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Materials 2019, 12(3), 426; https://doi.org/10.3390/ma12030426

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

1
Institute of Solid State Physics and Chernogolovka Scientific Center, Russian Academy of Sciences, Chernogolovka 142432, Russia
2
Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, 76344 Eggenstein-Leopoldshafen, Germany
3
National University of Science and Technology «MISIS», Moscow 119049, Russia
4
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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Abstract

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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