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



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



Materials 12(3)



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 80-85%, 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.

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Accession: 066446248

Download citation: RISBibTeXText

PMID: 30704123

DOI: 10.3390/ma12030426


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