Al3Ti Intermetallic Coatings obtained with Help Gas Dynamic Cold Spray and Heat Treatment
- Authors: Elena K.E.1, Anastasia V.D.1, Vladislav S.S.1, Vladimir K.F.1, Tomila V.M.1
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Affiliations:
- Issue: Vol 22, No 1 (2020)
- Pages: 80-89
- Section: MATERIAL SCIENCE
- URL: https://journal-vniispk.ru/1994-6309/article/view/301975
- DOI: https://doi.org/10.17212/1994-6309-2020-22.1-80-89
- ID: 301975
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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 influence of heat treatment parameters on the formation of titanium aluminide from Ti-Al duplex coatings obtained by gas dynamic cold spray. Materials and methods. Al3Ti 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 μm. 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 Al3Ti. The microhardness level of the intermetallic layer is ~ 600 HV. It is showed that the Al3Ti layer thickness varies depending on the heat treatment regimes. The maximum thickness (98.5 μm) 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 Al3Ti than an increase in temperature.
Keywords
About the authors
K. E. Elena
Email: kornienkoee@gmail.com
Ph.D. (Engineering), Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation, kornienkoee@gmail.com
V. D. Anastasia
Email: nastya13-29.98@mail.ru
Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation, nastya13-29.98@mail.ru
S. S. Vladislav
Email: v.shikalov@gmail.com
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya str., Novosibirsk, 630090, Russian Federation, v.shikalov@gmail.com
K. F. Vladimir
Email: vkos@itam.nsc.ru
D.Sc. (Physics and Mathematics), Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya str., Novosibirsk, 630090, Russian Federation, vkos@itam.nsc.ru
V. M. Tomila
Email: vidyuk@itam.nsc.ru
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, 4/1 Institutskaya str., Novosibirsk, 630090, Russian Federation, vidyuk@itam.nsc.ru
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