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Materials 2019, 12(3), 426;

Structural and Mechanical Properties of Ti–Co Alloys Treated by High Pressure Torsion

Institute of Solid State Physics and Chernogolovka Scientific Center, Russian Academy of Sciences, Chernogolovka 142432, Russia
Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, 76344 Eggenstein-Leopoldshafen, Germany
National University of Science and Technology «MISIS», Moscow 119049, Russia
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 30-059 Krakow, Poland
Author to whom correspondence should be addressed.
Received: 26 December 2018 / Revised: 20 January 2019 / Accepted: 25 January 2019 / Published: 30 January 2019
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The microstructure and properties of titanium-based alloys can be tailored using severe plastic deformation. The structure and microhardness of Ti–4 wt.% Co alloy have been studied after preliminary annealing and following high pressure torsion (HPT). The Ti–4 wt.% Co alloy has been annealed at 400, 500, and 600 °C, i.e., below the temperature of eutectoid transformation in the Ti–4 wt.% Co system. The amount of Co dissolved in α-Ti increased with increasing annealing temperature. HPT led to the transformation of α-Ti in ω-Ti. After HPT, the amount of ω-phase in the sample annealed at 400 °C was about 80­85%, i.e., higher than in pure titanium (about 40%). However, with increasing temperature of pre-annealing, the portion of ω-phase decreased (60–65% at 500 °C and about 5% at 600 °C). The microhardness of all investigated samples increased with increasing temperature of pre-annealing. View Full-Text
Keywords: titanium alloys; high pressure torsion; microhardness titanium alloys; high pressure torsion; microhardness

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Straumal, B.B.; Korneva, A.; Kilmametov, A.R.; Lityńska-Dobrzyńska, L.; Gornakova, A.S.; Chulist, R.; Karpov, M.I.; Zięba, P. Structural and Mechanical Properties of Ti–Co Alloys Treated by High Pressure Torsion. Materials 2019, 12, 426.

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