Obrabotka Metallov 2020 Vol. 22 No. 1

OBRABOTKAMETALLOV Vol. 22 No. 1 2020 87 MATERIAL SCIENCE Al 3 Ti Intermetallic Coatings obtained with Help Gas Dynamic Cold Spray and Heat Treatment Elena Kornienko 1, a,* , Anastasiya Vyalova 1, b , Vladislav Shikalov 2, c , Vladimir Kosarev 2, d , Tamila Vidyuk 2, e 1 Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation 2 Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya str., Novosibirsk, 630090, Russian Federation a http://orcid.org/0000-0002-5874-5422, kornienkoee@gmail.com, b https://orcid.org/0000-0003-2304-1166 , nastya13-29.98@mail.ru, c http://orcid.org/0000-0002-0491-2803, v.shikalov@gmail.com , d https://orcid.org/0000-0001-8989-9646 , vkos@itam.nsc.ru , e http://orcid.org/0000-0002-6819-8290, vidyuk@itam.nsc.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2020 vol. 22 no. 1 pp. 80–89 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2020-22.1-80-89 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 18 November 2019 Revised: 16 December 2019 Accepted: 20 January 2020 Available online: 15 March 2020 Keywords : Gas dynamic cold spray Heat treatment Coating Intermetallic Titanium aluminide Ti-Al TiAl 3 Funding The research was partly carried out within the framework of the Pro- gram of Fundamental Scienti fi c Re- search of the State Academies of Sciences in 2013-2020 (project No. АААА - А 19-119051590004-5) Acknowledgements The research was conducted at NSTU Materials Research Center and with using the equipment of the Joint Access Center “Mechanics” of ITAM SB RAS. ABSTRACT Introduction. Titanium alloys are widely used in aerospace, marine and biomedical industries due to its high strength-to-weight ratio and corrosion resistance. Unfortunately, these alloys are also characterized by low oxidation resistance and low wear resistance. An effective solution of this problem is the formation of wear-resistant and heat-resistant coatings on the surface of titanium workpieces. The work purpose is to investigate the in fl uence of heat treatment parameters on the formation of titanium aluminide from Ti-Al duplex coatings obtained by gas dynamic cold spray. Materials and methods. Al 3 Ti intermetallic coatings were formed on plates made of titanium alloy (Ti – base, Al < 2.5 %, Mn < 1.5 %). A layer of titanium powder (Ti – base, N < 0.08 %, C <0.05 %, H < 0.4 %, Fe + Ni < 0.4 %, Si < 0.1 %, Cl < 0.004 %) and a layer of aluminum powder (Al > 99.7 %) were applied on the substrate using the technology of gas dynamic cold spray. The thickness of each layer was ~ 100 μ m. Then the samples with coatings were heated in different regimes (heat temperature was 630, 640, 650, and 660 °C; time holding was 20, 120, and 300 min; cooling medium was air). Structural and phase studies of coatings were carried out with using light microscopy, scanning electron microscopy, and X-ray phase analysis. The results of microhardness measurements are presented. Results. It is established that the intermetallic layer formed at the interface between the titanium and aluminum layers is Al 3 Ti. The microhardness level of the intermetallic layer is ~ 600 HV. It is showed that the Al 3 Ti layer thickness varies depending on the heat treatment regimes. The maximum thickness (98.5 μ m) of intermetallic layer is observed after heating up to 650 °C and holding during 5 hours. It is established that an increase in the holding time has a greater effect on the increase in the thickness of the Al 3 Ti than an increase in temperature. For citation: Kornienko E.E., Vyalova A.D., Shikalov V.S., Kosarev V.F., Vidyuk T.M. Al 3 Ti Intermetallic Coatings obtained with Help Gas Dynamic Cold Spray and Heat Treatment. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2020, vol. 22, no. 1, pp. 80–89. DOI: 10.17212/1994-6309-2020-22.1-80-89. (In Russian). ______ * Corresponding author Kornienko Elena E. , Ph.D. (Engineering), Associate Professor Novosibirsk State Technical University, 20 Prospekt K. Marksa, 630073, Novosibirsk, Russian Federation Tel.: 8 (383) 346-11-71, e-mail: kornienkoee@gmail.com