li-RE; metoda SPD KoBo; mikrostruktura; mikroskopia elektronowa

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2018
• Tom: Vol. 39, nr 2
• Strony: 56--60
• Opis fizyczny: Bibliogr. 14 poz., fig., tab.

Twórcy

autor

Bednarczyk I.

• Silesian University of Technology, Faculty of Materials Engineering and Metallurgy, Katowice

Bibliografia

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• [3] ASM Binary alloy phase diagrams. 1996 ASM International.
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• [9] Bochniak W.: Theoretical and practical aspects of plastic shaping of metals with the use of KoBo method. Publishing house of AGH, Kraków (2009).
• [10] Bochniak W., Korbel A., Ostachowski P., Ziółkiewicz S., Borowski J.: Extrusion of metals and alloys with the use of KoBo method. Plastic Processing of Metals XXIV 2 (2013) 83÷97.
• [11] Korbel A., Bochniak W., Borowski J., Błaż L., Ostachowski P., Łagoda M.: Anomalies in precipitation hardening process of 7075 aluminium alloy extruded by KOBO method. J. Mater. Process Tech. 216 (2015) 160÷168.
• [12] Witte F., Fischer J., Nellesen J., Vogt C., Vogt J., Donath T.: In vivo corrosion and corrosion protection of magnesium alloy LAE442. Acta Biomater. 6 (2010) 1792÷1799.
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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).