Investigation of the Role of Intermetallic Phases in Microstructure of UFG Titanium VT8M-1 Alloy

Abstract:

The paper studies the microstructure of two-phase ultrafine-grained titanium VT8M-1 alloy (Ti-5.7Al-3.8Mo-1.2Zr-1.3Sn), which was obtained by rotary swaging (RS). Parameters of the microstructure and the change of the phase elemental / chemical composition were investigated by scanning electron microscopy and transmission electronic microscopy. It was shown that the silicide particles like S₂ - (Ti,Zr)₆Si₃ were precipitated in the process of rotary swaging_. The influence of silicide precipitations on the characteristics of high temperature strength of the ultrafine-grained two-phase titanium VT8M-1 alloy was discussed in the paper. The alloy microstructure was analyzed after the creep-rupture tests in the operation temperature range 300-400^oС.

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 1659-1663
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.1659
• Online since: January 2021
• Authors: Tatyana Vitalyevna Yakovleva*, Grigory Dyakonov, Andrey Stotskiy, Iuliia Mikhailovna Modina, Irina P. Semenova
• Keywords: Creep Behavior, Intermetallic Compounds, Titanium Alloys, Ultrafine-Grained Structure

References

[1] V.M. Il'enko, R.E. Shalin, Titanovye splavy dlja aviacionnyh gazoturbinnyh dvigatelej [Titanium alloys for aircraft gas turbine engines], Titan. 1–2 (1995) 25 (in Russian).

[2] R.Z. Valiev, Nanostructuring of metals by severe plastic deformation for advanced properties, Nature Materials. 3 (2004) 511-516.

DOI: 10.1038/nmat1180

[3] Iu. M. Modina, A.V. Polyakov, G.S. Dyakonov, T.V. Yakovleva, A.G. Raab, I.P. Semenova, Peculiarities of microstructure and mechanical behavior of VT8M-1 alloy processed rotary swaging, IOP Conf. Series: Materials Science and Engineering. 461 (2019) 1-6.

DOI: 10.1088/1757-899x/461/1/012056

[4] A.A. Popov, M.O. Leder, M.A. Popova, N.G. Rossina, I.V. Narygina, Effect of alloying on precipitation of intermetallic phases in heat-resistant titanium alloys, The physics of metals and metallography. 116 (2015) 261-266.

DOI: 10.1134/s0031918x15030102

[5] A. Popov, M.A. Zhilyakova, O. Elkina, K.I. Lugovaya, The Precipitation of Silicide Particles in Heat-Resistant Titanium Alloys, in: S. Syngellakis, J. J. Connor (Eds.), Advanced Methods and Technologies in Metallurgy in Russia, Springer International Publishing AG, Switzerland, 2018, pp.19-25.

DOI: 10.1007/978-3-319-66354-8_3

[6] A.G. Stotskiy, A.V. Polyakov, G.S. Dyakonov, I.P. Semenova, Thermal Stability of Titanium Alloy VT8M-1 with Ultrafine-Grained Structure, Matec Web of Conferences, The 14th World Conf. on Titanium (Nantes).

DOI: 10.1051/matecconf/202032111026

[7] R.Z. Valiev, I.V. Alexandrov, N.A. Enikeev, M.Yu. Murashkin, I.P. Semenova, Towards enhancement of properties of ufg metals and alloys by grain boundary engineering using spd processing, Review on Advanced Materials Science. 25 (2010) 1-10.

DOI: 10.4028/www.scientific.net/msf.667-669.665

[8] I.P. Semenova, G.H. Salimgareeva, G.Da Costa, W. Lefebvre, R.Z. Valiev, Enhanced strength and ductility of ultra-fine grained Ti processed by severe plastic deformation, Advanced Engeneering Materials. 12 (2010) 803-80.

DOI: 10.1002/adem.201000059

[9] W.-J. Zhang, X.-Y. Song, S.-X. Hui, W.-J. Ye, W.-Q. Wang, Phase precipitation behavior and tensile property of a Ti-Al-Sn-Zr-Mo-Nb-W-Si titanium alloy, Rare Metals. 37 (2018) 1064-1069.

DOI: 10.1007/s12598-015-0666-3

[10] C. Ramachandra, V. Singh, Silicide phases in some complex titanium alloys, Metallurgical Transactions. A23 (1992) 689–690.

DOI: 10.1007/bf02801186

[11] A. A. Popov, M. A. Popova, Isothermal diagrams of precipitation of silicide and aluminide phases in refracctory titanium alloys, Metal Science and Heat Treatment. 58 (2017) 662-666.

DOI: 10.1007/s11041-017-0075-3

[12] T. Wanga, B. Lia, Z. Wanga, Z. Niea, A microstructure with improved thermal stability and creep resistance in a novel near-alpha titanium alloy, Materials Science and Engineering A. 731 (2018) 12–20.

DOI: 10.1016/j.msea.2018.06.034

[13] A. A. Popov, N. A. Drozdova, Principles of alloying titanium-based two-phase high-temperature alloys, Physics of Metals and Metallography. 84 (1997) 407-412.