Abstract
The ω-phase formation in titanium of the VT1-00 grade upon deformation under pressure has been investigated by X-ray diffraction analysis and diffraction electron microscopy. The deformation was effected by two methods: shear under a pressure of 6 GPa in Bridgman anvils and high-strain-rate equal-channel angular pressing at a pressure of about 2 GPa. Upon deformation under a pressure of 6 GPa, the ω phase is formed as grains that are isolated or clustered into groups. Upon deformation at a pressure of 2 GPa, this phase arises in the form of nanosized particles that are orientationally related to the α phase. After deformation by shear under pressure using one revolution of the anvils, new grains of the α phase up to 2–3 μm in size have been detected. The grains are nearly free of dislocations and have wavy boundaries. The origin of these grains is tracealle the reverse ω → α phase transformation that takes place upon pressure release and occurs via the “normal” rather than martensitic mechanism, at the expense of migration of the inter-phase boundaries. Upon heating, the reverse ω → α transformation at 100°C does not yet begin, whereas at 220°C the transformation proceeds almost completely. A temperature distribution in the titanium sample upon shear under pressure at a rate of 0.3 rpm has been calculated; according to this distribution, the maximum temperature rise is 12 K.
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References
R. Z. Valiev and I. A. Aleksandrov, Nanostructured Materials Produced by Severe Plastic Deformation (Logos, Moscow, 2000) [in Russian].
V. M. Segal, V. I. Reznikov, A. E. Drobyshevskii, and V. I. Kopylov, “Plastic Treatment of Metals by Simple Shear,” Izv. Akad. Nauk SSSR, Met., No. 1, 115–123 (1981).
V. A. Zil’bershtein, G. I. Nosova, and E. I. Estrin, Alpha-Omega Transformation in Titanium and Zirconium,” Fiz. Met. Metalloved. 35(3), 584–589 (1973).
A. R. Kutsar, V. N. German, and G. I. Nosova, “α → ω Transformation in Titanium and Zirconium in Shock Waves,” Dokl. Akad. Nauk SSSR 213(1), 81–84 (1973).
A. N. Kiselev and A. A. Fal’kov, “Phase Transformation in Titanium in Shock Waves,” Fiz. Goreniya Vzryva, No. 1, 115–119 (1982).
E. Yu. Tonkov, High-Pressure Phase Transformations: A Handbook (Metallurgiya, Moscow, 1988; Gordon and Breach, Philadelphia, 1992), Vol. 2.
E. V. Shorokhov, I. N. Zhgilev, and R. Z. Valiev, “Technique for Dynamic Treatment of Materials,” RF Patent No. 2283717, (2006).
B. A. Kolachev, V. A. Livanov, and A. A. Bukhanova, Mechanical Properties of Titanium and Its Alloys (Metallurgiya, Moscow, 1974) [in Russian].
V. I. Zel’dovich, E. V. Shorokhov, N. Yu. Frolova, et al., “High-Strain-Rate Deformation of Titanium Using Dynamic Equal-Channel Angular Pressing,” Fiz. Met. Metalloved. 105(4), 431–437 (2008) [Phys. Met. Metallogr. 105 (4), 402–408 (2008)].
G. I. Nosova, Phase Transformations in Titanium Alloys (Metallurgiya, Moscow, 1968) [in Russian].
A. V. Dobromyslov, R. V. Churbaev, V. A. Elkin, and T. L. Trenogina, “Mechanical Alloying of Ti-Ni Alloys under High Pressure,” Scr. Mater. 41(9), 1015–1021 (1999).
R. K. Islamgaliev, V. V. Latysh, A. R. Kilmametov, et al. “New Development of HPT Processing to Produce Bulk Nanostructured Metals,” in Ultrafine Grained Materials IV, Ed. by Y. T. Zhu, T. G. Langdon, Z. Horita et al. (The Minerals, Metals and Materials Society, Warrendale, Pa., 2006), pp. 183–188.
E. A. Borisova, G. A. Bochvar, M. Ya. Brun, et al., Metallography of Titanium Alloys (Metallurgiya, Moscow, 1980) [in Russian].
A. V. Dobromyslov and N. I. Taluts, Structure of Zirconium and Its Alloys (Ural. Otd. Ross. Akad. Nauk, Ekaterinburg, 1997) [in Russian].
Yu. L. Al’shevskii, B. A. Kul’nitskii, Yu. S. Konyaev, and M. P. Usikov, “Structure Peculiarities of the ω Phase Arising in Titanium and Zirconium under High Pressure,” Fiz. Met. Metalloved. 58(4), 795–803 (1984).
V. I. Zel’dovich, E. V. Shorokhov, N. Yu. Frolova, et al., “Structure of Titanium Subjected to Dynamic Channel-Angular Pressing,” Fiz. Met. Metalloved. 108(2) 155–160 (2009) [Phys. Met. Metallogr. 108 (2), 147–152 (2009)].
M. P. Usikov and V. A. Zilbershtein, “The Orientation Relationship between the α- and ω-Phases of Titanium and Zirconium,” Phys. Status Solidi A 19(1), 53–58 (1973).
A. V. Dobromyslov, N. I. Taluts, K. M. Demchuk, and A. N. Martem’yanov, “Electron-Microscopic Study of the α → ω Transformation in Zirconium,” Fiz. Met. Metalloved. 57(1), 90–95 (1984).
L. E. Popova and A. A. Popov, Diagrams of Austenite Transformation in Steels and Beta-Solution in Titanium Alloys: A Handbook (Metallurgiya, Moscow, 1991) [in Russian].
V. P. Pilyugin, Candidate’s Dissertation in Mathematics and Physics (Ekaterinburg, 1993).
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Original Russian Text © V.I. Zel’dovich, N.Yu. Frolova, A.M. Patselov, V.M. Gundyrev, A.E. Kheifets, V.P. Pilyugin, 2010, published in Fizika Metallov i Metallovedenie, 2010, Vol. 109, No. 1, pp. 33–42.
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Zel’dovich, V.I., Frolova, N.Y., Patselov, A.M. et al. The ω-phase formation in titanium upon deformation under pressure. Phys. Metals Metallogr. 109, 30–38 (2010). https://doi.org/10.1134/S0031918X10010059
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DOI: https://doi.org/10.1134/S0031918X10010059