All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russia:

E. N. Kablov, General Director
V. V. Antipov, Head of Scientific-Research Department “Titanium, magnesium, berillium and aluminium alloys”
Yu. Yu. Klochkova, Leading Engineer of Laboratory “Aluminium deformed alloys”, e-mail: admin@viam.ru

The paper presents the main development directions of perspective aluminium-lithium alloys. The alloys of new generation with optimized chemical composition, manufacturing technologies and heat treatment of semiproducts, as well as aluminium fiberglass laminates on their basis are considered. The concept of the upper wing welded panel from high-strength aluminium-lithium alloy has been developed for implementation of the fundamental principle of contiguity of material, technology and construction. The fragments of the wing panel with high level of mechanical and corrosion properties have been manufactured using friction stir welding (FSW). Additional weight reduction of the aircraft in general is possible owing to usage of a hybrid construction based on metal and metalpolymeric materials. Aluminium fiberglass laminates are considered as the new class of constructional hybrid sheet materials characterized by high fracture toughness, lower density and high strength, in comparison with monolithic materials, due to their multilayer structure, construction and parameters of the initial components. The manufacturing technology has been developed, the comprehensive researches of prototype fragment of the hybrid panel of an airplane wing have been conducted. Usage of monolithic integral skin-stringer extrusions joined by FSW or hybrid laminated wing panels on the basis of aluminium-lithium alloys instead of monolithic panels from the alloy В95pchТ2 will provide increase of a bearing capacity of the construction by up to 20% and, at the same time, weight reduction of construction components by up to 15%. The R&D project is executed within implementation of “The strategic directions of development of the materials and their processing technologies for the period till 2030” on the complex scientific problems “Layered crack resistant, high-strength metalpolymeric materials” and “High-strength welded aluminium and aluminium-lithium alloys with lowered density and increased fracture toughness”).

