Joining of Titanium and its Alloys with Aluminum Alloys by Friction Stir Welding

Abstract:

This article is devoted to the study of the mechanism of formation of dissimilar welded joints Ti-2Al-1.5Mn, pure titanium (Ti35A) and aluminum (Аl (pure), Аl-6Mg-0.5Mn) alloys obtained by friction stir welding (FSW). The investigated microstructure of the weld joint nugget (WN), zones of thermo mechanically affected zone (TMAZ) and heat affected zone (HAZ) formed at FSW between Ti-2Al-1.5Mn, Ti35A and aluminum (Аl (pure), Аl-6Mg-0.5Mn) alloys. Zones of welded joints at FSW are formed in the mode of structural superplasticity (SP) with a specific shear-band layered structure with alternating layers. The achievement of superplastic state (SPS) in the formation of WN, TMAZ, HAZ is provided by the step–by–step transformation of various mechanisms of plastic deformation in the mode of simple, collective, abnormal dynamic recrystallization, prepared by the processes of dynamic return, polygonization with the transition to post-dynamic recrystallization by the mechanisms of Bailey–Hirsch, Kahn-Burgers-Taylor. At FSW aluminum and titanium alloys with polymorphism, SPS is supported additionally due to recrystallization by twinning and as a result of phase transformations of alpha-gamma or alpha-beta phases.

• Periodical: Key Engineering Materials (Volume 822)
• Pages: 109-116
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.822.109
• Online since: September 2019
• Authors: Radmir Rzaev*, Alexander Chularis, Aleksey Rybakov
• Keywords: Dissimilar Joints, Friction Stir Welding, Hardness, Solid Phase Welding, Superplasticity

References

[1] Panchenko O.V., Ivanov S.Y., Naumov A.A., Isupov F.Y., Popovich A.A. Local Mechanical Properties Estimation of Friction Stir Welded Al-Mg-Si Joints. Proceedings of the International Offshore and Polar Engineering Conference, 2018, 172-174.

DOI: 10.7449/2018/mst_2018_867_874

[2] Krylov N.A., Skotnikova M.A., Tsvetkova G.V., Ivanova G.V. Resistance to erosive destruction of steam turbine blades from titanium alloys, their structure and phase composition. Materials Physics and Mechanics. 2018 Jan 1; 39(1): pp.128-34.

DOI: 10.5862/jest.249.10

[3] Naumov A.A., Chernikov E.V., Isupov F.I., Panchenko O.V. Friction stir welding of dissimilar in thickness Al-5Mg alloy butt joints.

DOI: 10.7449/2017/mst_2017_971_977

[4] Rudskoy A.I., Naumov A.A., Chernikov E.V. Friction stir processing of metals is a new method of intensive plastic deformation, Tsvetnye Metally 4 (2014) 36-40.

[5] Chularis A.A. The Method of assessing the weldability of dissimilar materials. Welding production: Collection of works of young scientists. Rostov-on-don: RIC DSTU. 2015. pp.25-28.

[6] Makarov E.S., Gvozdev A.E., Zhuravlev G.M., Sergeev A.N., Minaev I.V., Breki A.D., Malii D.V. Application of plasticity theory of dilating media to sealing processes of powders of metallic systems. Chebyshevskii Sbornik. 2017;18(4): pp.269-285.

[7] Shorshorov M.Kh. A.E. Gvozdev, I.V. Tikhonova Calculation of the activation energy of the processes of superplastic deformation of steels and alloys under uniaxial tension. Izv. TulGU. ser. Materialovedeniye, vol. 2, 2002, p.222– 226.

[8] Naumov A.A., Isupov F.Y., Panchenko O.V., Rylkov E.N. Dissimilar welding of Cu and Al alloys by friction stir welding and impulse friction stir welding. Proceedings of the International Offshore and Polar Engineering Conference, 2018, 166-171.

DOI: 10.1201/9781315116815-4

[9] Turichin G., Tsibulsky I., Somonov V., Kuznetsov M., Akhmetov A. Laser-TIG welding of titanium alloys. InIOP Conference Series: Materials Science and Engineering 2016 Aug (Vol. 142, No. 1, p.012009). IOP Publishing.

DOI: 10.1088/1757-899x/142/1/012009

[10] Baryshnikova M.V., Filatov L.A., Petrov A.S., Alexandrov S.E. CVD Deposited titania thin films for gas sensors with improved operating characteristics. Chemical Vapor Deposition. 2015 Dec;21(10-11-12): pp.327-333.

DOI: 10.1002/cvde.201507187

[11] Imayev V., Gaisin R., Rudskoy A., Nazarova T., Shaimardanov R., Imayev R. Extraordinary superplastic properties of hot worked Ti–45Al–8Nb–0.2 C alloy. Journal of Alloys and Compounds. 2016 Apr 5;663: pp.217-224.

DOI: 10.1016/j.jallcom.2015.11.228

[12] Nesterova E.V., Rybin V.V. Mechanical twinning and fragmentation of technically pure titanium at the stage of developed plastic deformation. FMM, 1985, Vol. 59(2) pp.396-406.

[13] Kolobov Yu.R., Valiyev R.Z., Grabovetskaya G.P. Grain-boundary diffusion and properties of nanostructured materials. Novosibirsk: Nauka, 2001, p.21.

[14] Naumov A.A., Isupov F.Y., Panchenko O.V., Rylkov E.N. Finite element simulation of temperature field during FSW of dissimilar Al-Cu joint. Materials Science and Technology 2018, MS and T 2018, 2019, 875-881.

DOI: 10.7449/2018/mst_2018_875_881

[15] Smirnov O.M. Superplasticity of nanocrystalline and amorphous materials. Promising materials, 2010, p.228– 241.

[16] Skotnikova MA, Ivanova GV, Popov AA, Paitova OV. Localization of Plastic Deformation HCP—Crystals During Indentation and Scratching. InAdvances in Mechanical Engineering 2018, pp.143-150. Springer, Cham.

DOI: 10.1007/978-3-319-72929-9_15

[17] Dudarev E.F. Pochivalova G.P., Kolobov Yu.R. Microplastic deformation of submicrocrystalline titanium at room and elevated temperatures. Izv. vyssh. zaved. Fizika, 2012, vol. 55(7), pp.88-96.

DOI: 10.1007/s11182-012-9886-2

[18] Kaibyshev R., Malopheyev S. Mechanismus of dynamic recrystallization in alumininum alloys. Material Science Forum, 2014, v. 794- 796, p.784– 789.

DOI: 10.4028/www.scientific.net/msf.794-796.784

[19] Galeyev R.M., Valiakhmetov O.R., Salishchev G.A. Dynamic recrystallization of coarse-grained titanium alloy VT30 in the (α + β) field. Metals, 1990, No4, p.97– 103.