1. Kablov E. N. Innovatsionnye razrabotki federal'nogo gosudarstvennogo unitarnogo predpriyatiya “VIAM” Gosudarstvennogo nauchnogo tsentra Rossiyskoy Federatsii po realizatsii “Strategicheskikh napravleniy razvitiya materialov i tekhnologiy ikh pererabotki na period do 2030 goda” (Innovation developments of All-Russian Scientific Research Institute of Aviation Materials for realization of “Strategic ways of development of materials and their processing technologies for the period till 2030”). Aviatsionnye materialy i tekhnologii = Aviation Materials and Technologies. 2015. No. 1 (34). pp. 3–33.
2. Kablov E. N. Materialy i khimicheskie tekhnologii dlya aviatsionnoy tekhniki (Materials and chemical technologies for aviation technics). Vestnik Rossiyskoy akademii nauk = Herald of the Russian Academy of Sciences. 2012. Vol. 82, No. 6. pp. 520–530.
3. Fridlyander I. N. Alyuminievye splavy s litiem i magniem (Aluminium alloys with lithium and magnesium). V knige “Sozdanie, issledovanie i primenenie alyuminievykh splavov : Izbrannye trudy k 100-letiyu so dnya rozhdeniya” (In the book “Creation, investigation and application of aluminium alloys : Selected proceedings to the 100-th anniversary”). 2013. pp. 133–138.
4. Oglodkov M. S., Khokhlatova L. B., Kolobnev N. I., Filatov A. A., Popova Yu. A. Perspektiva primeneniya plit iz vysokoprochnogo splava V-1461 ponizhennoy plotnosti v samoletnykh konstruktsiyakh (Prospect of application of slab materials made of reduced-density high-resistant alloy V-1461 (В-1461) in aircraft building). Vse materialy. Entsiklopedicheskiy spravochnik = Polymer Science. Series D. 2014. No. 2. pp. 16–22.
5. Lukin V. I., Ioda E. N., Panteleev M. D., Skupov A. A. Vliyanie termicheskoy obrabotki na kharakteristiki svarnykh soedineniy vysokoprochnykh alyuminiylitievykh splavov (Heat treatment influence on characteristics of welding joints of high-strength aluminum-lithium alloys). Trudy VIAM = Proceedings of VIAM. 2015. No. 4. Available at : http://viam-works.ru/plugins/content/journal/uploads/articles/pdf/801.pdf
6. Cross C. T., Loechel L. W., Braun G. F. Weldalite 049 Weld Development for aerospace tankage. Proceedings of the 6th International Al – Li Conference. 1991. GPK (FRG). pp. 1165–1170.
7. Prasad N. E., Gokhale A., Wanhill R. J. H. Aluminium-lithium alloys: processing, properties, and applications. 2013. 608 p.
8. Fridlyander I. N. Alyuminievye splavy v letatelnykh apparatakh v periody 1970–2000 i 2001–2015 godov (Aluminium alloys in flying machines in the periods of 1970–2000 and 2001–2015). Tekhnologiya legkikh splavov = Technology of Light Alloys. 2002. No. 4. pp. 12–17.
9. Bois-Brochu A., Tchitembo Goma F. A., Blais C., Larouche D., Gauvin R., Boselli J. Al–Li alloy 2099-T83 extrusions: static mechanical properties, microstructure and texture. Advanced Materials Research. 2012. Vol. 409. pp. 29–34.
10. Khokhlatova L. B., Lukin V. I., Kolobnev N. I., Ioda E. N., Bazeskin A. V., Koshkin V. V., Mezentseva E. A. Perspektivnyy alyuminievo-litievyy splav 1424 dlya svarnykh konstruktsiy izdeliy aviakosmicheskoy tekhniki (Perspective aluminium-lithium alloy 1424 for welded constructions of the aerospace hardware products). Svarochnoe proizvodstvo = Welding International. 2009. No. 3. pp. 7–10.
11. Aviatsionnye materialy : spravochnik v 12 tomakh (Aviation materials : collection in 12 volumes). Under the general editorship of E. N. Kablov. 7-th edition, revised and enlarged. Moscow : All-Russian Scientific Research Institute of Aviation Materials. 2009. Vol. 4, Part 1, Book 1. 170 p.
12. Lukin V. I., Ospennikova O. G., Ioda E. N., Panteleev M. D. Svarka alyuminievykh splavov v aviakosmicheskoy promyshlennosti (Welding of aluminium alloys in aviaspase industry). Svarka i diagnostika = Welding and diagnostics. 2013. No. 2. pp. 47–52.
13. Lukin V. I., Ioda E. N., Bazeskin A. V., Lavrenchuk V. P., Kotelnikova L. V., Oglodkov M. S. Povyshenie nadezhnosti svarnykh soedineniy iz vysokoprochnogo alyuminievo-litievogo splava V-1461 (Reliability improvement of the welded joints from the high-strength aluminium-lithium alloy V-1461 (B-1461)). Svarochnoe proizvodstvo = Welding International. 2010. No. 11. pp. 14–17.
14. Romanenko V. A., Klochkova Yu. Yu., Klochkov G. G., Burlyaeva I. P. Pressovannaya panel iz alyuminiy-litievogo splava V-1469 (Pressed panel made of aluminium-lithium alloy V-1469). Aviatsionnye materialy i tekhnologii = Aviation Materials and Technologies. 2015. No. 3
15. Vlot A. Glare history of the development of a new aircraft material. Dordercht : Kluwer Academic Publishers, 2001. 222 p.
16. Fibre Metal Laminates an introductions. Editors: A. Vlot, J. W. Gunnink. Kluwer Academic Publishers. 2001. 527 p.
17. Erasov V. S., Nuzhnyy G. A., Grinevich A. V., Terekhin A. L. Treshchinostoykost aviatsionnykh materialov v protsesse ispytaniya na ustalost (Crack growth resistance of aviation materials in fatigue testing). Trudy VIAM = Proceedings of VIAM. 2013. No. 10. p. 06.
18. Plokker M., Daverschot D., Beumler T. Hybrid structure solution for the A400M wing attachment frames. 25th ICAF Symposium. Rotterdam, 27–29 May 2009.
19. Roebroeks G. H. J. J., Hooijmeijer P. A., Kroon E. J., Heinimann M. B. The development of central. First International Conference on Damage Tolerance of Aircraft Structures. 2009.
20. Proektirovanie, konstruktsii i sistemy samoletov i vertoletov. Kniga 2. Samolety i vertolety. Tom IV-21. Mashinostroenie. Entsiklopediya v soroka tomakh (Design, constructions and systems of airplanes and helicopters. Book 2. Airplanes and helicopters. Volume IV-21. Mechanical Engineering Encyclopedia in 40 volumes). Moscow : Mashinostoroenie, 2004. pp. 226–252. (in Russian)
21. Serebrennikova N. Yu., Antipov V. V., Senatorova O. G., Erasov V. S., Kashirin V. V. Gibridnye sloistye krylevye materialy na baze alyuminiylitievykh splavov (Hybrid layer wing materials on the basis of aluminiumlithium alloys). Aviatsionnye materialy i tekhnologii = Aviation Materials and Technologies. 2016. No. 3.